插入值表，如果行不存在

Question

我有數據庫，在mysql中保存我的數據。 我已經有數據在我的表（呼叫字），我想插入新的數據到這張表，但在我想檢查這個數據是否不存在之前。 我有功能，插入數據表，但我需要sql查詢，將檢查數據不存在？ 我的表'詞'中的列是：單詞，數字，命中，instoplist。 我用PHP編寫的代碼

感謝，

這是我的代碼：（插入到表函數）

function insert($myWords) 
    { 
     global $conn; 
     $temp1 = $value['document']; 
     $temp2 = $value['word']; 

      $sql = "INSERT INTO words (word,num,hit,instoplist) VALUES"; 
      foreach ($myWords as $key => $value) { 
       $word = $value['word']; 
       $number = $value['document']; 
       $hit = $value['hit']; 
       $stop = $value['stopList'];   
       $sql .= "('$word', '$number', '$hit','$stop'),";     
      } 
      $sql = rtrim($sql,','); //to remove last comma 
      if($conn->query($sql)!== TRUE) 
      { 
         echo "error". $conn->error; 
      } 
    } 

Answer 1

插入數據做出一列是作爲唯一一個選擇查詢之前按您的要求，如：

$chkExist = "select id from table where col_name = '".$value."'"; 
$res = $conn->query($chkExist); 

// Now check if there is some record in $res than stop the entry otherwise insert it 

Answer 2

$sel="select * from words where word = '$word' AND document = '$document' AND hit = '$hit' AND stopList ='$stopList'"; 
    $qry=mysqli_query($sel); 
    $num=mysqli_num_rows($qry); 
if($num==0){ 
    $sql = "INSERT INTO words (word,num,hit,instoplist) VALUES"; 
     foreach ($myWords as $key => $value) { 
      $word = $value['word']; 
      $number = $value['document']; 
      $hit = $value['hit']; 
      $stop = $value['stopList'];   
      $sql .= "('$word', '$number', '$hit','$stop'),";     
     } 
     $sql = rtrim($sql,','); 
    }else{ 
     echo "Already Exist"; 
    } 

Answer 3

function insert($myWords) 
{ 
    global $conn; 
    $temp1 = $value['document']; 
    $temp2 = $value['word']; 

     $sql = "INSERT INTO words (word,num,hit,instoplist) VALUES"; 
     foreach ($myWords as $key => $value) { 
      $sql2 "SELECT * FROM words WHERE word = '".$value['word']."' OR num = '".$value['document']."'"; //other data if you want 
      $resultat=mysql_query($query); 
      if($resultat==""){ 
       $word = $value['word']; 
       $number = $value['document']; 
       $hit = $value['hit']; 
       $stop = $value['stopList'];   
       $sql .= "('$word', '$number', '$hit','$stop'),"; 
      }    
     } 
     $sql = rtrim($sql,','); //to remove last comma 
     if($conn->query($sql)!== TRUE) 
     { 
        echo "error". $conn->error; 
     } 
}