/* Copyright (C) 2005 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _my_plugin_h #define _my_plugin_h #ifdef __cplusplus class THD; class Item; #define MYSQL_THD THD* #else #define MYSQL_THD void* #endif /************************************************************************* Plugin API. Common for all plugin types. */ #define MYSQL_PLUGIN_INTERFACE_VERSION 0x0100 /* The allowable types of plugins */ #define MYSQL_UDF_PLUGIN 0 /* User-defined function */ #define MYSQL_STORAGE_ENGINE_PLUGIN 1 /* Storage Engine */ #define MYSQL_FTPARSER_PLUGIN 2 /* Full-text parser plugin */ #define MYSQL_DAEMON_PLUGIN 3 /* The daemon/raw plugin type */ #define MYSQL_INFORMATION_SCHEMA_PLUGIN 4 /* The I_S plugin type */ #define MYSQL_MAX_PLUGIN_TYPE_NUM 5 /* The number of plugin types */ /* We use the following strings to define licenses for plugins */ #define PLUGIN_LICENSE_PROPRIETARY 0 #define PLUGIN_LICENSE_GPL 1 #define PLUGIN_LICENSE_BSD 2 #define PLUGIN_LICENSE_PROPRIETARY_STRING "PROPRIETARY" #define PLUGIN_LICENSE_GPL_STRING "GPL" #define PLUGIN_LICENSE_BSD_STRING "BSD" /* Macros for beginning and ending plugin declarations. Between mysql_declare_plugin and mysql_declare_plugin_end there should be a st_mysql_plugin struct for each plugin to be declared. */ #ifndef MYSQL_DYNAMIC_PLUGIN #define __MYSQL_DECLARE_PLUGIN(NAME, VERSION, PSIZE, DECLS) \ int VERSION= MYSQL_PLUGIN_INTERFACE_VERSION; \ int PSIZE= sizeof(struct st_mysql_plugin); \ struct st_mysql_plugin DECLS[]= { #else #define __MYSQL_DECLARE_PLUGIN(NAME, VERSION, PSIZE, DECLS) \ int _mysql_plugin_interface_version_= MYSQL_PLUGIN_INTERFACE_VERSION; \ int _mysql_sizeof_struct_st_plugin_= sizeof(struct st_mysql_plugin); \ struct st_mysql_plugin _mysql_plugin_declarations_[]= { #endif #define mysql_declare_plugin(NAME) \ __MYSQL_DECLARE_PLUGIN(NAME, \ builtin_ ## NAME ## _plugin_interface_version, \ builtin_ ## NAME ## _sizeof_struct_st_plugin, \ builtin_ ## NAME ## _plugin) #define mysql_declare_plugin_end ,{0,0,0,0,0,0,0,0,0,0,0,0}} /* declarations for SHOW STATUS support in plugins */ enum enum_mysql_show_type { SHOW_UNDEF, SHOW_BOOL, SHOW_INT, SHOW_LONG, SHOW_LONGLONG, SHOW_CHAR, SHOW_CHAR_PTR, SHOW_ARRAY, SHOW_FUNC }; struct st_mysql_show_var { const char *name; char *value; enum enum_mysql_show_type type; }; #define SHOW_VAR_FUNC_BUFF_SIZE 1024 typedef int (*mysql_show_var_func)(MYSQL_THD, struct st_mysql_show_var*, char *); /* declarations for server variables and command line options */ #define PLUGIN_VAR_BOOL 0x0001 #define PLUGIN_VAR_INT 0x0002 #define PLUGIN_VAR_LONG 0x0003 #define PLUGIN_VAR_LONGLONG 0x0004 #define PLUGIN_VAR_STR 0x0005 #define PLUGIN_VAR_ENUM 0x0006 #define PLUGIN_VAR_SET 0x0007 #define PLUGIN_VAR_UNSIGNED 0x0080 #define PLUGIN_VAR_THDLOCAL 0x0100 /* Variable is per-connection */ #define PLUGIN_VAR_READONLY 0x0200 /* Server variable is read only */ #define PLUGIN_VAR_NOSYSVAR 0x0400 /* Not a server variable */ #define PLUGIN_VAR_NOCMDOPT 0x0800 /* Not a command line option */ #define PLUGIN_VAR_NOCMDARG 0x1000 /* No argument for cmd line */ #define PLUGIN_VAR_RQCMDARG 0x0000 /* Argument required for cmd line */ #define PLUGIN_VAR_OPCMDARG 0x2000 /* Argument optional for cmd line */ #define PLUGIN_VAR_MEMALLOC 0x8000 /* String needs memory allocated */ struct st_mysql_sys_var; struct st_mysql_value; /* SYNOPSIS (*mysql_var_check_func)() thd thread handle var dynamic variable being altered save pointer to temporary storage value user provided value RETURN 0 user provided value is OK and the update func may be called. any other value indicates error. This function should parse the user provided value and store in the provided temporary storage any data as required by the update func. There is sufficient space in the temporary storage to store a double. Note that the update func may not be called if any other error occurs so any memory allocated should be thread-local so that it may be freed automatically at the end of the statement. */ typedef int (*mysql_var_check_func)(MYSQL_THD thd, struct st_mysql_sys_var *var, void *save, struct st_mysql_value *value); /* SYNOPSIS (*mysql_var_update_func)() thd thread handle var dynamic variable being altered var_ptr pointer to dynamic variable save pointer to temporary storage RETURN NONE This function should use the validated value stored in the temporary store and persist it in the provided pointer to the dynamic variable. For example, strings may require memory to be allocated. */ typedef void (*mysql_var_update_func)(MYSQL_THD thd, struct st_mysql_sys_var *var, void *var_ptr, void *save); /* the following declarations are for internal use only */ #define PLUGIN_VAR_MASK \ (PLUGIN_VAR_READONLY | PLUGIN_VAR_NOSYSVAR | \ PLUGIN_VAR_NOCMDOPT | PLUGIN_VAR_NOCMDARG | \ PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC) #define MYSQL_PLUGIN_VAR_HEADER \ int flags; \ const char *name; \ const char *comment; \ mysql_var_check_func check; \ mysql_var_update_func update #define MYSQL_SYSVAR_NAME(name) mysql_sysvar_ ## name #define MYSQL_SYSVAR(name) \ ((struct st_mysql_sys_var *)&(MYSQL_SYSVAR_NAME(name))) /* for global variables, the value pointer is the first element after the header, the default value is the second. for thread variables, the value offset is the first element after the header, the default value is the second. */ #define DECLARE_MYSQL_SYSVAR_BASIC(name, type) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ type *value; type def_val; \ } MYSQL_SYSVAR_NAME(name) #define DECLARE_MYSQL_SYSVAR_SIMPLE(name, type) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ type *value; type def_val; \ type min_val; type max_val; \ type blk_sz; \ } MYSQL_SYSVAR_NAME(name) #define DECLARE_MYSQL_SYSVAR_TYPELIB(name) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ unsigned long *value, def_val;\ TYPELIB *typelib; \ } MYSQL_SYSVAR_NAME(name) #define DECLARE_THDVAR_FUNC(type) \ type *(*resolve)(MYSQL_THD thd, int offset) #define DECLARE_MYSQL_THDVAR_BASIC(name, type) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ int offset; \ type def_val; \ DECLARE_THDVAR_FUNC(type); \ } MYSQL_SYSVAR_NAME(name) #define DECLARE_MYSQL_THDVAR_SIMPLE(name, type) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ int offset; \ type def_val; type min_val; \ type max_val; type blk_sz; \ DECLARE_THDVAR_FUNC(type); \ } MYSQL_SYSVAR_NAME(name) #define DECLARE_MYSQL_THDVAR_TYPELIB(name) struct { \ MYSQL_PLUGIN_VAR_HEADER; \ int offset; \ unsigned long def_val; \ DECLARE_THDVAR_FUNC(unsigned long); \ TYPELIB *typelib; \ } MYSQL_SYSVAR_NAME(name) /* the following declarations are for use by plugin implementors */ #define MYSQL_SYSVAR_BOOL(name, varname, opt, comment, check, update, def) \ DECLARE_MYSQL_SYSVAR_BASIC(name, char) = { \ PLUGIN_VAR_BOOL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def} #define MYSQL_SYSVAR_STR(name, varname, opt, comment, check, update, def) \ DECLARE_MYSQL_SYSVAR_BASIC(name, char *) = { \ PLUGIN_VAR_STR | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def} #define MYSQL_SYSVAR_INT(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, int) = { \ PLUGIN_VAR_INT | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_UINT(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, unsigned int) = { \ PLUGIN_VAR_INT | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_LONG(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, long) = { \ PLUGIN_VAR_LONG | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_ULONG(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, unsigned long) = { \ PLUGIN_VAR_LONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_LONGLONG(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, longlong) = { \ PLUGIN_VAR_LONGLONG | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_ULONGLONG(name, varname, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_SYSVAR_SIMPLE(name, ulonglong) = { \ PLUGIN_VAR_LONGLONG | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, min, max, blk } #define MYSQL_SYSVAR_ENUM(name, varname, opt, comment, check, update, def, typelib) \ DECLARE_MYSQL_SYSVAR_TYPELIB(name) = { \ PLUGIN_VAR_ENUM | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, typelib } #define MYSQL_SYSVAR_SET(name, varname, opt, comment, check, update, def, typelib) \ DECLARE_MYSQL_SYSVAR_TYPELIB(name) = { \ PLUGIN_VAR_SET | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, &varname, def, typelib } #define MYSQL_THDVAR_BOOL(name, opt, comment, check, update, def) \ DECLARE_MYSQL_THDVAR_BASIC(name, char) = { \ PLUGIN_VAR_BOOL | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, NULL} #define MYSQL_THDVAR_STR(name, opt, comment, check, update, def) \ DECLARE_MYSQL_THDVAR_BASIC(name, char *) = { \ PLUGIN_VAR_STR | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, NULL} #define MYSQL_THDVAR_INT(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, int) = { \ PLUGIN_VAR_INT | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_UINT(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, unsigned int) = { \ PLUGIN_VAR_INT | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_LONG(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, long) = { \ PLUGIN_VAR_LONG | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_ULONG(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, unsigned long) = { \ PLUGIN_VAR_LONG | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_LONGLONG(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, longlong) = { \ PLUGIN_VAR_LONGLONG | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_ULONGLONG(name, opt, comment, check, update, def, min, max, blk) \ DECLARE_MYSQL_THDVAR_SIMPLE(name, ulonglong) = { \ PLUGIN_VAR_LONGLONG | PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_UNSIGNED | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, min, max, blk, NULL } #define MYSQL_THDVAR_ENUM(name, opt, comment, check, update, def, typelib) \ DECLARE_MYSQL_THDVAR_TYPELIB(name) = { \ PLUGIN_VAR_ENUM | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, NULL, typelib } #define MYSQL_THDVAR_SET(name, opt, comment, check, update, def, typelib) \ DECLARE_MYSQL_THDVAR_TYPELIB(name) = { \ PLUGIN_VAR_SET | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \ #name, comment, check, update, -1, def, NULL, typelib } /* accessor macros */ #define SYSVAR(name) \ (*(MYSQL_SYSVAR_NAME(name).value)) /* when thd == null, result points to global value */ #define THDVAR(thd, name) \ (*(MYSQL_SYSVAR_NAME(name).resolve(thd, MYSQL_SYSVAR_NAME(name).offset))) /* Plugin description structure. */ struct st_mysql_plugin { int type; /* the plugin type (a MYSQL_XXX_PLUGIN value) */ void *info; /* pointer to type-specific plugin descriptor */ const char *name; /* plugin name */ const char *author; /* plugin author (for SHOW PLUGINS) */ const char *descr; /* general descriptive text (for SHOW PLUGINS ) */ int license; /* the plugin license (PLUGIN_LICENSE_XXX) */ int (*init)(void *); /* the function to invoke when plugin is loaded */ int (*deinit)(void *);/* the function to invoke when plugin is unloaded */ unsigned int version; /* plugin version (for SHOW PLUGINS) */ struct st_mysql_show_var *status_vars; struct st_mysql_sys_var **system_vars; void * __reserved1; /* reserved for dependency checking */ }; /************************************************************************* API for Full-text parser plugin. (MYSQL_FTPARSER_PLUGIN) */ #define MYSQL_FTPARSER_INTERFACE_VERSION 0x0100 /* Parsing modes. Set in MYSQL_FTPARSER_PARAM::mode */ enum enum_ftparser_mode { /* Fast and simple mode. This mode is used for indexing, and natural language queries. The parser is expected to return only those words that go into the index. Stopwords or too short/long words should not be returned. The 'boolean_info' argument of mysql_add_word() does not have to be set. */ MYSQL_FTPARSER_SIMPLE_MODE= 0, /* Parse with stopwords mode. This mode is used in boolean searches for "phrase matching." The parser is not allowed to ignore words in this mode. Every word should be returned, including stopwords and words that are too short or long. The 'boolean_info' argument of mysql_add_word() does not have to be set. */ MYSQL_FTPARSER_WITH_STOPWORDS= 1, /* Parse in boolean mode. This mode is used to parse a boolean query string. The parser should provide a valid MYSQL_FTPARSER_BOOLEAN_INFO structure in the 'boolean_info' argument to mysql_add_word(). Usually that means that the parser should recognize boolean operators in the parsing stream and set appropriate fields in MYSQL_FTPARSER_BOOLEAN_INFO structure accordingly. As for MYSQL_FTPARSER_WITH_STOPWORDS mode, no word should be ignored. Instead, use FT_TOKEN_STOPWORD for the token type of such a word. */ MYSQL_FTPARSER_FULL_BOOLEAN_INFO= 2 }; /* Token types for boolean mode searching (used for the type member of MYSQL_FTPARSER_BOOLEAN_INFO struct) FT_TOKEN_EOF: End of data. FT_TOKEN_WORD: Regular word. FT_TOKEN_LEFT_PAREN: Left parenthesis (start of group/sub-expression). FT_TOKEN_RIGHT_PAREN: Right parenthesis (end of group/sub-expression). FT_TOKEN_STOPWORD: Stopword. */ enum enum_ft_token_type { FT_TOKEN_EOF= 0, FT_TOKEN_WORD= 1, FT_TOKEN_LEFT_PAREN= 2, FT_TOKEN_RIGHT_PAREN= 3, FT_TOKEN_STOPWORD= 4 }; /* This structure is used in boolean search mode only. It conveys boolean-mode metadata to the MySQL search engine for every word in the search query. A valid instance of this structure must be filled in by the plugin parser and passed as an argument in the call to mysql_add_word (the callback function in the MYSQL_FTPARSER_PARAM structure) when a query is parsed in boolean mode. type: The token type. Should be one of the enum_ft_token_type values. yesno: Whether the word must be present for a match to occur: >0 Must be present <0 Must not be present 0 Neither; the word is optional but its presence increases the relevance With the default settings of the ft_boolean_syntax system variable, >0 corresponds to the '+' operator, <0 corrresponds to the '-' operator, and 0 means neither operator was used. weight_adjust: A weighting factor that determines how much a match for the word counts. Positive values increase, negative - decrease the relative word's importance in the query. wasign: The sign of the word's weight in the query. If it's non-negative the match for the word will increase document relevance, if it's negative - decrease (the word becomes a "noise word", the less of it the better). trunc: Corresponds to the '*' operator in the default setting of the ft_boolean_syntax system variable. */ typedef struct st_mysql_ftparser_boolean_info { enum enum_ft_token_type type; int yesno; int weight_adjust; char wasign; char trunc; /* These are parser state and must be removed. */ char prev; char *quot; } MYSQL_FTPARSER_BOOLEAN_INFO; /* The following flag means that buffer with a string (document, word) may be overwritten by the caller before the end of the parsing (that is before st_mysql_ftparser::deinit() call). If one needs the string to survive between two successive calls of the parsing function, she needs to save a copy of it. The flag may be set by MySQL before calling st_mysql_ftparser::parse(), or it may be set by a plugin before calling st_mysql_ftparser_param::mysql_parse() or st_mysql_ftparser_param::mysql_add_word(). */ #define MYSQL_FTFLAGS_NEED_COPY 1 /* An argument of the full-text parser plugin. This structure is filled in by MySQL server and passed to the parsing function of the plugin as an in/out parameter. mysql_parse: A pointer to the built-in parser implementation of the server. It's set by the server and can be used by the parser plugin to invoke the MySQL default parser. If plugin's role is to extract textual data from .doc, .pdf or .xml content, it might extract plaintext from the content, and then pass the text to the default MySQL parser to be parsed. mysql_add_word: A server callback to add a new word. When parsing a document, the server sets this to point at a function that adds the word to MySQL full-text index. When parsing a search query, this function will add the new word to the list of words to search for. The boolean_info argument can be NULL for all cases except when mode is MYSQL_FTPARSER_FULL_BOOLEAN_INFO. ftparser_state: A generic pointer. The plugin can set it to point to information to be used internally for its own purposes. mysql_ftparam: This is set by the server. It is used by MySQL functions called via mysql_parse() and mysql_add_word() callback. The plugin should not modify it. cs: Information about the character set of the document or query string. doc: A pointer to the document or query string to be parsed. length: Length of the document or query string, in bytes. flags: See MYSQL_FTFLAGS_* constants above. mode: The parsing mode. With boolean operators, with stopwords, or nothing. See enum_ftparser_mode above. */ typedef struct st_mysql_ftparser_param { int (*mysql_parse)(struct st_mysql_ftparser_param *, char *doc, int doc_len); int (*mysql_add_word)(struct st_mysql_ftparser_param *, char *word, int word_len, MYSQL_FTPARSER_BOOLEAN_INFO *boolean_info); void *ftparser_state; void *mysql_ftparam; struct charset_info_st *cs; char *doc; int length; int flags; enum enum_ftparser_mode mode; } MYSQL_FTPARSER_PARAM; /* Full-text parser descriptor. interface_version is, e.g., MYSQL_FTPARSER_INTERFACE_VERSION. The parsing, initialization, and deinitialization functions are invoked per SQL statement for which the parser is used. */ struct st_mysql_ftparser { int interface_version; int (*parse)(MYSQL_FTPARSER_PARAM *param); int (*init)(MYSQL_FTPARSER_PARAM *param); int (*deinit)(MYSQL_FTPARSER_PARAM *param); }; /************************************************************************* API for Storage Engine plugin. (MYSQL_DAEMON_PLUGIN) */ /* handlertons of different MySQL releases are incompatible */ #define MYSQL_DAEMON_INTERFACE_VERSION (MYSQL_VERSION_ID << 8) /************************************************************************* API for I_S plugin. (MYSQL_INFORMATION_SCHEMA_PLUGIN) */ /* handlertons of different MySQL releases are incompatible */ #define MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION (MYSQL_VERSION_ID << 8) /************************************************************************* API for Storage Engine plugin. (MYSQL_STORAGE_ENGINE_PLUGIN) */ /* handlertons of different MySQL releases are incompatible */ #define MYSQL_HANDLERTON_INTERFACE_VERSION (MYSQL_VERSION_ID << 8) /* The real API is in the sql/handler.h Here we define only the descriptor structure, that is referred from st_mysql_plugin. */ struct st_mysql_storage_engine { int interface_version; }; struct handlerton; /* Here we define only the descriptor structure, that is referred from st_mysql_plugin. */ struct st_mysql_daemon { int interface_version; }; /* Here we define only the descriptor structure, that is referred from st_mysql_plugin. */ struct st_mysql_information_schema { int interface_version; }; /* st_mysql_value struct for reading values from mysqld. Used by server variables framework to parse user-provided values. Will be used for arguments when implementing UDFs. Note that val_str() returns a string in temporary memory that will be freed at the end of statement. Copy the string if you need it to persist. */ #define MYSQL_VALUE_TYPE_STRING 0 #define MYSQL_VALUE_TYPE_REAL 1 #define MYSQL_VALUE_TYPE_INT 2 struct st_mysql_value { int (*value_type)(struct st_mysql_value *); const char *(*val_str)(struct st_mysql_value *, char *buffer, int *length); int (*val_real)(struct st_mysql_value *, double *realbuf); int (*val_int)(struct st_mysql_value *, long long *intbuf); }; /************************************************************************* Miscellaneous functions for plugin implementors */ #ifdef __cplusplus extern "C" { #endif int thd_in_lock_tables(const MYSQL_THD thd); int thd_tablespace_op(const MYSQL_THD thd); long long thd_test_options(const MYSQL_THD thd, long long test_options); int thd_sql_command(const MYSQL_THD thd); const char *thd_proc_info(MYSQL_THD thd, const char *info); void **thd_ha_data(const MYSQL_THD thd, const struct handlerton *hton); int thd_tx_isolation(const MYSQL_THD thd); char *thd_security_context(MYSQL_THD thd, char *buffer, unsigned int length, unsigned int max_query_len); #ifdef __cplusplus } #endif #endif