sqlite.h.in

SQLite 2.8.6 源代码,用来在Linux/Unix/Windows上编译安装.它是一个小型的数据库,但是非常好用,速度也快,一般的数据库查询之类的操作据统计比MySQL,PostgreSQL

** second argument is the name of the locked table and the third
** argument is the number of times the table has been busy.  If the
** busy callback returns 0, then sqlite_exec() immediately returns
** SQLITE_BUSY.  If the callback returns non-zero, then sqlite_exec()
** tries to open the table again and the cycle repeats.
**
** The default busy callback is NULL.
**
** Sqlite is re-entrant, so the busy handler may start a new query. 
** (It is not clear why anyone would every want to do this, but it
** is allowed, in theory.)  But the busy handler may not close the
** database.  Closing the database from a busy handler will delete 
** data structures out from under the executing query and will 
** probably result in a coredump.
*/
void sqlite_busy_handler(sqlite*, int(*)(void*,const char*,int), void*);

/*
** This routine sets a busy handler that sleeps for a while when a
** table is locked.  The handler will sleep multiple times until 
** at least "ms" milleseconds of sleeping have been done.  After
** "ms" milleseconds of sleeping, the handler returns 0 which
** causes sqlite_exec() to return SQLITE_BUSY.
**
** Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
*/
void sqlite_busy_timeout(sqlite*, int ms);

/*
** This next routine is really just a wrapper around sqlite_exec().
** Instead of invoking a user-supplied callback for each row of the
** result, this routine remembers each row of the result in memory
** obtained from malloc(), then returns all of the result after the
** query has finished. 
**
** As an example, suppose the query result where this table:
**
**        Name        | Age
**        -----------------------
**        Alice       | 43
**        Bob         | 28
**        Cindy       | 21
**
** If the 3rd argument were &azResult then after the function returns
** azResult will contain the following data:
**
**        azResult[0] = "Name";
**        azResult[1] = "Age";
**        azResult[2] = "Alice";
**        azResult[3] = "43";
**        azResult[4] = "Bob";
**        azResult[5] = "28";
**        azResult[6] = "Cindy";
**        azResult[7] = "21";
**
** Notice that there is an extra row of data containing the column
** headers.  But the *nrow return value is still 3.  *ncolumn is
** set to 2.  In general, the number of values inserted into azResult
** will be ((*nrow) + 1)*(*ncolumn).
**
** After the calling function has finished using the result, it should 
** pass the result data pointer to sqlite_free_table() in order to 
** release the memory that was malloc-ed.  Because of the way the 
** malloc() happens, the calling function must not try to call 
** malloc() directly.  Only sqlite_free_table() is able to release 
** the memory properly and safely.
**
** The return value of this routine is the same as from sqlite_exec().
*/
int sqlite_get_table(
  sqlite*,               /* An open database */
  const char *sql,       /* SQL to be executed */
  char ***resultp,       /* Result written to a char *[]  that this points to */
  int *nrow,             /* Number of result rows written here */
  int *ncolumn,          /* Number of result columns written here */
  char **errmsg          /* Error msg written here */
);

/*
** Call this routine to free the memory that sqlite_get_table() allocated.
*/
void sqlite_free_table(char **result);

/*
** The following routines are wrappers around sqlite_exec() and
** sqlite_get_table().  The only difference between the routines that
** follow and the originals is that the second argument to the 
** routines that follow is really a printf()-style format
** string describing the SQL to be executed.  Arguments to the format
** string appear at the end of the argument list.
**
** All of the usual printf formatting options apply.  In addition, there
** is a "%q" option.  %q works like %s in that it substitutes a null-terminated
** string from the argument list.  But %q also doubles every '\'' character.
** %q is designed for use inside a string literal.  By doubling each '\''
** character it escapes that character and allows it to be inserted into
** the string.
**
** For example, so some string variable contains text as follows:
**
**      char *zText = "It's a happy day!";
**
** We can use this text in an SQL statement as follows:
**
**      sqlite_exec_printf(db, "INSERT INTO table VALUES('%q')",
**          callback1, 0, 0, zText);
**
** Because the %q format string is used, the '\'' character in zText
** is escaped and the SQL generated is as follows:
**
**      INSERT INTO table1 VALUES('It''s a happy day!')
**
** This is correct.  Had we used %s instead of %q, the generated SQL
** would have looked like this:
**
**      INSERT INTO table1 VALUES('It's a happy day!');
**
** This second example is an SQL syntax error.  As a general rule you
** should always use %q instead of %s when inserting text into a string 
** literal.
*/
int sqlite_exec_printf(
  sqlite*,                      /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback,              /* Callback function */
  void *,                       /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  ...                           /* Arguments to the format string. */
);
int sqlite_exec_vprintf(
  sqlite*,                      /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback,              /* Callback function */
  void *,                       /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  va_list ap                    /* Arguments to the format string. */
);
int sqlite_get_table_printf(
  sqlite*,               /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  char ***resultp,       /* Result written to a char *[]  that this points to */
  int *nrow,             /* Number of result rows written here */
  int *ncolumn,          /* Number of result columns written here */
  char **errmsg,         /* Error msg written here */
  ...                    /* Arguments to the format string */
);
int sqlite_get_table_vprintf(
  sqlite*,               /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  char ***resultp,       /* Result written to a char *[]  that this points to */
  int *nrow,             /* Number of result rows written here */
  int *ncolumn,          /* Number of result columns written here */
  char **errmsg,         /* Error msg written here */
  va_list ap             /* Arguments to the format string */
);
char *sqlite_mprintf(const char*,...);
char *sqlite_vmprintf(const char*, va_list);

/*
** Windows systems should call this routine to free memory that
** is returned in the in the errmsg parameter of sqlite_open() when
** SQLite is a DLL.  For some reason, it does not work to call free()
** directly.
*/
void sqlite_freemem(void *p);

/*
** Windows systems need functions to call to return the sqlite_version
** and sqlite_encoding strings.
*/
const char *sqlite_libversion(void);
const char *sqlite_libencoding(void);

/*
** A pointer to the following structure is used to communicate with
** the implementations of user-defined functions.
*/
typedef struct sqlite_func sqlite_func;

/*
** Use the following routines to create new user-defined functions.  See
** the documentation for details.
*/
int sqlite_create_function(
  sqlite*,                  /* Database where the new function is registered */
  const char *zName,        /* Name of the new function */
  int nArg,                 /* Number of arguments.  -1 means any number */
  void (*xFunc)(sqlite_func*,int,const char**),  /* C code to implement */
  void *pUserData           /* Available via the sqlite_user_data() call */
);
int sqlite_create_aggregate(
  sqlite*,                  /* Database where the new function is registered */
  const char *zName,        /* Name of the function */
  int nArg,                 /* Number of arguments */
  void (*xStep)(sqlite_func*,int,const char**), /* Called for each row */
  void (*xFinalize)(sqlite_func*),       /* Called once to get final result */
  void *pUserData           /* Available via the sqlite_user_data() call */
);

/*
** Use the following routine to define the datatype returned by a
** user-defined function.  The second argument can be one of the
** constants SQLITE_NUMERIC, SQLITE_TEXT, or SQLITE_ARGS or it
** can be an integer greater than or equal to zero.  The datatype
** will be numeric or text (the only two types supported) if the
** argument is SQLITE_NUMERIC or SQLITE_TEXT.  If the argument is
** SQLITE_ARGS, then the datatype is numeric if any argument to the
** function is numeric and is text otherwise.  If the second argument
** is an integer, then the datatype of the result is the same as the
** parameter to the function that corresponds to that integer.
*/
int sqlite_function_type(
  sqlite *db,               /* The database there the function is registered */
  const char *zName,        /* Name of the function */
  int datatype              /* The datatype for this function */
);
#define SQLITE_NUMERIC     (-1)
#define SQLITE_TEXT        (-2)
#define SQLITE_ARGS        (-3)

/*
** The user function implementations call one of the following four routines
** in order to return their results.  The first parameter to each of these
** routines is a copy of the first argument to xFunc() or xFinialize().
** The second parameter to these routines is the result to be returned.
** A NULL can be passed as the second parameter to sqlite_set_result_string()
** in order to return a NULL result.
**
** The 3rd argument to _string and _error is the number of characters to
** take from the string.  If this argument is negative, then all characters
** up to and including the first '\000' are used.
**
** The sqlite_set_result_string() function allocates a buffer to hold the
** result and returns a pointer to this buffer.  The calling routine
** (that is, the implmentation of a user function) can alter the content