PHP database comparison tool sharing

This article mainly shares with you the PHP database comparison tool. Version iteration requires comparing different versions of databases and writing upgrade scripts for lower version databases. Use PHP to write a database comparison tool. It took a day without using php.

Function: Compare two different versions of databases src and dst, generate SQL files to upgrade src to dst

>，表的属性值function getDBStructure($db_name,$pdo,&$tables,&$db_stru,&$table_status){
    # code...
    //获取SRC_DB 的数据库结构
    $pdo->query("use ".$db_name);
    print_r("
");    //表属性
    foreach ($pdo->query("show table status") as $key => $value) {        # code...
        $table_status[$value[0]] = $value;

    }    //echo PHP_EOL;

    foreach ($pdo->query("show tables") as $key => $value) {        # code...
        $tables[$key] = $value[0];//表名
        //echo $value[0]."|";
    }    //echo PHP_EOL;
    foreach ($tables as $key => $name) {        # code...
        //echo $name .PHP_EOL;
        $table = null;//记得初始化
        foreach ($pdo->query("desc ".$name) as $key => $value) {            # code...
            $table[$value[0]] = $value; //字段名 ——> 字段属性
            //echo $value[0] ."|";
        }        //echo PHP_EOL;
        $db_stru[$name] = $table; //表名 -> 表结构
    }

}//生成创建数据库的sql// 表名  表结构function createTableSQl($name,$table){
    # code...
    $pri_key =  array();    $mul_key =  array();    $sql = "CREATE TABLE `{$name}` (";    foreach ($table as $key => $value) {        # code...
        $field = $value[0];//字段名
        $type = $value[1]; //字段类型
        $null = $value[2]; //是否为空 YES NO
        $key = $value[3]; //PRI MUL
        $default = $value[4]; //字段类型 
        $extal = $value[5];//
        $isNUll = "";        if ($null == "YES") {            # code...
            $isNUll = "not null";
        }        //$defaultMsg = $default;
        if (!is_null($default)) {            # code...
            $default = " default {$default}";
        }        if ($key == "PRI") {            # code...
            array_push($pri_key, $field);
        }        else if ($key == "MUL") {            # code...
            array_push ($mul_key, $field);
        }        //拼接字符串
        $row = "`{$field}` {$type} {$isNUll} {$default},";        $sql = $sql . PHP_EOL . $row  ;
    }    //添加主键
    if (!empty($pri_key)) {    # code...

        $sql = $sql . PHP_EOL."PRIMARY KEY (";        foreach ($pri_key as $v) {            # code...
            $sql = $sql."`{$v}`,";
        }        $sql = substr($sql, 0,strlen($sql)-1);        $sql = $sql . ")," ;
    }        //拼接主键
    if (!empty($mul_key)) {        # code...

        foreach ($mul_key as  $v) {            # code...
            $sql = $sql . PHP_EOL . "key `{$v}` ({$v}),";
        }
    }    $sql = substr($sql, 0,strlen($sql)-1);//去掉最后一个‘，’

    $sql = $sql . PHP_EOL . ");".PHP_EOL;    return $sql;
}//生成update文件// $fields //ALTER TABLE `familyer`  ADD COLUMN   `joinfightdata` blob AFTER `ssfightblob`;function genUpdateSQL($fields){
    $updateSql=null ;    foreach ($fields as $tab_name => $value) {        # code...
        foreach ($value as $key => $v) {            # code...
            $isNUll = "";            if ($v[2] == "YES") {                # code...
                $isNUll = "NOT NULL";
            }            $default = $v[4];            if (!is_null($default)) {                # code...
                $default = " default {$default}";
            }            $updateSql = $updateSql . "ALTER TABLE `{$tab_name}` ADD COLUMN `{$v[0]}` {$v[1]} {$isNUll} {$default};".PHP_EOL;
        }        $updateSql = $updateSql.PHP_EOL;
    }    return $updateSql;
}//比价数据库结构//dst_db 有 src_db 没有 返回表字段数组function cmp($src_db,$dst_db){
    $tables =array();//dst有 但是src中没有的表 
    $fields = array();//表名 -> <字段名，字段属性>
    foreach ($dst_db as $key => $value) {        # code...
        if ( array_key_exists($key,$src_db) ) {//如果存在比较字段
            # code...
            $tmp = array_diff_key($value,$src_db[$key]);            if ( !empty($tmp) )  {                # code...
                $fields[$key]=$tmp;
            }
        }        else
            array_push($tables,$key);
    }    return $fields;
}$pdo = new PDO(DSN, USER, PASS);//创建数据库链接//源数据库结构$src_tables= NULL;//表名数组$src_db = NULL;    //数据库结构 表名->表字段$src_table_status = NULL; //表属性 name -> 属性getDBStructure(SRC_DB,$pdo,$src_tables,$src_db,$src_table_status);//目的数据库结构$dst_tables =NULL;$dst_db=null;$dst_table_status=null;
getDBStructure(TARGET_DB,$pdo,$dst_tables,$dst_db,$dst_table_status);$cmp_table = array_diff($dst_tables,$src_tables);$cmp_fields = cmp($src_db,$dst_db);//print_r($cmp_table);$text = null;foreach ($cmp_table as  $value) {    # code...
    if ( !strchr($value,"pvprankreward") ) {        # code...
        $text = $text.createTableSQl($value,$dst_db[$value]);
    }

}$text = $text . genUpdateSQL($cmp_fields);$myfile = fopen(FILE_NAME,"w");
fwrite($myfile, $text);
fclose($myfile);//对比数据库结构 返回差异 表//cmp($dst_db,$src_db);//对比表结构返回有差异的表//$str = createTableSQl($src_tables[0],$src_db[$src_tables[0]]);//$myfile = fopen("SQL.sql","w");//fwrite($myfile, $str);//fclose($myfile);// print_r("
");//print_r($src_db["pvprankreward170525"]);//print_r($src_table_status["role"]);?>
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