maxdb_stmt_result_metadata

maxdb_stmt::result_metadata

(PECL maxdb >= 1.0)

maxdb_stmt_result_metadata -- maxdb_stmt::result_metadata — Returns result set metadata from a prepared statement

说明

过程化风格

resource maxdb_stmt_result_metadata ( resource $stmt )

面向对象风格

resource maxdb_stmt::result_metadata ( void )

If a statement passed to maxdb_prepare() is one that produces a result set, maxdb_stmt_result_metadata() returns the result resource that can be used to process the meta information such as total number of fields and individual field information.

Note:

This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as:

maxdb_num_fields()

maxdb_fetch_field()

maxdb_fetch_field_direct()

maxdb_fetch_fields()

maxdb_field_count()

maxdb_field_seek()

maxdb_field_tell()

maxdb_free_result()

The result set structure should be freed when you are done with it, which you can do by passing it to maxdb_free_result()

Note:

The result set returned by maxdb_stmt_result_metadata() contains only metadata. It does not contain any row results. The rows are obtained by using the statement handle with maxdb_fetch() .

返回值

maxdb_stmt_result_metadata() returns a result resource or FALSE if an error occurred.

范例

Example #1 面向对象风格

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

 $maxdb -> query ( "CREATE TABLE temp.friends (id int, name varchar(20))" );

 $maxdb -> query ( "INSERT INTO temp.friends VALUES (1,'Hartmut')" );
 $maxdb -> query ( "INSERT INTO temp.friends VALUES (2, 'Ulf')" );

 $stmt  =  $maxdb -> prepare ( "SELECT id, name FROM temp.friends" );
 $stmt -> execute ();

 
 $result  =  $stmt -> result_metadata ();

 
 $field  =  $result -> fetch_field ();

 printf ( "Fieldname: %s\n" ,  $field -> name );

 
 $result -> close ();

 
 $maxdb -> close ();
 ?>

Example #2 过程化风格

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

 maxdb_query ( $link ,  "CREATE TABLE temp.friends (id int, name varchar(20))" );

 maxdb_query ( $link ,  "INSERT INTO temp.friends VALUES (1,'Hartmut')" );
 maxdb_query ( $link ,  "INSERT INTO temp.friends VALUES (2, 'Ulf')" );

 $stmt  =  maxdb_prepare ( $link ,  "SELECT id, name FROM temp.friends" );
 maxdb_stmt_execute ( $stmt );

 
 $result  =  maxdb_stmt_result_metadata ( $stmt );

 
 $field  =  maxdb_fetch_field ( $result );

 printf ( "Fieldname: %s\n" ,  $field -> name );

 
 maxdb_free_result ( $result );

 
 maxdb_close ( $link );
 ?>

以上例程的输出类似于：

Fieldname: ID

参见

maxdb_prepare() - Prepare an SQL statement for execution
maxdb_free_result() - Frees the memory associated with a result