为什么给 mysqli_query 时换行符消失了？

Question

当我将它粘贴到相关数据库的 phpmyadmin 查询 window 中时，这个用于插入触发器的查询有效。但是当我尝试使用 mysqli_query 将它查询到数据库时，换行符似乎消失了导致它失败。

代码：

$TriggerQwry = 'Delimiter $$

                DROP TRIGGER IF EXISTS sign_chat;

    $$

    CREATE TRIGGER sign_chat BEFORE INSERT ON dark_taigachat FOR EACH ROW BEGIN

    IF (INSTR(NEW.message,"(") != 1) THEN

    SET NEW.message = CONCAT("(MC) ", NEW.message);

    END IF ;

    END ;';

    $DBConnect = mysqli_connect("localhost", "root", "************");
        mysqli_set_charset($DBConnect, "utf8");
        mysqli_select_db($DBConnect, 'minecraft_xenforo');                          

        $QueryResult = mysqli_query($DBConnect, $TriggerQwry);
        if($QueryResult) 
        {
            $result = mysqli_affected_rows($DBConnect);
        }
        else 
        {
            $result = 0; 
            echo "<p>Unable to execute the query.[".$TriggerQwry."]</p>" 
            . "<p>Error code " . mysqli_errno($DBConnect)
            . ": " . mysqli_error($DBConnect) . "</p>";
        }
        echo "Result[$Result]";
        mysqli_close($DBConnect);

输出：

Unable to execute the query.[Delimiter $$ DROP TRIGGER IF EXISTS sign_chat; $$ CREATE TRIGGER sign_chat BEFORE INSERT ON dark_taigachat FOR EACH ROW BEGIN IF (INSTR(NEW.message,"(") != 1) THEN SET NEW.message = CONCAT("(MC) ", NEW.message); END IF ; END ;]

Error code 1064: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'Delimiter $$ DROP TRIGGER IF EXISTS sign_chat; $$ CREATE ' at line 1

我还尝试在 TriggerQwry 字符串上使用全引号 "" 和 \n 以及 \n\r 和 \r\n，但结果都相同。

这是怎么回事？！

Answer 1

您实际上是在尝试使用 MySQLi 的 multi_query，但是 MySQLi 不处理定界符。您应该将两个查询分开，这样您就不需要分隔符。

尝试：

<?php
$DBConnect = mysqli_connect("localhost", "root", "************");
mysqli_set_charset($DBConnect, "utf8");
mysqli_select_db($DBConnect, 'minecraft_xenforo'); 

$sql = "DROP TRIGGER IF EXISTS sign_chat";
$DBConnect->query($sql);

$sql = "
CREATE TRIGGER sign_chat BEFORE INSERT ON dark_taigachat 
  FOR EACH ROW BEGIN
    IF (INSTR(NEW.message,"(") != 1) THEN
        SET NEW.message = CONCAT("(MC) ", NEW.message);
    END IF ;
  END
";
$DBConnect->query($sql);

为什么给 mysqli_query 时换行符消失了？

Why do the line breaks dissapear when given to mysqli_query?

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