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PDO::lastInsertId

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返回最近插入数据库中的表的行标识符。 该表必须含有 IDENTITY NOT NULL 列。 如果提供了序列名称，则 lastInsertId 返回提供的序列名称的最新插入的序列号（有关序列号的详细信息，请参阅此处）。

语法

  
string PDO::lastInsertId ([ $name = NULL ] );

参数

$name：允许指定序列名称的可选字符串。

返回值

如果未提供序列名称，则为最近添加的行的标识符的字符串。 如果提供了序列名称，则为最近添加的序列的标识符的字符串。 如果方法调用失败，则返回空字符串。

注解

已在 Microsoft Drivers for PHP for SQL Server的版本 2.0 中添加了对 PDO 的支持。
在版本 2.0 和 4.3 之间，可选参数是表名称，返回值是最近添加到提供的表中的行的 ID。 从 5.0 开始，可选参数被视为序列名称，返回值是为提供的序列名称最近添加的序列。 如果为 4.3 之后的版本提供了表名，lastInsertId 将返回空字符串。 仅在 SQL Server 2012 及更高版本中支持序列。

示例

<?php
$server = "myserver";
$databaseName = "mydatabase";
$uid = "myusername";
$pwd = "mypasword";

try {
    $conn = new PDO("sqlsrv:Server=$server;Database=$databaseName", $uid, $pwd);
    
    // One sequence, two tables
    $tableName1 = 'seqtable1';
    $tableName2 = 'seqtable2';
    $sequenceName = 'sequence1';

    $stmt = $conn->query("IF OBJECT_ID('$sequenceName', 'SO') IS NOT NULL DROP SEQUENCE $sequenceName");
    $sql = "CREATE TABLE $tableName1 (seqnum INTEGER NOT NULL PRIMARY KEY, SomeNumber INT)";
    $stmt = $conn->query($sql);
    $sql = "CREATE TABLE $tableName2 (ID INT IDENTITY(1,2), SomeValue char(10))";
    $stmt = $conn->query($sql);

    $sql = "CREATE SEQUENCE $sequenceName AS INTEGER START WITH 1 INCREMENT BY 1 MINVALUE 1 MAXVALUE 100 CYCLE";
    $stmt = $conn->query($sql);

    $ret = $conn->exec("INSERT INTO $tableName1 VALUES( NEXT VALUE FOR $sequenceName, 20)");
    $ret = $conn->exec("INSERT INTO $tableName1 VALUES( NEXT VALUE FOR $sequenceName, 40)");
    $ret = $conn->exec("INSERT INTO $tableName1 VALUES( NEXT VALUE FOR $sequenceName, 60)");
    $ret = $conn->exec("INSERT INTO $tableName2 VALUES( '20' )");
    
    // return the last sequence number if sequence name is provided
    $lastSeq1 = $conn->lastInsertId($sequenceName);
    
    // defaults to $tableName2 -- because it returns the last inserted id value
    $lastRow = $conn->lastInsertId();
        
    // providing a table name in lastInsertId should return an empty string
    $lastSeq2 = $conn->lastInsertId($tableName2);
    
    echo "Last sequence number = $lastSeq1\n";
    echo "Last inserted ID     = $lastRow\n";
    echo "Last inserted ID when a table name is supplied = $lastSeq2\n";

    // One table, two sequences    
    $tableName = 'seqtable';
    $sequence1 = 'sequence1';
    $sequence2 = 'sequenceNeg1';
    $stmt = $conn->query("IF OBJECT_ID('$sequence1', 'SO') IS NOT NULL DROP SEQUENCE $sequence1");
    $stmt = $conn->query("IF OBJECT_ID('$sequence2', 'SO') IS NOT NULL DROP SEQUENCE $sequence2");
    $sql = "CREATE TABLE $tableName (ID INT IDENTITY(1,1), SeqNumInc INTEGER NOT NULL PRIMARY KEY, SomeNumber INT)";
    $stmt = $conn->query($sql);
    $sql = "CREATE SEQUENCE $sequence1 AS INTEGER START WITH 1 INCREMENT BY 1 MINVALUE 1 MAXVALUE 100";
    $stmt = $conn->query($sql);

    $sql = "CREATE SEQUENCE $sequence2 AS INTEGER START WITH 200 INCREMENT BY -1 MINVALUE 101 MAXVALUE 200";
    $stmt = $conn->query($sql);
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence1, 20 )");
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence2, 180 )");
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence1, 40 )");
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence2, 160 )");
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence1, 60 )");
    $ret = $conn->exec("INSERT INTO $tableName VALUES( NEXT VALUE FOR $sequence2, 140 )");
    
    // return the last sequence number of 'sequence1'
    $lastSeq1 = $conn->lastInsertId($sequence1);

    // return the last sequence number of 'sequenceNeg1'
    $lastSeq2 = $conn->lastInsertId($sequence2);

    // providing a table name in lastInsertId should return an empty string
    $lastSeq3 = $conn->lastInsertId($tableName);
    
    echo "Last sequence number of sequence1    = $lastSeq1\n";
    echo "Last sequence number of sequenceNeg1 = $lastSeq2\n";
    echo "Last sequence number when a table name is supplied = $lastSeq3\n";

    $stmt = $conn->query("DROP TABLE $tableName1");
    $stmt = $conn->query("DROP TABLE $tableName2");
    $stmt = $conn->query("DROP SEQUENCE $sequenceName");
    $stmt = $conn->query("DROP TABLE $tableName");
    $stmt = $conn->query("DROP SEQUENCE $sequence1");
    $stmt = $conn->query("DROP SEQUENCE $sequence2");
    
    unset($stmt);
    unset($conn);
} catch (Exception $e) {
    echo "Exception $e\n";
}

?>

预期的输出为：

Last sequence number = 3
Last inserted ID     = 1
Last inserted ID when a table name is supplied =

Last sequence number of sequence1    = 3
Last sequence number of sequenceNeg1 = 198
Last sequence number when a table name is supplied =

另请参阅

PDO 类

PDO