sql - 使用函数语法的准备语句

Question

当我尝试运行此命令时遇到错误:

mysql> prepare stmt1 from "UPDATE test.users SET password = password('?') WHERE usrid = ?";
mysql> prepare stmt1 from "UPDATE test.users SET password = password(?) WHERE usrid = ?";

如何制作一个准备好的语句，其中函数将我的变量作为参数？

Answer 1

您需要在准备好的声明周围添加一些双引号:

mysql> PREPARE stmt_name FROM "SELECT name FROM Country WHERE code = ?";
Query OK, 0 rows affected (0.09 sec)
Statement prepared

mysql> SET @test_parm = "FIN";
Query OK, 0 rows affected (0.00 sec)

mysql> EXECUTE stmt_name USING @test_parm;
+---------+
| name    |
+---------+
| Finland |
+---------+
1 row in set (0.03 sec)

mysql> DEALLOCATE PREPARE stmt_name;
Query OK, 0 rows affected (0.00 sec)