在服务器端进行双 WHERE 查询以创建 jqgrid json

Question

我使用服务器端在 jqgrid 上创建 json。

我的问题是当我想在 mySQL 查询中包含 WHERE 时，因为 WHERE 已用于搜索运算符。

• 服务器端代码是

  <?php 
  
  include("dbconfig.php");
  $page = $_REQUEST['page']; 
  $limit = $_REQUEST['rows']; 
  $sidx = $_REQUEST['sidx']; 
  $sord = $_REQUEST['sord']; 
  
  // if we not pass at first time index use the first column for the index or what you want
  if(!$sidx) $sidx =1; 
  
  //array to translate the search type
  $ops = array(
      'eq'=>'=', //equal
      'ne'=>'<>',//not equal
      'lt'=>'<', //less than
      'le'=>'<=',//less than or equal
      'gt'=>'>', //greater than
      'ge'=>'>=',//greater than or equal
      'nc'=>'NOT LIKE'  //doesn't contain
  );
  function getWhereClause($col, $oper, $val){
      global $ops;
      if($oper == 'bw' || $oper == 'bn') $val .= '%';
      if($oper == 'ew' || $oper == 'en' ) $val = '%'.$val;
      if($oper == 'cn' || $oper == 'nc' || $oper == 'in' || $oper == 'ni') $val = '%'.$val.'%';
      return " WHERE $col {$ops[$oper]} '$val' ";
  }
  $where = ""; //if there is no search request sent by jqgrid, $where should be empty
  $searchField = isset($_GET['searchField']) ? $_GET['searchField'] : false;
  $searchOper = isset($_GET['searchOper']) ? $_GET['searchOper']: false;
  $searchString = isset($_GET['searchString']) ? $_GET['searchString'] : false;
  if ($_GET['_search'] == 'true') {
      $where = getWhereClause($searchField,$searchOper,$searchString);
  //  var_dump($where);
  
  }
  
   $totalrows = isset($_REQUEST['totalrows']) ? $_REQUEST['totalrows']: false;
  if($totalrows) {
      $limit = $totalrows;    
  }
  
  $db = mysql_connect($dbhost, $dbuser, $dbpassword) or die("Connection Error: " . mysql_error()); 
  mysql_select_db($database) or die("Error connecting to db."); 
   if ($limit<0) $limit = 0;
  // calculate the number of rows for the query. We need this for paging the result 
  $result = mysql_query("SELECT * FROM enemy_coords"); 
  $row = mysql_fetch_array($result,MYSQL_ASSOC); 
  $count = $row['count']; 
          if( $count >0 ) {
              $total_pages = ceil($count/$limit);
          } else {
              $total_pages = 0;
          }
          if ($page > $total_pages) $page=$total_pages;
          $start = $limit*$page - $limit; // do not put $limit*($page - 1)
          if ($start<0) $start = 0;
  
  // the actual query for the grid data 
  $SQL = "SELECT * FROM enemy_coords ".$where." ORDER BY $sidx $sord LIMIT $start , $limit"; 
  $result = mysql_query( $SQL ) or die("Couldn't execute query.".mysql_error()); 
  
  $responce->page = $page;
  $responce->total = $total_pages;
  $responce->records = $count;
  $i=0;
  while($row = mysql_fetch_array($result,MYSQL_ASSOC)) {
      $responce->rows[$i]['id']=$row[ID];
      $responce->rows[$i]['cell']=array($row[ID],$row[ID],$row[alliance_name],$row[player_name],$row[player_lvl],$row[player_might],$row[city1_coords]);
      $i++;
  }        
  
  echo json_encode($responce);
  ?>
  

我的问题是我是否将 mysql 查询更改为

SELECT * FROM enemy_coords WHERE category <> 'A',
where should i put the "WHERE category = 'A'"?

Answer 1

这里有很多选择。一种可能的方法是将初始 $where 设置为此条件，然后根据您的要求在搜索打开时为其余位置添加 AND 或 OR。为了执行此操作，应从 getWhereClause 函数中删除 WHERE 运算符：

function getWhereClause($col, $oper, $val){
    global $ops;
    if($oper == 'bw' || $oper == 'bn') $val .= '%';
    if($oper == 'ew' || $oper == 'en' ) $val = '%'.$val;
    if($oper == 'cn' || $oper == 'nc' || $oper == 'in' || $oper == 'ni') $val = '%'.$val.'%';
    return " $col {$ops[$oper]} '$val' ";
}
$where = "WHERE category = 'A'"; 
...
if ($_GET['_search'] == 'true') {
    $where = $where. " AND ". getWhereClause($searchField,$searchOper,$searchString);
//  var_dump($where);

}
...
// the actual query for the grid data 
$SQL = "SELECT * FROM enemy_coords ".$where." ORDER BY $sidx $sord LIMIT $start , $limit"; 
$result = mysql_query( $SQL ) or die("Couldn't execute query.".mysql_error()); 

当然，为了做到这一点，还需要执行更多的检查条件，但这只是一个方向。