Question

我编写了一个需要将数据插入数据库的PHP代码，但我收到错误Object of class mysqli_result could not be converted to string in /opt/lampp/htdocs/SE1/insert.php on line 13。我不确定如何解决它。

这是php代码：

if(isset($_POST['submit'])){ // Fetching variables of the form which travels in URL
    $srn = $_POST['srn'];
    $company = $_POST['company'];
    $crn = mysqli_query($link,"select crn from company where name='$company'");
    $type = mysqli_query($link,"select typeofjob from company where name ='$company'");
        if($srn !=''||$company !=''){
            //Insert Query of SQL
            $query = mysqli_query($link,"insert into placement(srn, crn, typeofjob) values ('$srn', '$crn', '$type',)");
            echo "<br/><br/><span>Data Inserted successfully...!!</span>";
        }
        else{
            echo "<p>Insertion Failed <br/> Some Fields are Blank....!!</p>";
        }
}

以下是placement

的表格创建

CREATE TABLE `placement` (
  `srn` char(10) NOT NULL,
  `crn` int(11) NOT NULL,
  `typeofjob` int(11) NOT NULL,
  `tier` int(11) NOT NULL,
  `ctc` double NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

mysqli_query函数调用

$crn = mysqli_query($link,"select crn from company where name='$company'");

返回mysqli_result类型的对象，需要先读取/获取该对象，然后才能将其内容插入到另一个调用的数据库中。你的$ crn和$ type变量不是字符串，而是mysqli_result [s]。此外，只要您尝试从表格＆＃39; company＆＃39;中读取同一行的两列，就将它们合并为一个调用。

    $companyInfo = mysqli_query($link,'select crn, typejob from company where name="'. $company .'"');
    if($srn !='' || $company !=''){
        //Foreach company result row Insert Query of SQL
        while ($row = mysqli_fetch_array($companyInfo, MYSQL_ASSOC)) {
           $query = mysqli_query($link,'insert into placement(srn, crn, typeofjob) values ("'. $srn .'", "'. $row['crn'] .'", "'. $row['typejob'] .'")"');               
        }
        echo "<br/><br/><span>Data Inserted successfully...!!</span>";
    }
    else{
        echo "<p>Insertion Failed <br/> Some Fields are Blank....!!</p>";
    }

确保此步骤有效后，请注意SQL注入（阅读How can I prevent SQL injection in PHP?）和$ _POST验证

如何将数据从表单插入数据库？

1 个答案: