第四节 -自己 DIY 一个数据库管理工具1.编写php服务器代码

if($tableName){
            
            $query = mysql_query("select COLUMN_NAME from information_schema.COLUMNS where  TABLE_NAME = '$tableName';") or die("<p style='color:red'>sql报错，错误信息为 ======> ".mysql_error()."</p>");
             
            //对结果集进行遍历 -- mysql_fetch_array
            
            
            $columns = array(); //储存这张表中所有的字段名称
            $count = 0; //记录当前的下标
            
            
            echo "<table>";
            
            echo "<tr>";
            
            while($row = mysql_fetch_array($query)){
                
                $columns[$count] =  $row["COLUMN_NAME"];
                
                echo "<td>" . $row["COLUMN_NAME"] . "</td>";
                
                $count = $count + 1;
                
            }
            
            echo "</tr>";
            
            //echo sizeof($columns);
            
            
            
            
            
            $query_02 = mysql_query($sql) or die("<p style='color:red'>sql报错，错误信息为 ======> ".mysql_error()."</p>");
            
            
            while($row = mysql_fetch_array($query_02)){
                
                echo "<tr>";
                for($i=0;$i<sizeof($columns);$i++){
                    echo "<td>" . $row[$columns[$i]] . "</td>";
                }
                echo "</tr>";
                
            }
            
            echo "</table>";
            
            
        }
        
    } 

<form action="mysqladmin.php" method="post" >

    <textarea cols="80" rows="10" id="sql" name="sql"></textarea>

    <br>

    <input type="submit" value="执行"  /> 

</form>

<style>

    th {background: #eaeaea}
    td {border:1px solid #ccc;padding:2px 10px;}
    tr:hover {background: skyblue}
</style>

<?php
    
    //1、连接数据库
    $conn = mysql_connect("localhost","root","");

    //2、选择test数据库
    $db = mysql_select_db("test",$conn);

    //3、设置编码集
    mysql_query("set names utf8");

    

    $sql = "";

    if(isset($_POST["sql"]) && $_POST["sql"] != null){
        $sql = $_POST["sql"];
        echo "<p>您执行的sql为：$sql </p>";   

        echo "<script>document.getElementById('sql').value='".$sql."'</script>";

        //开始真的执行sql

        $query_origin = mysql_query($sql) or die("<p style='color:red'>sql报错，错误信息为 ======> ".mysql_error()."</p>");

        echo "<p style='color:green'>执行成功！</p>";

        /*
            如果是update语句，则返回一个数字
            如果是select语句，则返回一个结果集，比如：Resource id #6
        */

        //echo $query;
        //echo strpos($query."",'Resource');


        //select COLUMN_NAME from information_schema.`COLUMNS` where TABLE_NAME = 'tm_users';
        
        //根据sql语句获取表名
        $arr = split(" ",$sql);
        $tableName = "";

        for($i=0;$i<sizeof($arr);$i++){
            if($arr[$i] == "from"){
                $tableName = $arr[$i+1];
                break;
            }
        }
        
        //echo $tableName;

        //如果表名存在，就去查询这个表中所有的字段
        if($tableName){
            $query = mysql_query("select COLUMN_NAME from information_schema.`COLUMNS` where TABLE_NAME = '$tableName'") or die("<p style='color:red'>sql报错，错误信息为 ======> ".mysql_error()."</p>");
            
            $columns = array();
            $count = 0;


            echo "<table cellpadding=0 cellspacing=0><tr>";

            while($row=mysql_fetch_array($query)){  
                
                $columns[$count++] = $row['COLUMN_NAME'];

            }   

            //遍历数组
            for($i=0;$i<sizeof($columns);$i++){
                echo "<th>$columns[$i]</th>";
            }

            echo "</tr><tr>";
            //然后去这张表里面查询
            while($row=mysql_fetch_array($query_origin)){
                //遍历这张表的列名，然后对应从行中取值
                for($i=0;$i<sizeof($columns);$i++){
                    echo "<td>" . $row["$columns[$i]"] . "</td>";
                }
                //每遍历好一行，就换行
                echo "</tr>";
            }

            echo "</table>";

        }



        

        

    }

    
?>