SSM学习笔记 ——Spring纯注解整合Mybatis教程

前言

最近在学习SSM，刚好学习到Spring整合Mybatis了，随后网上大部分教程讲的都是通过 XML注解方式进行整合，但是让我一个 注解用习惯的开发者不是很愉快，随后特地写下该文章，防止各位花费大量时间踩坑

准备工作

Maven导入相关坐标

    <dependencies>
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.32version>
        dependency>
        
        <dependency>
            <groupId>com.mchangegroupId>
            <artifactId>c3p0artifactId>
            <version>0.9.5.2version>
        dependency>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>5.3.18version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>5.3.10version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webartifactId>
            <version>5.3.10version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>5.3.10version>
        dependency>
        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>3.0.1version>
            <scope>providedscope>
        dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.coregroupId>
            <artifactId>jackson-coreartifactId>
            <version>2.12.5version>
        dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.coregroupId>
            <artifactId>jackson-databindartifactId>
            <version>2.12.5version>
        dependency>
        <dependency>
            <groupId>javax.servlet.jspgroupId>
            <artifactId>javax.servlet.jsp-apiartifactId>
            <version>2.2.1version>
            <scope>providedscope>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-coreartifactId>
            <version>5.3.18version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-jdbcartifactId>
            <version>5.3.18version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.20version>
        dependency>

        <dependency>
            <groupId>commons-iogroupId>
            <artifactId>commons-ioartifactId>
            <version>2.6version>
        dependency>

        <dependency>
            <groupId>commons-fileuploadgroupId>
            <artifactId>commons-fileuploadartifactId>
            <version>1.4version>
        dependency>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>compilescope>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-aopartifactId>
            <version>5.3.18version>
        dependency>

        <dependency>
            <groupId>org.aspectjgroupId>
            <artifactId>aspectjweaverartifactId>
            <version>1.9.7version>
        dependency>

        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.5.6version>
        dependency>

        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>1.2.17version>
        dependency>

        <dependency>
            <groupId>com.github.pagehelpergroupId>
            <artifactId>pagehelperartifactId>
            <version>5.1.4version>
        dependency>

        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatis-springartifactId>
            <version>2.0.5version>
        dependency>

        <dependency>
            <groupId>com.github.jsqlparsergroupId>
            <artifactId>jsqlparserartifactId>
            <version>1.4version>
        dependency>
    dependencies>

环境准备

以下环境都可以自己自定义，教程举例User

• UserMapper
• UserService
• UserServiceImpl
• Test(单元测试Junit)

接下来是代码示例

代码示例

UserMapper

public interface UserMapper {

	//可以自定义相关简单查询
    @Select("select * from r_user u,r_order o where o.id = u.uid")
    @Results(id = "empMap",value = {
            @Result(column = "uid",property = "uid"),
            @Result(column = "name",property = "name"),
            @Result(column = "password",property = "password"),
            @Result(column = "total",property = "order.total"),
            @Result(property = "order",
            javaType = Order.class,column = "id",
            one = @One(select = "cn.marinda.mapper.OrderMapper.findById"))})
    List<User> findAllInfo();

UserService

public interface UserService {

    List<User> findAllInfo();

}

UserServiceImpl

@Service("userService")
public class UserServiceImpl implements UserService {

    @Resource
    private UserMapper userMapper;
    /**
     * 添加用户
     */
    public List<User> findAllInfo() {
        return userMapper.findAllInfo();
    }

}

MybatisTest

public class MybatisTest {
    public UserMapper userMapper;

    @Test
    public void tests(){
        System.out.println("userMapper:" + userMapper);
        List<User> userList = userMapper.findAllInfo();

        for(User user : userList){
            System.out.println("user: " + user);
        }

    }
}

结果

user: User{uid='69a1a643-f670-4ef1-b455-a751513b3bb7', name='张三', password='1', sex=男, age=16, portait='http://www.baidu.com', order=Order{id='69a1a643-f670-4ef1-b455-a751513b3bb7', oid='testxx', total=100.0, uid=null}, orderList=null, roleList=null, uidList=null}
user: User{uid='69yt', name='test', password='1', sex=男, age=16, portait='http://www.baidu.com', order=Order{id='69yt', oid='testsss', total=100.0, uid=null}, orderList=null, roleList=null, uidList=null}

错误注意事项

java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyResultSet.isClosed()

错误解析：

由于我的数据源c3p0 版本较低，所以需要更改以下c3p0版本到：0.9.5.2即可！

结束语

今天我们讲解了一下SSM学习笔记 ——Spring纯注解整合Mybatis教程

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