PHP PDO插入批量记录或更新(如果存在)

Question

我有这个代码,可以在一个查询中插入多行.

我不想做的是,如果colA已经存在于数据库更新colB中.

我已经看过使用INSERT ON DUPLICATE KEY UPDATE,但我只能看到它在一行中工作,我可以有1000行.

如何在代码上使用INSERT/UPDATE？

$sql = 'INSERT INTO table (colA, colB, colC, colD, colE) VALUES';
$insertQuery = array();
$insertData = array();
$n = 0;
// and loop through the array binding values from each row
// to the placeholders before execution
// placeholders names increment starting at 0 to array length
foreach ($rows as $row) {
    $insertQuery[] = '(
        :colA' . $n . ',
        :colB' . $n . ',
        :colC' . $n . ',
        :colD' . $n . ',
        :colE' . $n . '
    )';

    $insertData['colA' . $n] = $row['colA'];
    $insertData['colB' . $n] = $row['colB'];
    $insertData['colC' . $n] = $row['colC'];
    $insertData['colD' . $n] = $row['colD'];
    $insertData['colE' . $n] = $row['load_note'];
    $insertData['last_updated' . $n] = $row['colE'];
    $n++;
}

// prepare the query and exeute it
if (!empty($insertQuery)) {
    $sql .= implode(', ', $insertQuery);
    $stmt = $db->prepare($sql);
    $stmt->execute($insertData);
}

编辑:

如何更新多列？它是否正确？

$sql .= " ON DUPLICATE KEY UPDATE status = VALUES(colB, colC)";

EDIT2:

我添加了这个,但我没有插入行(空表)

$sql .= " ON DUPLICATE KEY UPDATE colA = VALUES(colA), 
                  colB = VALUES(colB), 
                  colC = VALUES(colC), 
                  colD = VALUES(colD), 
                  colE = VALUES(colE))";

Answer 1

implode()通话结束后,添加:

$sql .= " ON DUPLICATE KEY UPDATE colB = VALUES(colB)";

假设colA有一个唯一键,那么每当该列已经存在时,这将从该行的那一行设置colB为new ,并保持所有其他列不变.colBINSERT

http://dev.mysql.com/doc/refman/5.5/en/insert-on-duplicate.html

它有以下示例,显示每个重复行是独立处理的.

INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6)
  ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);

该陈述与以下两个陈述相同:

INSERT INTO table (a,b,c) VALUES (1,2,3)
  ON DUPLICATE KEY UPDATE c=3;
INSERT INTO table (a,b,c) VALUES (4,5,6)
  ON DUPLICATE KEY UPDATE c=9;