Question

我需要以编程方式将表的所有值从一个数据库复制到另一个数据库。我非常喜欢使用php。我如何实现这一目标？

我找到了一个特定的代码：

$sql1 = "DELETE FROM Kunthanahali.justshawarma_aauth_groups;";
$result1 = $conn->query($sql1);

$sql2 = "INSERT INTO Kunthanahali.justshawarma_aauth_groups SELECT * FROM justshawarmapos.justshawarma_aauth_groups;";
$result2 = $conn->query($sql2);

此代码工作正常。但问题是我的数据库中有大约50个表。是否有办法截断第二个数据库并从第一个数据库创建表和复制值？

我知道phpmyadmin里面有一个选项。但我想以编程方式执行此操作。 我想实现这一点，因为我正在创建一个销售点系统，其中销售点系统存在于localhost中，并且分析在网站中在线查看。我需要定期将表及其数据复制到在线数据库。

Answer 1

您可以使用以下代码实现此目的 -

 <?php
$dblink1=mysql_connect('$ip1', '$user1', '$pass1'); // connect server 1

mysql_select_db('$database1',$dblink1);  // select database 1

$dblink2=mysql_connect('$ip2', '$user2', '$pass2'); // connect server 2 

mysql_select_db('$database2',$dblink2); // select database 2

$tables = mysql_fetch_array(mysql_query("SHOW TABLES  ",$dblink1));

//$table='tabletest';

foreach($tables as $table){

    $tableinfo = mysql_fetch_array(mysql_query("SHOW CREATE TABLE $table  ",$dblink1)); // get structure from table on server 1

    mysql_query(" $tableinfo[1] ",$dblink2); // use found structure to make table on server 2

    $result = mysql_query("SELECT * FROM $table  ",$dblink1); // select all content     

    while ($row = mysql_fetch_array($result, MYSQL_ASSOC) ) {       
       mysql_query("INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."')",$dblink2); // insert one row into new table
    }

}

 mysql_close($dblink1); 
 mysql_close($dblink2);

以下是mysqli版本 -

<?php
$dblink1=mysqli_connect('127.0.0.1', 'root', ''); // connect server 1

mysqli_select_db($dblink1,'pdb1');  // select database 1

$dblink2=mysqli_connect('127.0.0.1', 'root', ''); // connect server 2   

mysqli_select_db($dblink2,'pdb4'); // select database 2

$tables = mysqli_fetch_array(mysqli_query($dblink1,"SHOW TABLES  "));

//$table='tabletest';

foreach($tables as $table){

    $tableinfo = mysqli_fetch_array(mysqli_query($dblink1,"SHOW CREATE TABLE $table  ")); // get structure from table on server 1

    mysqli_query($dblink2," $tableinfo[1] "); // use found structure to make table on server 2

    $result = mysqli_query($dblink1,"SELECT * FROM $table  "); // select all content        

    while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {     
       mysqli_query($dblink2,"INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."')"); // insert one row into new table
    }

}

 mysqli_close($dblink1); 
 mysqli_close($dblink2);

Answer 2

在我看来，这不是实现这一目标的方法。完成整个数据库的方法是使用mysqldump命令编写脚本。要备份整个数据库，您可以执行以下操作：

mysqldump --databases yourdb --password=pw | mysql -u user --password=pw otherdb

您可能需要或想要各种选项和设置，详见this blog post。例如，如果将-h参数和远程主机的主机详细信息添加到命令的命令行mysql部分，这也可以在mysql服务器之间复制数据库。

编写脚本后，使用系统或exec从PHP运行此类脚本非常简单。

Answer 3

下面是在两个数据库之间迁移数据的代码，它检查表或列是否存在，否则创建它并插入或添加数据请注意，它不适用于大型数据库，并确保为目标数据库做好准备。

mysqli_select_db($dblink1,'db1');  // select database 1

$dblink2=mysqli_connect('127.0.0.1', 'root', ''); // connect server 2   

mysqli_select_db($dblink2,'db2'); // select database 2

$result = (mysqli_query($dblink1,"SHOW TABLES  "));
while ($row = mysqli_fetch_row($result)) {
    $tables[] = $row[0];
}
echo "Searching Table: ".$tables[0] ."<br>";
foreach ($tables as $i => $table){

    $val = mysqli_query($dblink2,"select 1 from $table  ");

    if($val !== FALSE) /***** table exists */
    {
        $structure1= get_colums($dblink1, $table);
        $structure2= get_colums($dblink2, $table);
        compare_colums($dblink1,$dblink2, $structure1, $structure2, $table );


        $result = mysqli_query($dblink1,"SELECT * FROM $table  "); // select all content        
        echo $table." Updating table.... "."<br>";
        $rowcount=mysqli_num_rows($result); 
        while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {     
            $update_string = update_query_format($row );

           mysqli_query($dblink2,"INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."') 
           ON DUPLICATE KEY UPDATE $update_string "); // insert one row into new table
        }
        echo $table." Updating table Completed.... total updated: $rowcount"."<br><br><br>"; 
    }
    else
    {
        /**** table not exists */
       echo $table." Table not found "."<br>";
       echo $table." Creating table... "."<br>";
       $tableinfo = mysqli_fetch_array(mysqli_query($dblink1,"SHOW CREATE TABLE $table  ")); // get structure from table on server 1
       mysqli_query($dblink2," $tableinfo[1] "); // use found structure to make table on server 2

       $result = mysqli_query($dblink1,"SELECT * FROM $table  "); // select all content        
       echo $table." Copying table.... "."<br><br><br>"; 
       while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {     
          mysqli_query($dblink2,"INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."')"); // insert one row into new table
       }
    }    


}
 mysqli_close($dblink1); 
 mysqli_close($dblink2);


 function compare_structure($table, $dblink1 , $dblink2){
            /***  Check if table exists */
            $val = mysqli_query($dblink2,"select 1 from $table  ");

            if($val !== FALSE) /***** table exists */
            {
                $structure1= get_colums($dblink1, $table);
                $structure2= get_colums($dblink2, $table);
                compare_colums($dblink1,$dblink2, $structure1, $structure2, $table );


                $result = mysqli_query($dblink1,"SELECT * FROM $table  "); // select all content        
                echo $table." Updating table.... "."<br>";
                $rowcount=mysqli_num_rows($result); 
                while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {     
                    $update_string = update_query_format($row );

                   mysqli_query($dblink2,"INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."') 
                   ON DUPLICATE KEY UPDATE $update_string "); // insert one row into new table
                }
                echo $table." Updating table Completed.... total updated: $rowcount"."<br><br><br>"; 
            }
            else
            {
                /**** table not exists */
               echo $table." Table not found "."<br>";
               echo $table." Creating table... "."<br>";
               $tableinfo = mysqli_fetch_array(mysqli_query($dblink1,"SHOW CREATE TABLE $table  ")); // get structure from table on server 1
               mysqli_query($dblink2," $tableinfo[1] "); // use found structure to make table on server 2

               $result = mysqli_query($dblink1,"SELECT * FROM $table  "); // select all content        
               echo $table." Copying table.... "."<br><br><br>"; 
               while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {     
                  mysqli_query($dblink2,"INSERT INTO $table (".implode(", ",array_keys($row)).") VALUES ('".implode("', '",array_values($row))."')"); // insert one row into new table
               }
            }

}

function get_colums($dblink, $table){
    $result = mysqli_query($dblink,"SHOW COLUMNS FROM $table ");
    $columns = [];           
    if (!$result) {
        echo 'Could not run query: ' . mysql_error();
        return [];
    }
    if (mysqli_num_rows($result) > 0) {
        while ($row = mysqli_fetch_assoc($result)) {
            $columns[$row['Field']] = $row['Type'];
        }
    }

    return $columns;

}

function compare_colums( $dblink1, $dblink2,  $structure1, $structure2, $table ){

    foreach ($structure2 as $field => $type){
        if (!array_key_exists($field,$structure2)){

            $result = mysqli_query($dblink2,"ALTER TABLE cus_tbl  ADD $field $type NOT NULL ");  
            if ($result){
                echo "Table: ". $table." New Field created ".$field. " ". $type. " .... "."<br>"; 
            }
        }

    }

}

function update_query_format($row){

    $query_format = "";
    foreach ($row as $k => $v){
        $query_format .= " ".$k. " = '". $v ."',"; 
    }
   // echo strlen($query_format);exit;
   // echo substr($query_format, 0,strlen($query_format)-1); exit;
    return substr($query_format, 0, strlen($query_format)-1);

}

如何使用PHP将所有表从一个数据库复制到另一个数据库？

3 个答案: