mysql使用pdo简单封装select语句

最终代码：

 function pdo_array_query($pdo, $table_name, $data, $fields=array('*')){
     //Will contain SQL snippets.
     $rows_sql = array();
     //Will contain the values that we need to bind.
     $to_bind = array();
     //Get a list of column names to use in the SQL statement.
     $codition_array = array();

     $codition_string = "";

     foreach($data as $column_name => $column_value){
         $codition_array[] = $column_name.' = :'.$column_name;
         $param = ":" . $column_name;
         $to_bind[$param] = $column_value;
     }
     $codition_string = implode(" and ", $codition_array);
     $fields_string = implode(", ", $fields);

     $sql = "SELECT $fields_string FROM `$table_name` WHERE ".$codition_string;    

     //Prepare our PDO statement.
     $pdo_statement = $pdo->prepare($sql);

     foreach($to_bind as $param => $val){
         $pdo_statement->bindValue($param, $val);
     }
     // return $pdo_statement->execute();
     $pdo_statement->execute();
     $result = $pdo_statement->fetchAll();
     return $result;
     //print_r($result);
 }

用法：

    $pdo = get_mysql_connect(); // 自定义 获取pdo实例的方法
    $table_name = 'order'; // 表名
    $fields = array("idproduct", "email", "customer", "address");// 需要查询的字段
    $data = array(
        "idpayment"=>"1270117360-13027-963488",
        "name"=>"John",
        "age"=>"28",
        "sex"=>"boy",
    ); // 查询的条件
    pdo_array_query($pdo, $table_name, $data, $fields);

拼合后的 sql 如下：

SELECT idproduct, email, customer, address FROM `order` WHERE idpayment = :idpayment and name = :name and age = :age and sex = :sex

升级版：
       由于上面的方法，只能处理条件为 and 的情况，所以新方法增加了能添加 逻辑数组的 参数，具体代码如下：

 function pdo_array_query($pdo, $table_name, $data, $fields=array('*'), $operators=array('and')){
         //Will contain SQL snippets.
         $rows_sql = array();
         //Will contain the values that we need to bind.
         $to_bind = array();
         //Get a list of column names to use in the SQL statement.
         $condition_array = array();
         $condition_string = "";

         foreach($data as $column_name => $column_value){
             $condition_array[] = $column_name.' = :'.$column_name;
             $param = ":" . $column_name;
             $to_bind[$param] = $column_value;
         }
         // $codition_string = implode(" and ", $codition_array);
         if (count($operators) == 1 ) {
             $condition_string = implode(' '.$operators[0].' ', $condition_array);
         }
         // the operators should less one than condition_array
         else if (count($condition_array) - count($operators) == 1){
             $result = cross_merge_array($condition_array, $operators);
             $condition_string = implode(' ', $result);
         }   

         $fields_string = implode(", ", $fields);

         $sql = "SELECT $fields_string FROM `$table_name` WHERE ".$condition_string;    

         echo $sql;
         //Prepare our PDO statement.
         $pdo_statement = $pdo->prepare($sql);
         foreach($to_bind as $param => $val){
             $pdo_statement->bindValue($param, $val);
         }
         $pdo_statement->execute();
         $result = $pdo_statement->fetchAll();
         print_r($result);
         //return $pdo_statement->rowCount();
     }

为了合理起见，关系数组 应该是要比 字段数组 少 1，如：

idpayment = :idpayment and name = :name or age = :age and sex = :sex
 关系数组是： array('and', 'or', 'and')  长度为3
 字段数组是： array('idpayment', 'name', 'age', 'sex') 长度为 4

数组交叉合并的方法： 也可参考 http://www.cnblogs.com/tommy-huang/p/9050161.html

  function cross_merge_array($arr1, $arr2)
     {
         $arr1 = array_values($arr1);
         $arr2 = array_values($arr2);
         $count = max(count($arr1), count($arr2));
         $arr = array();

         for ($i = 0; $i < $count; $i++) {
             if ($i < count($arr1)) {
                 $arr[] = $arr1[$i];
             }

             if ($i < count($arr2)) {
                 $arr[] = $arr2[$i];
             }
         }
         return $arr;
     }

用法：

    $pdo = get_mysql_connect(); // 自定义 获取pdo实例的方法
    $table_name = 'order'; // 表名
    $fields = array("idproduct", "email", "customer", "address");// 需要查询的字段
    $data = array(
        "idpayment"=>"1270117360-13027-963488",
        "name"=>"John",
        "age"=>"28",
        "sex"=>"boy",
    ); // 查询的条件
    $operators = array(
        'and',
        'or',
        'and',
    );

    pdo_array_query($pdo, $table_name, $data, $fields, $operators);