maxdb_stmt_result_metadata

maxdb_stmt::result_metadata

(PECL maxdb >= 1.0)

maxdb_stmt_result_metadata -- maxdb_stmt::result_metadataReturns 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:

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();

/* get resultset for metadata */
$result $stmt->result_metadata();

/* retrieve field information from metadata result set */
$field $result->fetch_field();

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

/* close resultset */
$result->close();

/* close connection */
$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);

/* get resultset for metadata */
$result maxdb_stmt_result_metadata($stmt);

/* retrieve field information from metadata result set */
$field maxdb_fetch_field($result);

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

/* close resultset */
maxdb_free_result($result);

/* close connection */
maxdb_close($link);
?>

以上例程的输出类似于:

Fieldname: ID

参见