# mssql_select_db

(PHP 4, PHP 5, PECL odbtp >= 1.1.1)

mssql_select_db — Select MS SQL database

Warning

This function was REMOVED in PHP 7.0.0.

Alternatives to this function include:

- PDO_SQLSRV DSN
- PDO_ODBC DSN
- sqlsrv_connect()
- odbc_connect()

### 说明

mssql_select_db ( string `$database_name` [, resource `$link_identifier` ] ) : bool

mssql_select_db() sets the current active database on the server that's associated with the specified link identifier.

Every subsequent call to mssql_query() will be made on the active database.

### 参数

`database_name`

  The database name.

  To escape the name of a database that contains spaces, hyphens ("-"), or any other exceptional characters, the database name must be enclosed in brackets, as is shown in the example, below. This technique must also be applied when selecting a database name that is also a reserved word (such as primary).

`link_identifier`

  A MS SQL link identifier, returned by mssql_connect() or mssql_pconnect().

  If no link identifier is specified, the last opened link is assumed. If no link is open, the function will try to establish a link as if mssql_connect() was called, and use it.

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。

### 范例

Example #1 mssql_select_db() example

    <?php
    // Create a link to MSSQL
    $link = mssql_connect('KALLESPC\SQLEXPRESS', 'sa', 'phpfi');

    // Select the database 'php'
    mssql_select_db('php', $link);
    ?>

Example #2 Escaping the database name with square brackets

    <?php
    // Create a link to MSSQL
    $link = mssql_connect('KALLESPC\SQLEXPRESS', 'sa', 'phpfi');

    // Select the database 'my.database-name'
    mssql_select_db('[my.database-name]', $link);
    ?>

### 参见

- mssql_connect() - 打开MS SQL server链接
- mssql_pconnect() - Open persistent MS SQL connection
- mssql_query() - Send MS SQL query