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SQLITE3_PREPARE(3)         Library Functions Manual         SQLITE3_PREPARE(3)

NAME
     sqlite3_prepare, sqlite3_prepare_v2, sqlite3_prepare_v3,
     sqlite3_prepare16, sqlite3_prepare16_v2, sqlite3_prepare16_v3 - Compiling
     An SQL Statement

SYNOPSIS
     int
     sqlite3_prepare(sqlite3 *db, const char *zSql, int nByte,
         sqlite3_stmt **ppStmt, const char **pzTail     );

     int
     sqlite3_prepare_v2(sqlite3 *db, const char *zSql, int nByte,
         sqlite3_stmt **ppStmt, const char **pzTail     );

     int
     sqlite3_prepare_v3(sqlite3 *db, const char *zSql, int nByte,
         unsigned int prepFlags, sqlite3_stmt **ppStmt,
         const char **pzTail     );

     int
     sqlite3_prepare16(sqlite3 *db, const void *zSql, int nByte,
         sqlite3_stmt **ppStmt, const void **pzTail     );

     int
     sqlite3_prepare16_v2(sqlite3 *db, const void *zSql, int nByte,
         sqlite3_stmt **ppStmt, const void **pzTail     );

     int
     sqlite3_prepare16_v3(sqlite3 *db, const void *zSql, int nByte,
         unsigned int prepFlags, sqlite3_stmt **ppStmt,
         const void **pzTail     );

DESCRIPTION
     To execute an SQL statement, it must first be compiled into a byte-code
     program using one of these routines.  Or, in other words, these routines
     are constructors for the prepared statement object.

     The preferred routine to use is sqlite3_prepare_v2().  The
     sqlite3_prepare() interface is legacy and should be avoided.
     sqlite3_prepare_v3() has an extra "prepFlags" option that is used for
     special purposes.

     The use of the UTF-8 interfaces is preferred, as SQLite currently does
     all parsing using UTF-8.  The UTF-16 interfaces are provided as a
     convenience.  The UTF-16 interfaces work by converting the input text
     into UTF-8, then invoking the corresponding UTF-8 interface.

     The first argument, "db", is a database connection obtained from a prior
     successful call to sqlite3_open(), sqlite3_open_v2() or sqlite3_open16().
     The database connection must not have been closed.

     The second argument, "zSql", is the statement to be compiled, encoded as
     either UTF-8 or UTF-16.  The sqlite3_prepare(), sqlite3_prepare_v2(), and
     sqlite3_prepare_v3() interfaces use UTF-8, and sqlite3_prepare16(),
     sqlite3_prepare16_v2(), and sqlite3_prepare16_v3() use UTF-16.

     If the nByte argument is negative, then zSql is read up to the first zero
     terminator.  If nByte is positive, then it is the number of bytes read
     from zSql.  If nByte is zero, then no prepared statement is generated.
     If the caller knows that the supplied string is nul-terminated, then
     there is a small performance advantage to passing an nByte parameter that
     is the number of bytes in the input string <i>including</i> the nul-
     terminator.

     If pzTail is not NULL then *pzTail is made to point to the first byte
     past the end of the first SQL statement in zSql.  These routines only
     compile the first statement in zSql, so *pzTail is left pointing to what
     remains uncompiled.

     *ppStmt is left pointing to a compiled prepared statement that can be
     executed using sqlite3_step().  If there is an error, *ppStmt is set to
     NULL.  If the input text contains no SQL (if the input is an empty string
     or a comment) then *ppStmt is set to NULL.  The calling procedure is
     responsible for deleting the compiled SQL statement using
     sqlite3_finalize() after it has finished with it.  ppStmt may not be
     NULL.

     On success, the sqlite3_prepare() family of routines return SQLITE_OK;
     otherwise an error code is returned.

     The sqlite3_prepare_v2(), sqlite3_prepare_v3(), sqlite3_prepare16_v2(),
     and sqlite3_prepare16_v3() interfaces are recommended for all new
     programs.  The older interfaces (sqlite3_prepare() and
     sqlite3_prepare16()) are retained for backwards compatibility, but their
     use is discouraged.  In the "vX" interfaces, the prepared statement that
     is returned (the sqlite3_stmt object) contains a copy of the original SQL
     text.  This causes the sqlite3_step() interface to behave differently in
     three ways:

     1.   If the database schema changes, instead of returning SQLITE_SCHEMA
          as it always used to do, sqlite3_step() will automatically recompile
          the SQL statement and try to run it again.  As many as
          SQLITE_MAX_SCHEMA_RETRY retries will occur before sqlite3_step()
          gives up and returns an error.

     2.   When an error occurs, sqlite3_step() will return one of the detailed
          error codes or extended error codes.  The legacy behavior was that
          sqlite3_step() would only return a generic SQLITE_ERROR result code
          and the application would have to make a second call to
          sqlite3_reset() in order to find the underlying cause of the
          problem.  With the "v2" prepare interfaces, the underlying reason
          for the error is returned immediately.

     3.   If the specific value bound to  host parameter in the WHERE clause
          might influence the choice of query plan for a statement, then the
          statement will be automatically recompiled, as if there had been a
          schema change, on the first  sqlite3_step() call following any
          change to the  bindings of that parameter.  The specific value of
          WHERE-clause parameter might influence the choice of query plan if
          the parameter is the left-hand side of a LIKE or GLOB operator or if
          the parameter is compared to an indexed column and the
          SQLITE_ENABLE_STAT3 compile-time option is enabled.

     <p> sqlite3_prepare_v3() differs from sqlite3_prepare_v2() only in having
     the extra prepFlags parameter, which is a bit array consisting of zero or
     more of the SQLITE_PREPARE_* flags.  The sqlite3_prepare_v2() interface
     works exactly the same as sqlite3_prepare_v3() with a zero prepFlags
     parameter.

SEE ALSO
     sqlite3(3), sqlite3_stmt(3), sqlite3_bind_blob(3), sqlite3_finalize(3),
     sqlite3_open(3), sqlite3_prepare(3), sqlite3_reset(3), sqlite3_step(3),
     sqlite3_stmt(3), SQLITE_OK(3), SQLITE_PREPARE_PERSISTENT(3), SQLITE_OK(3)

NetBSD 8.99.34                 December 19, 2018                NetBSD 8.99.34