maxdb_select_db(3) [php man page]

MAXDB_SELECT_DB(3)							 1							MAXDB_SELECT_DB(3)

maxdb_select_db - Selects the default database for database queries

SYNOPSIS

       bool maxdb_select_db (resource  $link, string  $dbname)

DESCRIPTION

	The  maxdb_select_db(3)  function  selects  the  default  database (specified by the $dbname parameter) to be used when performing queries
       against the database connection represented by the $link parameter.

       Note

	       This function should only be used to change the default database for the connection. You can select the default database  with  4th
	      parameter in maxdb_connect(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Object oriented style

	      <?php
	      $maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

	      /* check connection */
	      if (maxdb_connect_errno()) {
		 printf("Connect failed: %s
", maxdb_connect_error());
		 exit();
	      }

	      /* return name of current default database */
	      if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
		 $row = $result->fetch_row();
		 printf("Default database is %s.
", $row[0]);
		 $result->close();
	      }

	      /* change db to non existing db */
	      $maxdb->select_db("XXXXXXXX");

	      /* return name of current default database */
	      if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
		 $row = $result->fetch_row();
		 printf("Default database is %s.
", $row[0]);
		 $result->close();
	      }

	      $maxdb->close();
	      ?>

       Example #2

	      Procedural style

	      <?php
	      $link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

	      /* check connection */
	      if (maxdb_connect_errno()) {
		 printf("Connect failed: %s
", maxdb_connect_error());
		 exit();
	      }

	      /* return name of current default database */
	      if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
		 $row = maxdb_fetch_row($result);
		 printf("Default database is %s.
", $row[0]);
		 maxdb_free_result($result);
	      }

	      /* change db to non existing db */
	      maxdb_select_db($link, "XXXXXXXX");

	      /* return name of current default database */
	      if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
		 $row = maxdb_fetch_row($result);
		 printf("Default database is %s.
", $row[0]);
		 maxdb_free_result($result);
	      }

	      maxdb_close($link);
	      ?>

       The above example will output something similar to:

       Default database is <...>.

       Warning: maxdb_select_db(): -10709 Connection failed (RTE:database not running) <...>

       Warning: maxdb_query(): -10821 Session not connected [] <...>

       Warning: maxdb_close(): -10821 Session not connected [] <...>

SEE ALSO

       maxdb_connect(3), maxdb_real_connect(3).

PHP Documentation Group 													MAXDB_SELECT_DB(3)

MAXDB_ROLLBACK(3)							 1							 MAXDB_ROLLBACK(3)

maxdb_rollback - Rolls back current transaction

       Procedural style

SYNOPSIS

       bool maxdb_rollback (resource  $link)

DESCRIPTION

       Object oriented style
       bool maxdb::rollback (void  )

	Rollbacks the current transaction for the database specified by the $link parameter.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Object oriented style

	      <?php
	      $maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

	      /* check connection */
	      if (maxdb_connect_errno()) {
		 printf("Connect failed: %s
", maxdb_connect_error());
		 exit();
	      }

	      /* disable autocommit */
	      $maxdb->autocommit(FALSE);

	      $maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city");
	      $maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city");

	      /* commit insert */
	      $maxdb->commit();

	      /* delete all rows */
	      $maxdb->query("DELETE FROM temp.mycity");

	      if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
		 $row = $result->fetch_row();
		 printf("%d rows in table mycity.
", $row[0]);
		 /* Free result */
		 $result->close();
	      }

	      /* Rollback */
	      $maxdb->rollback();

	      if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
		 $row = $result->fetch_row();
		 printf("%d rows in table mycity (after rollback).
", $row[0]);
		 /* Free result */
		 $result->close();
	      }

	      /* Drop table myCity */
	      $maxdb->query("DROP TABLE temp.mycity");

	      $maxdb->close();
	      ?>

       Example #2

	      Procedural style

	      <?php
	      $link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

	      /* check connection */
	      if (maxdb_connect_errno()) {
		 printf("Connect failed: %s
", maxdb_connect_error());
		 exit();
	      }

	      /* disable autocommit */
	      maxdb_autocommit($link, FALSE);

	      maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city");
	      maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city");

	      /* commit insert */
	      maxdb_commit($link);

	      /* delete all rows */
	      maxdb_query($link, "DELETE FROM temp.mycity");

	      if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
		 $row = maxdb_fetch_row($result);
		 printf("%d rows in table mycity.
", $row[0]);
		 /* Free result */
		 maxdb_free_result($result);
	      }

	      /* Rollback */
	      maxdb_rollback($link);

	      if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
		 $row = maxdb_fetch_row($result);
		 printf("%d rows in table mycity (after rollback).
", $row[0]);
		 /* Free result */
		 maxdb_free_result($result);
	      }

	      /* Drop table myCity */
	      maxdb_query($link, "DROP TABLE temp.mycity");

	      maxdb_close($link);
	      ?>

       The above example will output something similar to:

       0 rows in table mycity.
       25 rows in table mycity (after rollback).

SEE ALSO

       maxdb_commit(3), maxdb_autocommit(3).

PHP Documentation Group 													 MAXDB_ROLLBACK(3)