MyBatis单列工厂的实现

MyBatis单列工厂的实现

SqlSessionFactoryUtils

1package com.utils;
2
3import org.apache.ibatis.io.Resources;
4import org.apache.ibatis.session.SqlSession;
5import org.apache.ibatis.session.SqlSessionFactory;
6import org.apache.ibatis.session.SqlSessionFactoryBuilder;
7
8import java.io.IOException;
9import java.io.InputStream;
10
11/**
12 * @author: XDZY
13 * @date: 2018/8/8 14:50
14 * @description: SessionFactory工厂
15 */
16public class SqlSessionFactoryUtils {
17    private final static Class<SqlSessionFactoryUtils> LOCK = SqlSessionFactoryUtils.class;
18
19    private static SqlSessionFactory sqlSessionFactory = null;
20
21    private SqlSessionFactoryUtils() {
22    }
23
24    public static SqlSessionFactory getSqlSessionFactory() {
25        synchronized (LOCK) {
26            if (sqlSessionFactory != null) {
27                return sqlSessionFactory;
28            }
29            String resource = "com/mybatis-config.xml";
30            InputStream inputStream;
31            try {
32                inputStream = Resources.getResourceAsStream(resource);
33                sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
34            } catch (IOException e) {
35                e.printStackTrace();
36                return null;
37            }
38            return sqlSessionFactory;
39        }
40    }
41
42    public static SqlSession openSqlSession() {
43        if (sqlSessionFactory == null) {
44            getSqlSessionFactory();
45        }
46        return sqlSessionFactory.openSession();
47    }
48}

Test

1package com.main;
2
3import com.mapper.RoleMapper;
4import com.pojo.Role;
5import com.utils.SqlSessionFactoryUtils;
6import org.apache.ibatis.session.SqlSession;
7
8/**
9 * @author: XDZY
10 * @date: 2018/8/8 15:12
11 * @description: 运行入口
12 */
13public class TestMain {
14    public static void main(String[] args) {
15        SqlSession sqlSession = null;
16        try {
17            sqlSession = SqlSessionFactoryUtils.openSqlSession();
18            RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
19            Role role = roleMapper.getRole(1L);
20            System.out.println(role.getRoleName());
21        } finally {
22            if (sqlSession != null) {
23                sqlSession.close();
24            }
25        }
26    }
27}