# sqlsrv_num_fields

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sqlsrv_num_fields — Retrieves the number of fields (columns) on a statement

### 说明

sqlsrv_num_fields ( resource `$stmt` ) : mixed

Retrieves the number of fields (columns) on a statement.

### 参数

`stmt`

  The statment for which the number of fields is returned. sqlsrv_num_fields() can be called on a statement before or after statement execution.

### 返回值

Returns the number of fields on success. Returns `FALSE` otherwise.

### 范例

Example #1 sqlsrv_num_fields() example

    <?php
    $serverName = "serverName\sqlexpress";
    $connectionInfo = array( "Database"=>"dbName", "UID"=>"username", "PWD"=>"password");
    $conn = sqlsrv_connect( $serverName, $connectionInfo);
    if( $conn === false ) {
       die( print_r( sqlsrv_errors(), true));
    }

    $sql = "SELECT * FROM Table_1";
    $stmt = sqlsrv_query($conn, $sql);
    if( $stmt === false) {
       die( print_r( sqlsrv_errors(), true));
    }

    $numFields = sqlsrv_num_fields( $stmt );

    while( sqlsrv_fetch( $stmt )) {
       // Iterate through the fields of each row.
       for($i = 0; $i < $numFields; $i++) {
          echo sqlsrv_get_field($stmt, $i)." ";
       }
       echo "<br />";
    }
    ?>

### 参见

- sqlsrv_field_metadata() - Retrieves metadata for the fields of a statement prepared by sqlsrv_prepare or sqlsrv_query
- sqlsrv_fetch() - Makes the next row in a result set available for reading
- sqlsrv_get_field() - Gets field data from the currently selected row