SQLite

#else
  return 0;
#endif
}


/*
** Checkpoint database zDb. If zDb is NULL, or if the buffer zDb points
** to contains a zero-length string, all attached databases are 
** checkpointed.
*/
int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
#ifdef SQLITE_OMIT_WAL
  return SQLITE_OK;
#else
  int rc;                         /* Return code */
  int iDb = SQLITE_MAX_ATTACHED;  /* sqlite3.aDb[] index of db to checkpoint */

  sqlite3_mutex_enter(db->mutex);
  if( zDb && zDb[0] ){
    iDb = sqlite3FindDbName(db, zDb);
  }
  if( iDb<0 ){
    rc = SQLITE_ERROR;
    sqlite3Error(db, SQLITE_ERROR, "unknown database: %s", zDb);
  }else{
    rc = sqlite3Checkpoint(db, iDb);

  /*
  **   PRAGMA [database.]wal_checkpoint
  **
  ** Checkpoint the database.
  */
  if( sqlite3StrICmp(zLeft, "wal_checkpoint")==0 ){
    if( sqlite3ReadSchema(pParse) ) goto pragma_out;
    sqlite3VdbeAddOp3(v, OP_Checkpoint, pId2->z?iDb:SQLITE_MAX_ATTACHED, 0, 0);
  }else

  /*
  **   PRAGMA wal_autocheckpoint
  **   PRAGMA wal_autocheckpoint = N
  **
  ** Configure a database connection to automatically checkpoint a database

} {SQLITE_OK}
do_test wal-15.4.5 {
  sqlite3_errmsg db
} {not an error}
do_test wal-15.4.6 {
  file size test.db
} [expr 1024*2]

catch { db2 close }
catch { db close }

#-------------------------------------------------------------------------
# The following block of tests - wal-16.* - test that if a NULL pointer or
# an empty string is passed as the second argument of the wal_checkpoint()
# API, an attempt is made to checkpoint all attached databases.
#
foreach {tn ckpt_cmd ckpt_res ckpt_main ckpt_aux} {
  1 {sqlite3_wal_checkpoint db}              SQLITE_OK     1 1
  2 {sqlite3_wal_checkpoint db ""}           SQLITE_OK     1 1
  3 {db eval "PRAGMA wal_checkpoint"}        {}            1 1

  4 {sqlite3_wal_checkpoint db main}         SQLITE_OK     1 0
  5 {sqlite3_wal_checkpoint db aux}          SQLITE_OK     0 1
  6 {sqlite3_wal_checkpoint db temp}         SQLITE_OK     0 0
  7 {db eval "PRAGMA main.wal_checkpoint"}   {}            1 0
  8 {db eval "PRAGMA aux.wal_checkpoint"}    {}            0 1
  9 {db eval "PRAGMA temp.wal_checkpoint"}   {}            0 0
} {
  do_test wal-16.$tn.1 {
    file delete -force test2.db test2.db-wal test2.db-journal
    file delete -force test.db test.db-wal test.db-journal

    sqlite3 db test.db
    execsql {
      ATTACH 'test2.db' AS aux;
      PRAGMA main.journal_mode = WAL;
      PRAGMA aux.journal_mode = WAL;
      PRAGMA synchronous = NORMAL;
    }
  } {wal wal}

  do_test wal-16.$tn.2 {
    execsql {
      CREATE TABLE main.t1(a, b, PRIMARY KEY(a, b));
      CREATE TABLE aux.t2(a, b, PRIMARY KEY(a, b));

      INSERT INTO t2 VALUES(1, randomblob(1000));
      INSERT INTO t2 VALUES(2, randomblob(1000));
      INSERT INTO t1 SELECT * FROM t2;
    }
  
    list [file size test.db] [file size test.db-wal]
  } [list [expr 1*1024] [log_file_size 10 1024]]
  do_test wal-16.$tn.3 {
    list [file size test2.db] [file size test2.db-wal]
  } [list [expr 1*1024] [log_file_size 16 1024]]
  
  do_test wal-16.$tn.4 [list eval $ckpt_cmd] $ckpt_res
  
  do_test wal-16.$tn.5 {
    list [file size test.db] [file size test.db-wal]
  } [list [expr ($ckpt_main ? 7 : 1)*1024] [log_file_size 10 1024]]

  do_test wal-16.$tn.6 {
    list [file size test2.db] [file size test2.db-wal]
  } [list [expr ($ckpt_aux ? 7 : 1)*1024] [log_file_size 16 1024]]

  catch { db close }
}

catch { db2 close }
catch { db close }
finish_test