Question

我需要更新整个数据库中的列值。包含特定字符串（例如，clie_id列中的id）的所有列都必须具有大写的值。换句话说，所有ID都必须大写。我知道如何对单个表执行此操作，但是有没有办法对所有表执行此操作？好吧，看来现在一切都很好。我对嵌套循环有问题。我需要执行类似$ s3 = $ s1 + $ s2的操作来获取一个查询，但是我似乎无法正确执行。代码更新。我必须在屏幕上打印：UPDATE'tablename'SET'columnname'= UPPER（columnname）或如果同一表中有多个列UPDATE'tablename'SET'columnname'= UPPER（columnname），'columnname1'= UPPER （columnname1）等。谢谢！

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "tabledb";

try {

    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    //get table names
    $sqlTables = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
                    WHERE TABLE_SCHEMA= 'tabledb'";             
    //get column names  
    $sqlColumns = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS
                    WHERE COLUMN_NAME LIKE '%UUID%'";
    // Prepare statement
    $stmtTables = $conn->prepare($sqlTables);
    $stmtColumns = $conn->prepare($sqlColumns);
    // execute the query
    $stmtTables->execute();
    $stmtColumns->execute();

    while ($rowTables = $stmtTables->fetchAll(PDO::FETCH_NUM) AND ($rowColumns=$stmtColumns->fetchAll(PDO::FETCH_NUM))) {
        $tables = $rowTables;
        $columns = $rowColumns;         
    }

    foreach($tables as $table){
        foreach ($table as $val) {
            $s1 = "UPDATE ".$val.", <br>";
            print_r($s1);
        }
    }   
        foreach($columns as $column) {
            foreach ($column as $val2) {
                $s2 = "SET ".$val2." = UPPER ($val2), <br> ";
                print_r($s2);
            }
        }

    }

    catch(PDOException $e)
    {
        echo $sql . "<br>" . $e->getMessage();
    }

    $conn = null;
?>

Answer 1

首先，您需要使用以下查询获取所有表

SELECT table_name FROM information_schema.tables where table_schema='your_database_name';

即

$tables = "SELECT table_name FROM information_schema.tables where table_schema='DBNAME'";
echo'<pre>';print_r($tables);
foreach ($tables as $table) {
        $columns = "SELECT COLUMN_NAME FROM information_schema.columns WHERE table_schema='DBNAME' AND table_name='".$table->table_name."'";
        echo'<pre>';print_r($columns);die;
        foreach($columns as $column){
           //Be careful with this
           //$this->db->query("UPDATE ".$table->table_name." SET ".$column->COLUMN_NAME." = UPPER(".$column->COLUMN_NAME.")");
        }
}

更新后的代码，请替换您的DBNAME，请小心我在这里使用对象数组的数组

如何使用php脚本更新所有表中的所有列值？

1 个答案: