使用 PHP 在一个语句中执行多个 SQL 查询

问题描述

如何将这些多个查询合并为一个(我可以吗?)

How to join those multiple queries into one (can I?)

$query = "DELETE FROM aktywne_kody WHERE kodsms ='$kodSMSgracza' AND typkodu ='$id'";
mysql_query($query) or die(mysql_error());

$query = "INSERT INTO uzyte_kody (gracz, kodsms, typkodu) VALUES ('$nickGracza', '$kodSMSgracza', '$id')";
mysql_query($query) or die("Błąd MySQL X04");

$query = "INSERT INTO do_odebrania (gracz, itemDATA, itemQTY) VALUES ('$nickGracza', '$itemDATA', '$itemQTY')";
mysql_query($query) or die("Błąd MySQL X05");

顺便说一句，如果我在所有查询完成后执行 mysql_close($db) 会更好吗?

By the way is it better if I do mysql_close($db) after all queries are done?

推荐答案

将 65536 作为第 5 个参数传递给 mysql_connect.

Pass 65536 to mysql_connect as 5th parameter.

示例:

$conn = mysql_connect('localhost','username','password', true, 65536 /* here! */)
    or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    INSERT INTO table1 (field1,field2) VALUES(1,2);

    INSERT INTO table2 (field3,field4,field5) VALUES(3,4,5);

    DELETE FROM table3 WHERE field6 = 6;

    UPDATE table4 SET field7 = 7 WHERE field8 = 8;

    INSERT INTO table5
       SELECT t6.field11, t6.field12, t7.field13
       FROM table6 t6
       INNER JOIN table7 t7 ON t7.field9 = t6.field10;

    -- etc
");

当您使用 mysql_fetch_* 或 mysql_num_rows 或 mysql_affected_rows 时，只有第一条语句有效.

When you are working with mysql_fetch_* or mysql_num_rows, or mysql_affected_rows, only the first statement is valid.

比如下面的代码，第一条语句是INSERT，不能执行mysql_num_rows和mysql_fetch_*.用mysql_affected_rows返回插入的行数就可以了.

For example, the following codes, the first statement is INSERT, you cannot execute mysql_num_rows and mysql_fetch_*.It is okay to use mysql_affected_rows to return how many rows inserted.

$conn = mysql_connect('localhost','username','password', true, 65536) or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    INSERT INTO table1 (field1,field2) VALUES(1,2);
    SELECT * FROM table2;
");

再比如下面的代码，第一条语句是SELECT，不能执行mysql_affected_rows.但是你可以执行mysql_fetch_assoc得到第一条SELECT语句产生的key-value对行，或者你可以执行mysql_num_rows根据第一条SELECT语句得到行数.

Another example, the following codes, the first statement is SELECT, you cannot execute mysql_affected_rows. But you can execute mysql_fetch_assoc to get a key-value pair of row resulted from the first SELECT statement, or you can execute mysql_num_rows to get number of rows based on the first SELECT statement.

$conn = mysql_connect('localhost','username','password', true, 65536) or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");
mysql_query("
    SELECT * FROM table2;
    INSERT INTO table1 (field1,field2) VALUES(1,2);
");

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