SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.200 2007/03/28 13:07:41 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.

** Enable or disable the extended result codes.
*/
int sqlite3_extended_result_codes(sqlite3*, int onoff);

/*
** Each entry in an SQLite table has a unique integer key.  (The key is
** the value of the INTEGER PRIMARY KEY column if there is such a column,
** otherwise the key is generated automatically.  The unique key is always
** available as the ROWID, OID, or _ROWID_ column.)  The following routine
** returns the integer key of the most recent insert in the database.


*/
sqlite_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** This function returns the number of database rows that were changed
** (or inserted or deleted) by the most recent SQL statement.  Only
** changes that are directly specified by the INSERT, UPDATE, or
** DELETE statement are counted.  Auxiliary changes caused by
** triggers are not counted.   Within the body of a trigger, however,
** the sqlite3_changes() API can be called to find the number of
** changes in the most recently completed INSERT, UPDATE, or DELETE
** statement within the body of the trigger.
**
** All changes are counted, even if they were later undone by a
** ROLLBACK or ABORT.  Except, changes associated with creating and
** dropping tables are not counted.
**
** If a callback invokes sqlite3_exec() or sqlite3_step() recursively,
** then the changes in the inner, recursive call are counted together
** with the changes in the outer call.
**
** SQLite implements the command "DELETE FROM table" without a WHERE clause
** by dropping and recreating the table.  (This is much faster than going
** through and deleting individual elements form the table.)  Because of
** this optimization, the change count for "DELETE FROM table" will be
** zero regardless of the number of elements that were originally in the
** table. To get an accurate count of the number of rows deleted, use

int sqlite3_total_changes(sqlite3*);

/* This function causes any pending database operation to abort and
** return at its earliest opportunity.  This routine is typically
** called in response to a user action such as pressing "Cancel"
** or Ctrl-C where the user wants a long query operation to halt
** immediately.
**
** It is safe to call this routine from a different thread that the
** thread that is currently running the database operation. 
*/
void sqlite3_interrupt(sqlite3*);


/* These functions return true if the given input string comprises
** one or more complete SQL statements. For the sqlite3_complete() call,
** the parameter must be a nul-terminated UTF-8 string. For
** sqlite3_complete16(), a nul-terminated machine byte order UTF-16 string
** is required.
**
** This routine is useful for command-line input to see of the user has
** entered a complete statement of SQL or if the current statement needs
** to be continued on the next line.  The algorithm is simple.  If the 
** last token other than spaces and comments is a semicolon, then return 

** true.  Actually, the algorithm is a little more complicated than that
** in order to deal with triggers, but the basic idea is the same:  the
** statement is not complete unless it ends in a semicolon.
*/
int sqlite3_complete(const char *sql);
int sqlite3_complete16(const void *sql);

/*
** This routine identifies a callback function that is invoked
** whenever an attempt is made to open a database table that is

** with the implementations of user-defined functions.
*/
typedef struct sqlite3_context sqlite3_context;
typedef struct Mem sqlite3_value;

/*
** In the SQL strings input to sqlite3_prepare() and sqlite3_prepare16(),
** one or more literals can be replace by parameters "?" or "?NNN" or 
** ":AAA" or "@AAA" or "$VVV" where NNN is a integer, AAA is an identifer,
** and VVV is a variable name according  to the syntax rules of the
** TCL programming language.  The value of these parameters (also called
** "host parameter names") can be set using the routines listed below.
**
** In every case, the first argument is a pointer to the sqlite3_stmt
** structure returned from sqlite3_prepare().  The second argument is the
** index of the host parameter name.  The first host parameter as an index 
** of 1.  For named host parameters (":AAA" or "$VVV") you can use 
** sqlite3_bind_parameter_index() to get the correct index value given
** the parameter name.  If the same named parameter occurs more than
** once, it is assigned the same index each time.
**
** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
** text after SQLite has finished with it.  If the fifth argument is the
** special value SQLITE_STATIC, then the library assumes that the information
** is in static, unmanaged space and does not need to be freed.  If the
** fifth argument has the value SQLITE_TRANSIENT, then SQLite makes its
** own private copy of the data before the sqlite3_bind_* routine returns.
**
** The sqlite3_bind_* routine must be called before sqlite3_step() and after
** an sqlite3_prepare() or sqlite3_reset().  Bindings persist across
** multiple calls to sqlite3_reset() and sqlite3_step().  Unbound parameters 
** are interpreted as NULL.
*/
int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
int sqlite3_bind_double(sqlite3_stmt*, int, double);
int sqlite3_bind_int(sqlite3_stmt*, int, int);
int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite_int64);
int sqlite3_bind_null(sqlite3_stmt*, int);
int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);

/*
** Return the number of host parameters in a compiled SQL statement.  This
** routine was added to support DBD::SQLite.
*/
int sqlite3_bind_parameter_count(sqlite3_stmt*);

/*
** Return the name of the i-th name parameter.  Ordinary parameters "?" are
** nameless and a NULL is returned.  For parameters of the form :AAA or
** $VVV the complete text of the parameter name is returned, including
** the initial ":" or "$".  NULL is returned if the index is out of range.
*/
const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);

/*

** second function parameter.  The string returned is UTF-8 for
** sqlite3_column_name() and UTF-16 for sqlite3_column_name16().
*/
const char *sqlite3_column_name(sqlite3_stmt*,int);
const void *sqlite3_column_name16(sqlite3_stmt*,int);

/*
** The first argument to the following calls is a compiled SQL statement.
** These functions return information about the Nth column returned by 
** the statement, where N is the second function argument.
**
** If the Nth column returned by the statement is not a column value,
** then all of the functions return NULL. Otherwise, the return the 
** name of the attached database, table and column that the expression
** extracts a value from.