mybatis框架的搭建

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

<!-- 加载配置文件 ${}获取key的值 -->
<properties resource="db.properties"/>

<typeAliases>
<!--默认的别名的名称是 类的类名的首字母大写或是小写 User user -->
<package name="com.domain"/>
</typeAliases>

<!-- 配置mybatis的环境信息 -->
<environments default="development">
    <environment id="development">
        <!-- 配置JDBC事务控制，由mybatis进行管理 -->
        <transactionManager type="JDBC"></transactionManager>
        <!-- 配置数据源，采用dbcp连接池 -->
        <dataSource type="POOLED">
            <property name="driver" value="com.mysql.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/mydb2?useUnicode=true&amp;characterEncoding=utf8"/>
            <property name="username" value="root"/>
            <property name="password" value="root"/>
        </dataSource>
    </environment>
</environments>
<--批量加载mapper文件 -->
<mappers>
<package name="com.mapper"/>
</mappers>
</configuration>
</beans>

public class Test1 {
    
    public static void main(String[] args) throws IOException {
        //获取全局配置文件对应的对象
        InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
        //创建全局对象
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
        //开启会话
        SqlSession session = factory.openSession();
        //生成接口的代理对象来执行sql语句  userMapper代理对象
        // userMapper代理对象
        UserMapper userMapper = session.getMapper(UserMapper.class);
        List<User> allUsers = userMapper.getAllUsers();
        System.out.println(allUsers.get(0));
        //关闭会话
        session.close();
    }
}

<?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.mapper.UserMapper">
    <select id="getAllUsers" resultType="user">
        select user_name username from t_user
    </select>
    <!-- ? jdbc 占位符 #{}如果输入的参数是简单类型 名称任意 如果是pojo 取对应的java类的属性名 id 和接口的方法名一致 
        唯一的确定statementID parameterType 输入参数 执行sql语句需要的数据 要求对应的接口的方法的参数类型和它一致 java 
        resultType sql语句执行的返回的结果的java类型 要求对应的接口的方法的返回的java类型一致 -->

    <select id="getUserByUid" parameterType="int" resultType="com.domain.User">
        select
        * from t_user where uid = #{uid}
    </select>
    <!-- 根据用户的name模糊查询用户信息 ${} 不能防止sql注入，客户传递数据 取出用户的数据 ， 如果是简单类型 value 用的不多 
        like order by #{} 使用的比较多 -->
    <select id="getUserLikeName" parameterType="String" resultType="com.domain.User">
        select * from t_user where username like ‘%${value}%‘
    </select>
    <!--根据用户名模糊查询和根据性别查询 -->
    <select id="getUserByUser" parameterType="com.domain.User"
        resultType="com.domain.User">
        select * from t_user where username like ‘%${username}%‘
        and gender =
        #{gender}
    </select>
    <delete id="deleteUserByUid" parameterType="int">
        delete from t_user
        where uid = #{uid}
    </delete>
    <!-- 跟新用户信息 -->
    <update id="updateUserByUid" parameterType="com.domain.User">
        UPDATE t_user
        SET
        username = #{username},
        phone = #{phone}
        WHERE
        uid = #{uid}
    </update>
    <!-- 添加用户 -->
    <insert id="insertUser" parameterType="com.domain.User">
        insert into t_user
        (uid ,
        username , password,gender)
        values
        (null,#{username},#{password},#{gender})
    </insert>

    <select id="getCountUser" resultType="int">
        select count(*) from t_user
    </select>

</mapper>

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/big?useUnicode=true&characterEncoding=utf8
db.username=root
db.password=1234