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702 lines
34 KiB
C++
702 lines
34 KiB
C++
/**
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* Copyright (c) 2013, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file sqlite-extension-func.c
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*/
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#include "config.h"
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#include <stdio.h>
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#include <assert.h>
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#include "lnav_util.hh"
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#include "base/lnav_log.hh"
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#include "sqlite-extension-func.hh"
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using namespace std;
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sqlite_registration_func_t sqlite_registration_funcs[] = {
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common_extension_functions,
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state_extension_functions,
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string_extension_functions,
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network_extension_functions,
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fs_extension_functions,
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json_extension_functions,
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time_extension_functions,
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NULL
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};
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multimap<std::string, help_text *> sqlite_function_help;
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int register_sqlite_funcs(sqlite3 *db, sqlite_registration_func_t *reg_funcs)
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{
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int lpc;
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assert(db != nullptr);
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assert(reg_funcs != nullptr);
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for (lpc = 0; reg_funcs[lpc]; lpc++) {
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struct FuncDef *basic_funcs = nullptr;
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struct FuncDefAgg *agg_funcs = nullptr;
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int i;
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reg_funcs[lpc](&basic_funcs, &agg_funcs);
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for (i = 0; basic_funcs && basic_funcs[i].zName; i++) {
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struct FuncDef &fd = basic_funcs[i];
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//sqlite3CreateFunc
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/* LMH no error checking */
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sqlite3_create_function(db,
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basic_funcs[i].zName,
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basic_funcs[i].nArg,
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basic_funcs[i].eTextRep,
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(void *) &fd,
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basic_funcs[i].xFunc,
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nullptr,
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nullptr);
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if (fd.fd_help.ht_context != help_context_t::HC_NONE) {
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help_text &ht = fd.fd_help;
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sqlite_function_help.insert(make_pair(ht.ht_name, &ht));
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ht.index_tags();
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}
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}
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for (i = 0; agg_funcs && agg_funcs[i].zName; i++) {
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struct FuncDefAgg &fda = agg_funcs[i];
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//sqlite3CreateFunc
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sqlite3_create_function(db,
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agg_funcs[i].zName,
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agg_funcs[i].nArg,
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SQLITE_UTF8,
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(void *) &agg_funcs[i],
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0,
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agg_funcs[i].xStep,
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agg_funcs[i].xFinalize);
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if (fda.fda_help.ht_context != help_context_t::HC_NONE) {
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help_text &ht = fda.fda_help;
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sqlite_function_help.insert(make_pair(ht.ht_name, &ht));
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ht.index_tags();
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}
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}
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}
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static help_text builtin_funcs[] = {
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help_text("abs",
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"Return the absolute value of the argument")
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.sql_function()
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.with_parameter({"x", "The number to convert"})
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.with_tags({"math"})
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.with_example({"SELECT abs(-1)"}),
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help_text("changes",
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"The number of database rows that were changed, inserted, or deleted by the most recent statement.")
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.sql_function(),
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help_text("char",
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"Returns a string composed of characters having the given unicode code point values")
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.sql_function()
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.with_parameter(help_text("X", "The unicode code point values")
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.zero_or_more())
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.with_tags({"string"})
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.with_example({"SELECT char(0x48, 0x49)"}),
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help_text("coalesce",
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"Returns a copy of its first non-NULL argument, or NULL if all arguments are NULL")
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.sql_function()
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.with_parameter({"X", "A value to check for NULL-ness"})
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.with_parameter(help_text("Y", "A value to check for NULL-ness")
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.one_or_more())
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.with_example({"SELECT coalesce(null, 0, null)"}),
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help_text("glob",
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"Match a string against Unix glob pattern")
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.sql_function()
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.with_parameter({"pattern", "The glob pattern"})
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.with_parameter({"str", "The string to match"})
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.with_example({"SELECT glob('a*', 'abc')"}),
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help_text("hex",
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"Returns a string which is the upper-case hexadecimal rendering of the content of its argument.")
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.sql_function()
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.with_parameter({"X", "The blob to convert to hexadecimal"})
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.with_example({"SELECT hex('abc')"}),
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help_text("ifnull",
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"Returns a copy of its first non-NULL argument, or NULL if both arguments are NULL")
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.sql_function()
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.with_parameter({"X", "A value to check for NULL-ness"})
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.with_parameter({"Y", "A value to check for NULL-ness"})
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.with_example({"SELECT ifnull(null, 0)"}),
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help_text("instr",
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"Finds the first occurrence of the needle within the haystack and returns the number of prior characters plus 1, or 0 if Y is nowhere found within X")
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.sql_function()
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.with_parameter({"haystack", "The string to search within"})
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.with_parameter({"needle", "The string to look for in the haystack"})
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.with_tags({"string"})
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.with_example({"SELECT instr('abc', 'b')"}),
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help_text("last_insert_rowid",
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"Returns the ROWID of the last row insert from the database connection which invoked the function")
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.sql_function(),
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help_text("length",
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"Returns the number of characters (not bytes) in the given string prior to the first NUL character")
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.sql_function()
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.with_parameter({"str", "The string to determine the length of"})
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.with_tags({"string"})
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.with_example({"SELECT length('abc')"}),
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help_text("like",
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"Match a string against a pattern")
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.sql_function()
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.with_parameter({"pattern",
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"The pattern to match. "
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"A percent symbol (%) will match zero or more characters "
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"and an underscore (_) will match a single character."})
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.with_parameter({"str", "The string to match"})
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.with_parameter(help_text("escape",
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"The escape character that can be used to prefix a literal percent or underscore in the pattern.")
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.optional())
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.with_example({"SELECT like('%b%', 'aabcc')"})
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.with_example({"SELECT like('%b:%', 'aab%', ':')"}),
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help_text("likelihood",
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"Provides a hint to the query planner that the first argument is a boolean that is true with the given probability")
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.sql_function()
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.with_parameter({"value", "The boolean value to return"})
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.with_parameter({"probability", "A floating point constant between 0.0 and 1.0"}),
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help_text("likely",
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"Short-hand for likelihood(X,0.9375)")
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.sql_function()
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.with_parameter({"value", "The boolean value to return"}),
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help_text("load_extension",
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"Loads SQLite extensions out of the given shared library file using the given entry point.")
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.sql_function()
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.with_parameter({"path", "The path to the shared library containing the extension."})
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.with_parameter(help_text("entry-point", "")
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.optional()),
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help_text("lower",
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"Returns a copy of the given string with all ASCII characters converted to lower case.")
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.sql_function()
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.with_parameter({"str", "The string to convert."})
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.with_tags({"string"})
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.with_example({"SELECT lower('AbC')"}),
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help_text("ltrim",
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"Returns a string formed by removing any and all characters that appear in the second argument from the left side of the first.")
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.sql_function()
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.with_parameter({"str", "The string to trim characters from the left side"})
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.with_parameter(help_text("chars", "The characters to trim. Defaults to spaces.")
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.optional())
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.with_tags({"string"})
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.with_example({"SELECT ltrim(' abc')"})
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.with_example({"SELECT ltrim('aaaabbbc', 'ab')"}),
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help_text("max",
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"Returns the argument with the maximum value, or return NULL if any argument is NULL.")
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.sql_function()
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.with_parameter(help_text("X", "The numbers to find the maximum of. "
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"If only one argument is given, this function operates as an aggregate.")
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.one_or_more())
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.with_tags({"math"})
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.with_example({"SELECT max(2, 1, 3)"})
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.with_example({"SELECT max(status) FROM http_status_codes"}),
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help_text("min",
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"Returns the argument with the minimum value, or return NULL if any argument is NULL.")
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.sql_function()
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.with_parameter(help_text("X", "The numbers to find the minimum of. "
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"If only one argument is given, this function operates as an aggregate.")
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.one_or_more())
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.with_tags({"math"})
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.with_example({"SELECT min(2, 1, 3)"})
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.with_example({"SELECT min(status) FROM http_status_codes"}),
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help_text("nullif",
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"Returns its first argument if the arguments are different and NULL if the arguments are the same.")
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.sql_function()
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.with_parameter({"X", "The first argument to compare."})
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.with_parameter({"Y", "The argument to compare against the first."})
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.with_example({"SELECT nullif(1, 1)"})
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.with_example({"SELECT nullif(1, 2)"}),
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help_text("printf",
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"Returns a string with this functions arguments substituted into the given format. "
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"Substitution points are specified using percent (%) options, much like the standard C printf() function.")
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.sql_function()
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.with_parameter({"format", "The format of the string to return."})
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.with_parameter(help_text("X", "The argument to substitute at a given position in the format."))
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.with_tags({"string"})
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.with_example({"SELECT printf('Hello, %s!', 'World')"})
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.with_example({"SELECT printf('align: % 10s', 'small')"})
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.with_example({"SELECT printf('value: %05d', 11)"}),
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help_text("quote",
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"Returns the text of an SQL literal which is the value of its argument suitable for inclusion into an SQL statement.")
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.sql_function()
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.with_parameter({"X", "The string to quote."})
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.with_example({"SELECT quote('abc')"})
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.with_example({"SELECT quote('abc''123')"}),
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help_text("random",
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"Returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807.")
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.sql_function(),
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help_text("randomblob",
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"Return an N-byte blob containing pseudo-random bytes.")
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.sql_function()
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.with_parameter({"N", "The size of the blob in bytes."}),
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help_text("replace",
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"Returns a string formed by substituting the replacement string for every occurrence of the old string in the given string.")
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.sql_function()
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.with_parameter({"str", "The string to perform substitutions on."})
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.with_parameter({"old", "The string to be replaced."})
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.with_parameter({"replacement", "The string to replace any occurrences of the old string with."})
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.with_tags({"string"})
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.with_example({"SELECT replace('abc', 'x', 'z')"})
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.with_example({"SELECT replace('abc', 'a', 'z')"}),
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help_text("round",
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"Returns a floating-point value rounded to the given number of digits to the right of the decimal point.")
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.sql_function()
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.with_parameter({"num", "The value to round."})
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.with_parameter(help_text("digits", "The number of digits to the right of the decimal to round to.")
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.optional())
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.with_tags({"math"})
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.with_example({"SELECT round(123.456)"})
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.with_example({"SELECT round(123.456, 1)"})
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.with_example({"SELECT round(123.456, 5)"}),
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help_text("rtrim",
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"Returns a string formed by removing any and all characters that appear in the second argument from the right side of the first.")
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.sql_function()
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.with_parameter({"str", "The string to trim characters from the right side"})
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.with_parameter(help_text("chars", "The characters to trim. Defaults to spaces.")
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.optional())
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.with_tags({"string"})
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.with_example({"SELECT ltrim('abc ')"})
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.with_example({"SELECT ltrim('abbbbcccc', 'bc')"}),
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help_text("sqlite_compileoption_get",
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"Returns the N-th compile-time option used to build SQLite or NULL if N is out of range.")
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.sql_function()
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.with_parameter({"N", "The option number to get"}),
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help_text("sqlite_compileoption_used",
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"Returns true (1) or false (0) depending on whether or not that compile-time option was used during the build.")
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.sql_function()
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.with_parameter({"option", "The name of the compile-time option."})
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.with_example({"SELECT sqlite_compileoption_used('ENABLE_FTS3')"}),
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help_text("sqlite_source_id",
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"Returns a string that identifies the specific version of the source code that was used to build the SQLite library.")
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.sql_function(),
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help_text("sqlite_version",
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"Returns the version string for the SQLite library that is running.")
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.sql_function(),
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help_text("substr",
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"Returns a substring of input string X that begins with the Y-th character and which is Z characters long.")
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.sql_function()
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.with_parameter({"str", "The string to extract a substring from."})
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.with_parameter({"start", "The index within 'str' that is the start of the substring. "
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"Indexes begin at 1. "
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"A negative value means that the substring is found by counting from the right rather than the left. "})
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.with_parameter(help_text("size", "The size of the substring. "
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"If not given, then all characters through the end of the string are returned. "
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"If the value is negative, then the characters before the start are returned.")
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.optional())
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.with_tags({"string"})
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.with_example({"SELECT substr('abc', 2)"})
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.with_example({"SELECT substr('abc', 2, 1)"})
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.with_example({"SELECT substr('abc', -1)"})
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.with_example({"SELECT substr('abc', -1, -1)"}),
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help_text("total_changes",
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"Returns the number of row changes caused by INSERT, UPDATE or DELETE statements since the current database connection was opened.")
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.sql_function(),
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help_text("trim",
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"Returns a string formed by removing any and all characters that appear in the second argument from the left and right sides of the first.")
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.sql_function()
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.with_parameter({"str", "The string to trim characters from the left and right sides."})
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.with_parameter(help_text("chars", "The characters to trim. Defaults to spaces.")
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.optional())
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.with_tags({"string"})
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.with_example({"SELECT trim(' abc ')"})
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.with_example({"SELECT trim('-+abc+-', '-+')"}),
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help_text("typeof",
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"Returns a string that indicates the datatype of the expression X: \"null\", \"integer\", \"real\", \"text\", or \"blob\".")
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.sql_function()
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.with_parameter({"X", "The expression to check."})
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.with_example({"SELECT typeof(1)"})
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.with_example({"SELECT typeof('abc')"}),
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help_text("unicode",
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"Returns the numeric unicode code point corresponding to the first character of the string X.")
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.sql_function()
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.with_parameter({"X", "The string to examine."})
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.with_example({"SELECT unicode('abc')"}),
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help_text("unlikely",
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"Short-hand for likelihood(X, 0.0625)")
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.sql_function()
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.with_parameter({"value", "The boolean value to return"}),
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help_text("upper",
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"Returns a copy of the given string with all ASCII characters converted to upper case.")
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.sql_function()
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.with_parameter({"str", "The string to convert."})
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.with_tags({"string"})
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.with_example({"SELECT upper('aBc')"}),
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help_text("zeroblob",
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"Returns a BLOB consisting of N bytes of 0x00.")
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.sql_function()
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.with_parameter({"N", "The size of the BLOB."}),
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help_text("date",
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"Returns the date in this format: YYYY-MM-DD.")
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.sql_function()
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.with_parameter({"timestring", "The string to convert to a date."})
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.with_parameter(help_text("modifier", "A transformation that is applied to the value to the left.")
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.zero_or_more())
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.with_tags({"datetime"})
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.with_example({"SELECT date('2017-01-02T03:04:05')"})
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.with_example({"SELECT date('2017-01-02T03:04:05', '+1 day')"})
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.with_example({"SELECT date(1491341842, 'unixepoch')"}),
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help_text("time",
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"Returns the time in this format: HH:MM:SS.")
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.sql_function()
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.with_parameter({"timestring", "The string to convert to a time."})
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.with_parameter(help_text("modifier", "A transformation that is applied to the value to the left.")
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.zero_or_more())
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.with_tags({"datetime"})
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.with_example({"SELECT time('2017-01-02T03:04:05')"})
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.with_example({"SELECT time('2017-01-02T03:04:05', '+1 minute')"})
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.with_example({"SELECT time(1491341842, 'unixepoch')"}),
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help_text("datetime",
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"Returns the date and time in this format: YYYY-MM-DD HH:MM:SS.")
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.sql_function()
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.with_parameter({"timestring", "The string to convert to a date with time."})
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.with_parameter(help_text("modifier", "A transformation that is applied to the value to the left.")
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.zero_or_more())
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.with_tags({"datetime"})
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.with_example({"SELECT datetime('2017-01-02T03:04:05')"})
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.with_example({"SELECT datetime('2017-01-02T03:04:05', '+1 minute')"})
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.with_example({"SELECT datetime(1491341842, 'unixepoch')"}),
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help_text("julianday",
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"Returns the number of days since noon in Greenwich on November 24, 4714 B.C.")
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.sql_function()
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.with_parameter({"timestring", "The string to convert to a date with time."})
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.with_parameter(help_text("modifier", "A transformation that is applied to the value to the left.")
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.zero_or_more())
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.with_tags({"datetime"})
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.with_example({"SELECT julianday('2017-01-02T03:04:05')"})
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.with_example({"SELECT julianday('2017-01-02T03:04:05', '+1 minute')"})
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.with_example({"SELECT julianday(1491341842, 'unixepoch')"}),
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help_text("strftime",
|
|
"Returns the date formatted according to the format string specified as the first argument.")
|
|
.sql_function()
|
|
.with_parameter({"format", "A format string with substitutions similar to those found in the strftime() standard C library."})
|
|
.with_parameter({"timestring", "The string to convert to a date with time."})
|
|
.with_parameter(help_text("modifier", "A transformation that is applied to the value to the left.")
|
|
.zero_or_more())
|
|
.with_tags({"datetime"})
|
|
.with_example({"SELECT strftime('%Y', '2017-01-02T03:04:05')"})
|
|
.with_example({"SELECT strftime('The time is: %H%M%S', '2017-01-02T03:04:05', '+1 minute')"})
|
|
.with_example({"SELECT strftime('Julian day: %J', 1491341842, 'unixepoch')"}),
|
|
|
|
help_text("avg",
|
|
"Returns the average value of all non-NULL numbers within a group.")
|
|
.sql_function()
|
|
.with_parameter({"X", "The value to compute the average of."})
|
|
.with_tags({"math"})
|
|
.with_example({"SELECT avg(ex_duration) FROM lnav_example_log"})
|
|
.with_example({"SELECT ex_procname, avg(ex_duration) FROM lnav_example_log GROUP BY ex_procname"}),
|
|
|
|
help_text("count",
|
|
"If the argument is '*', the total number of rows in the group is returned. "
|
|
"Otherwise, the number of times the argument is non-NULL.")
|
|
.sql_function()
|
|
.with_parameter({"X", "The value to count."})
|
|
.with_example({"SELECT count(*) FROM lnav_example_log"})
|
|
.with_example({"SELECT count(log_part) FROM lnav_example_log"}),
|
|
|
|
help_text("group_concat",
|
|
"Returns a string which is the concatenation of all non-NULL values of X.")
|
|
.sql_function()
|
|
.with_parameter({"X", "The value to concatenate."})
|
|
.with_parameter(help_text("sep", "The separator to place between the values.")
|
|
.optional())
|
|
.with_tags({"string"})
|
|
.with_example({"SELECT group_concat(ex_procname) FROM lnav_example_log"})
|
|
.with_example({"SELECT group_concat(ex_procname, ', ') FROM lnav_example_log"})
|
|
.with_example({"SELECT group_concat(DISTINCT ex_procname) FROM lnav_example_log"}),
|
|
|
|
help_text("sum",
|
|
"Returns the sum of the values in the group as an integer.")
|
|
.sql_function()
|
|
.with_parameter({"X", "The values to add."})
|
|
.with_tags({"math"})
|
|
.with_example({"SELECT sum(ex_duration) FROM lnav_example_log"}),
|
|
|
|
help_text("total",
|
|
"Returns the sum of the values in the group as a floating-point.")
|
|
.sql_function()
|
|
.with_parameter({"X", "The values to add."})
|
|
.with_tags({"math"})
|
|
.with_example({"SELECT total(ex_duration) FROM lnav_example_log"}),
|
|
|
|
};
|
|
|
|
for (auto &ht : builtin_funcs) {
|
|
sqlite_function_help.insert(make_pair(ht.ht_name, &ht));
|
|
ht.index_tags();
|
|
}
|
|
|
|
static help_text idents[] = {
|
|
help_text("ATTACH",
|
|
"Attach a database file to the current connection.")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("filename", "The path to the database file.")
|
|
.with_flag_name("DATABASE"))
|
|
.with_parameter(help_text("schema-name", "The prefix for tables in this database.")
|
|
.with_flag_name("AS"))
|
|
.with_example({"ATTACH DATABASE '/tmp/customers.db' AS customers"}),
|
|
|
|
help_text("DETACH",
|
|
"Detach a database from the current connection.")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("schema-name", "The prefix for tables in this database.")
|
|
.with_flag_name("DATABASE"))
|
|
.with_example({"DETACH DATABASE customers"}),
|
|
|
|
help_text("CREATE", "Assign a name to a SELECT statement")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("TEMP")
|
|
.optional())
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("VIEW"))
|
|
.with_parameter(help_text("IF NOT EXISTS", "Do not create the view if it already exists")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.", "The database to create the view in")
|
|
.optional())
|
|
.with_parameter(help_text("view-name", "The name of the view"))
|
|
.with_parameter(help_text("select-stmt", "The SELECT statement the view represents")
|
|
.with_flag_name("AS")),
|
|
|
|
help_text("CREATE", "Create a table")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("TEMP").optional())
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("TABLE"))
|
|
.with_parameter(help_text("IF NOT EXISTS")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("table-name"))
|
|
.with_parameter(help_text("select-stmt")
|
|
.with_flag_name("AS")),
|
|
|
|
help_text("DELETE", "Delete rows from a table")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("table-name", "The name of the table")
|
|
.with_flag_name("FROM"))
|
|
.with_parameter(help_text("cond", "The conditions used to delete the rows.")
|
|
.with_flag_name("WHERE")
|
|
.optional())
|
|
.with_example({"SELECT * FROM syslog_log"}),
|
|
|
|
help_text("DROP", "Drop an index")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("INDEX"))
|
|
.with_parameter(help_text("IF EXISTS")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("index-name")),
|
|
|
|
help_text("DROP", "Drop a table")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("TABLE"))
|
|
.with_parameter(help_text("IF EXISTS")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("table-name")),
|
|
|
|
help_text("DROP", "Drop a view")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("VIEW"))
|
|
.with_parameter(help_text("IF EXISTS")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("view-name")),
|
|
|
|
help_text("DROP", "Drop a trigger")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("TRIGGER"))
|
|
.with_parameter(help_text("IF EXISTS")
|
|
.optional())
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("trigger-name")),
|
|
|
|
help_text("INSERT", "Insert rows into a table")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("INTO"))
|
|
.with_parameter(help_text("schema-name.")
|
|
.optional())
|
|
.with_parameter(help_text("table-name"))
|
|
.with_parameter(help_text("column-name")
|
|
.with_grouping("(", ")")
|
|
.zero_or_more())
|
|
.with_parameter(help_text("expr")
|
|
.with_flag_name("VALUES")
|
|
.with_grouping("(", ")")
|
|
.one_or_more())
|
|
.with_example({"INSERT INTO environ VALUES ('MSG', 'HELLO, WORLD!')"}),
|
|
|
|
help_text("SELECT",
|
|
"Query the database and return zero or more rows of data.")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("result-column", "")
|
|
.one_or_more())
|
|
.with_parameter(help_text("table", "The table(s) to query for data")
|
|
.with_flag_name("FROM")
|
|
.zero_or_more())
|
|
.with_parameter(help_text("cond", "The conditions used to select the rows to return.")
|
|
.with_flag_name("WHERE")
|
|
.optional())
|
|
.with_parameter(help_text("grouping-expr", "The expression to use when grouping rows.")
|
|
.with_flag_name("GROUP BY")
|
|
.zero_or_more())
|
|
.with_parameter(help_text("ordering-term", "The values to use when ordering the result set.")
|
|
.with_flag_name("ORDER BY")
|
|
.zero_or_more())
|
|
.with_parameter(help_text("limit-expr", "The maximum number of rows to return")
|
|
.with_flag_name("LIMIT")
|
|
.zero_or_more())
|
|
.with_example({"SELECT * FROM syslog_log"}),
|
|
|
|
help_text("WITH",
|
|
"Create a temporary view that exists only for the duration of a SQL statement.")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("", "")
|
|
.with_flag_name("RECURSIVE")
|
|
.optional())
|
|
.with_parameter({"cte-table-name", "The name for the temporary table."})
|
|
.with_parameter(help_text("select-stmt", "The SELECT statement used to populate the temporary table.")
|
|
.with_flag_name("AS")),
|
|
|
|
help_text("UPDATE",
|
|
"Modify a subset of values in zero or more rows of the given table")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("table", "The table to update"))
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("SET"))
|
|
.with_parameter(help_text("column-name", "The columns in the table to update.")
|
|
.with_parameter(help_text("expr", "The values to place into the column.")
|
|
.with_flag_name("="))
|
|
.one_or_more())
|
|
.with_parameter(help_text("cond", "The condition used to determine whether a row should be updated.")
|
|
.with_flag_name("WHERE")
|
|
.optional())
|
|
.with_example({"UPDATE syslog_log SET log_mark = 1 WHERE log_line = 40"}),
|
|
|
|
help_text("CASE",
|
|
"Evaluate a series of expressions in order until one evaluates to true and then return it's result. "
|
|
"Similar to an IF-THEN-ELSE construct in other languages.")
|
|
.sql_keyword()
|
|
.with_parameter(help_text("base-expr", "The base expression that is used for comparison in the branches")
|
|
.optional())
|
|
.with_parameter(help_text("cmp-expr", "The expression to test if this branch should be taken")
|
|
.with_flag_name("WHEN")
|
|
.one_or_more()
|
|
.with_parameter(help_text("then-expr", "The result for this branch.")
|
|
.with_flag_name("THEN")))
|
|
.with_parameter(help_text("else-expr", "The result of this CASE if no branches matched.")
|
|
.with_flag_name("ELSE")
|
|
.optional())
|
|
.with_parameter(help_text("")
|
|
.with_flag_name("END"))
|
|
.with_example({"SELECT CASE 1 WHEN 0 THEN 'zero' WHEN 1 THEN 'one' END"}),
|
|
|
|
help_text("CAST",
|
|
"Convert the value of the given expression to a different storage class specified by type-name.")
|
|
.sql_function()
|
|
.with_parameter({"expr", "The value to convert."})
|
|
.with_parameter(help_text("type-name", "The name of the type to convert to.")
|
|
.with_flag_name("AS"))
|
|
.with_example({"SELECT CAST(1.23 AS INTEGER)"}),
|
|
|
|
};
|
|
|
|
for (auto &ht : idents) {
|
|
sqlite_function_help.insert(make_pair(toupper(ht.ht_name), &ht));
|
|
for (const auto ¶m : ht.ht_parameters) {
|
|
if (!param.ht_flag_name) {
|
|
continue;
|
|
}
|
|
sqlite_function_help.insert(make_pair(toupper(param.ht_flag_name), &ht));
|
|
}
|
|
}
|
|
|
|
for (const auto &iter : sqlite_function_help) {
|
|
log_debug("help %s", iter.first.c_str());
|
|
}
|
|
|
|
return 0;
|
|
}
|