Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL
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2024-03-14 08:51:52
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Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘username=’**’’ at line 1
从报错信息能看出原因是出在我们书写sql语句时,没有编写规范,导致读取运行映射配置文件sqlMapper出现错误,导致失败。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.UserMapper">
<select id="findByCondition" parameterType="com.itheima.domain.User" resultType="com.itheima.domain.User">
select * from user where id=#{id}and username=#{username};
</select>
</mapper>
经过仔细核查发现发现select * from user where id=#{id}and username=#{username};缺少空格
修改后
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.UserMapper">
<select id="findByCondition" parameterType="com.itheima.domain.User" resultType="com.itheima.domain.User">
select * from user where id=#{id} and username=#{username};
</select>
</mapper>
运行成功
成功读取数据库表中Data
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