SSM学习

JDBC 测试工程
新建javaProject, 导入：数据库驱动包 mysql-connector-java-5.1.46-bin.jar

package com.zcl.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JdbcTest {
		
	public static void main(String[] args) {

		//链接对象
		Connection con = null;
		
		//查询对象
		PreparedStatement ps = null;
		
		//结果集对象
		ResultSet rs = null;
		
		try {
			//加载数据库驱动
			Class.forName("com.mysql.jdbc.Driver");
			
			//获取连接
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ssm_mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=false", "root", "123");
			
			String sql = "SELECt * FROM user WHERe u_sex = ?";
			//获取statement
			ps = con.prepareStatement(sql );
			ps.setString(1, "0");
			
			//查询 输出结果
			rs = ps.executeQuery();
			while(rs.next()) {
				System.out.println(rs.getString("u_id") + "   " + rs.getString("u_username") +"   " + rs.getString("u_sex"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if(rs != null) {
				try {
					rs.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
			
			if(ps != null) {
				try {
					ps.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
			
			if(con != null) {
				try {
					con.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
		
		
		
	}
}

Mybatis测试工程：
新建javaProject， 导入：
数据库驱动包: mysql-connector-java-5.1.46-bin.jar ojdbc7.jar
mybatis包: mybatis-3.4.6.jar
依赖包:

创建javaBean对象

User

package com.sikiedu.bean;

import java.util.Date;

public class User {

	
	
	private Integer u_id;
	private String u_username;
	private String u_password;
	private String u_sex;
	private Date u_createTime;
	private Integer u_cid;
	
	public Integer getU_id() {
		return u_id;
	}
	public void setU_id(Integer u_id) {
		this.u_id = u_id;
	}
	public String getU_username() {
		return u_username;
	}
	public void setU_username(String u_username) {
		this.u_username = u_username;
	}
	public String getU_password() {
		return u_password;
	}
	public void setU_password(String u_password) {
		this.u_password = u_password;
	}
	public String getU_sex() {
		return u_sex;
	}
	public void setU_sex(String u_sex) {
		this.u_sex = u_sex;
	}
	public Date getU_createTime() {
		return u_createTime;
	}
	public void setU_createTime(Date u_createTime) {
		this.u_createTime = u_createTime;
	}
	public Integer getU_cid() {
		return u_cid;
	}
	public void setU_cid(Integer u_cid) {
		this.u_cid = u_cid;
	}
	@Override
	public String toString() {
		return "User [u_id=" + u_id + ", u_username=" + u_username + ", u_password=" + u_password + ", u_sex=" + u_sex
				+ ", u_createTime=" + u_createTime + ", u_cid=" + u_cid + "]";
	}
}

创建主配置文件

sqlMapCOnfig.xml

创建UserMapper配置文件

	
	
		 select * from user where u_id = #{id}
	
	
	
	
	
	
	
		
		SELECt * FROM USER WHERe u_username LIKE "%"#{name}"%"
	
	
	
	
		insert into user values( null, #{u_username} , #{u_password}, #{u_sex}, #{u_createTime}, #{u_cid} )
	
	
	
	
		update user set u_username = #{u_username} where u_id = #{u_id}
	
	
	
	
		delete from user Where u_id = #{id}
	
	

 
使用
 HelloMyBatis .java
 
package com.sikiedu.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.sikiedu.bean.User;

public class HelloMyBatis {

	@Test
	//入门程序 通过ID 查询用户
	public void Test1() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//需要sqlSessionFactoryBulider
		SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = ssfb.build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
		User user = session.selectOne("UserMapper.selectUserById", 1);
		System.out.println(user);
	}
	
	@Test
	//入门程序 通过ID 查询用户
	public void Test2() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//需要sqlSessionFactoryBulider
		SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = ssfb.build(in);
		
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
		List list = session.selectList("UserMapper.selectUserByName", "王");
		
		for (User u : list) {
			System.out.println(u);
		}
	}
	
	@Test
	//入门程序 通过ID 查询用户
	public void Test3() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//需要sqlSessionFactoryBulider
		SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = ssfb.build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
		User user = new User();
		user.setU_username("小明1");
		user.setU_password("123123");
		user.setU_sex("1");
		user.setU_createTime(new Date());
		user.setU_cid(1);
		
		session.insert("UserMapper.insertUser", user);
		session.commit();
	}
	
	@Test
	//入门程序 通过ID 查询用户
	public void Test4() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//需要sqlSessionFactoryBulider
		SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = ssfb.build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
		User user = new User();
		user.setU_id(13);
		user.setU_username("小刚");
		
		session.update("UserMapper.updateUser", user);
		session.commit();
	}
	
	@Test
	//入门程序 通过ID 查询用户
	public void Test5() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//需要sqlSessionFactoryBulider
		SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = ssfb.build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
	
		session.delete("UserMapper.deleteUserById", 13);
		session.commit();
	}
	
}

 
DAO层开发
 其实就是对上面的使用进一步封装
 
package com.sikiedu.dao;

import com.sikiedu.bean.User;

public interface UserDao {
	
	//根据id查询用户
	public User getUserById(Integer id);

}
 
package com.sikiedu.dao;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import com.sikiedu.bean.User;

public class UserDaoImpl implements UserDao {

	//sqlSession工厂
	private SqlSessionFactory ssf;
	
	//通过构造器给ssf 赋值
	public UserDaoImpl(SqlSessionFactory ssf) {
		this.ssf = ssf;
	}

	@Override
	public User getUserById(Integer id) {
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		//操作数据库
		//参数1：要操作的sql语句   参数2 sql语句的参数
		return session.selectOne("UserMapper.selectUserById", id);
	}

}
 
DAO测试
 
package com.sikiedu.test;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.sikiedu.bean.User;
import com.sikiedu.dao.UserDao;
import com.sikiedu.dao.UserDaoImpl;

public class UserDaoTest {
	
	//sqlSession工厂
	private static SqlSessionFactory ssf;
	
	static {
		String resource = "sqlMapConfig.xml";
		InputStream in;
		try {
			in = Resources.getResourceAsStream(resource );
			SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
			 ssf = ssfb.build(in);
			 in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void DaoTest() {
		UserDao dao = new UserDaoImpl(ssf);
		User user = dao.getUserById(1);
		System.out.println(user);
	}
	
}

 
动态代理开发
 //mapper动态代理开发四大原则 + 一个注意
 //1、接口方法名需要与mapper.xml的要调用的sql语句的id一致
 //2、接口的形参类型需要与mapper.xml parameterType 一致
 //3、接口的返回值需要与mapper.xml resultType一致
 //4、mapper.xml 中namespace要与接口的全包名一致
 //5、注意mapper动态代理开发中，根据返回值类型来自动选择
 
package com.sikiedu.mapper;

import java.util.List;

import com.sikiedu.bean.User;
import com.sikiedu.bean.UserVo;

public interface UserMapper {

	//mapper动态代理开发四大原则 + 一个注意
	//1、接口方法名需要与mapper.xml的要调用的sql语句的id一致
	//2、接口的形参类型需要与mapper.xml parameterType 一致
	//3、接口的返回值需要与mapper.xml resultType一致
	//4、mapper.xml 中namespace要与接口的全包名一致
	//5、注意mapper动态代理开发中，根据返回值类型来自动选择
	
	//通过id查询一个用户
	public User selectUserById(Integer id);
	
	//通过用户名模糊查询 获取用户列表
	public List selectUserByName(String name);
	
	//通过UserVo id查询一个用户
	public User selectUserByUserVoId(UserVo vo);
	
	//查询用户总条数
	public Integer selectUserCount();
	
	//查询所有用户包装类
	public List selectAllUserVo();
	
	//多条件查询 通过用户对象中的条件查询用户列表
	public List selectUserListByUser(User u);

	//多条件查询 通过用户对象中的条件查询用户列表Trim
	public List selectUserListByUserTrim(User u);

	//更新用户表
	public void updateSetUser(User u);
	
	//使用多个id获取用户列表 by array
	public List selectUserListByIds(Integer[] ids);
	
	//使用多个id获取用户列表 by list
	public List selectUserListByList(List idList);
	
	//使用多个id获取用户列表 by userVO
	public List selectUserListByUserVo(UserVo vo);
}

 
Mapper动态代理开发测试
 
package com.sikiedu.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.sikiedu.bean.Country;
import com.sikiedu.bean.CountryVo;
import com.sikiedu.bean.User;
import com.sikiedu.bean.UserVo;
import com.sikiedu.mapper.CountryMapper;
import com.sikiedu.mapper.UserMapper;

public class MapperTest {
	
	@Test
	public void Test1() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		User user = mapper.selectUserById(1);
		System.out.println(user);
		
	}
	
	@Test
	public void Test2() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		List list = mapper.selectUserByName("王");
		for (User u : list) {
			System.out.println(u);
		}
	}
	
	@Test
	public void Test_selectUserByUserVoId() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		UserVo vo = new UserVo();
		User u = new User();
		u.setU_id(5);
		//vo.setUser(u);
		
		User user = mapper.selectUserByUserVoId(vo );
		System.out.println(user);
	}
	
	@Test
	public void Test_selectUserCount() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		Integer count = mapper.selectUserCount();
		System.out.println(count);
	}
	
	@Test
	public void Test_selectAll() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		CountryMapper mapper = session.getMapper(CountryMapper.class);
		
		List list = mapper.selectAll();
		
		for (Country country : list) {
			System.out.println(country);
		}
	}
	
	@Test
	public void Test_selectAllUserVo() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		List list = mapper.selectAllUserVo();
		
		for (UserVo userVo : list) {
			System.out.println(userVo);
		}
	}
	
	@Test
	public void Test_selectAllCountryVo() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
			
		CountryMapper mapper = session.getMapper(CountryMapper.class);
		List list = mapper.selectAllCountryVo();
		
		for (CountryVo countryVo : list) {
			System.out.println(countryVo);
		}
	}
	
	@Test
	public void Test_selectUserListByUser() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
			
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		User u = new User();
		u.setU_sex("1");
		u.setU_username("王");
		//u.setU_cid(1);
		
		List list = mapper.selectUserListByUser(u);
		
		for (User user : list) {
			System.out.println(user);
		}
	}
	
	@Test
	public void Test_selectUserListByUserTrim() throws IOException {
		String resource = "sqlMapConfig.xml";
		//读取配置文件
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionfactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		 
		//生产一个sqlSession
		SqlSession session = ssf.openSession();
			
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		User u = new User();
		u.setU_sex("1");
		u.setU_username("王");
		//u.setU_cid(1);
		
		List list = mapper.selectUserListByUserTrim(u);
		
		for (User user : list) {
			System.out.println(user);
		}
	}
	
	@Test
	public void Test_updateSetUser() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		User u = new User();
		u.setU_id(1);
		u.setU_username("隔壁老王");
		u.setU_password("aaa");
		//u.setU_sex("1");
		
		mapper.updateSetUser(u);
		session.commit();
	}
	
	
	@Test
	public void Test_selectUserListByIds() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		Integer[] ids = {1, 3, 5, 12};
		List list = mapper.selectUserListByIds(ids);
		
		for (User user : list) {
			System.out.println(user);
		}
		
	}
	
	@Test
	public void Test_selectUserListByList() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		List idList = new ArrayList();
		idList.add(1);
		idList.add(4);
		idList.add(8);
		
		List list = mapper.selectUserListByList(idList );
		
		for (User user : list) {
			System.out.println(user);
		}
	}
	
	@Test
	public void Test_selectUserListByUserVo() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		List idList = new ArrayList();
		idList.add(1);
		idList.add(4);
		idList.add(8);
		
		UserVo vo = new UserVo();
		vo.setIdList(idList);
		
		List list = mapper.selectUserListByUserVo(vo );
		
		for (User user : list) {
			System.out.println(user);
		}
	}
}

 
MGB
 根据数据库表生成 bean对象， java 接口， sqlMapper 配置文件， 是不是很强大啊
 
 
 
创建新的Java工程
 复制配置文件， 导入依赖包， 运行就可以生成我们需要的文件了 。
 
 Generator.java
 
package com.sikiedu.test;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

public class Generator {
	public static void main(String[] args) throws Exception {
		  List warnings = new ArrayList();
		   boolean overwrite = true;
		   File configFile = new File("src/generatorConfig.xml");
		   ConfigurationParser cp = new ConfigurationParser(warnings);
		   Configuration config = cp.parseConfiguration(configFile);
		   DefaultShellCallback callback = new DefaultShellCallback(overwrite);
		   MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
		   myBatisGenerator.generate(null);
	}
}

 
如何写配置文件 ：
 generatorConfig.xml
 




	
  
  
  
  
  
  
  	
  
  	
  
  
  
  
    
    

	
    
      
    

	
    
    
      
      
      
    

	
    
      
    

	
    
      
    

	
	
使用生成的文件去操作数据库
package com.sikiedu.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.sikiedu.bean.User;
import com.sikiedu.bean.UserExample;
import com.sikiedu.mapper.UserMapper;

public class MapperTest {
	
	@Test
	public void Test1() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		//按住键查询
		User user = mapper.selectByPrimaryKey(1);
		System.out.println(user);
	}
	
	@Test
	public void Test2() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		
		UserExample example = new UserExample();
		//将条件封装到createCriteria集合中
		example.createCriteria().andUSexEqualTo("1").andUUsernameLike("%王%");
		
		//按条件查询
		List list = mapper.selectByExample(example);
		
		for (User user : list) {
			System.out.println(user);
		}
	
	}
	
	@Test
	public void Test3() throws IOException {
		String resource = "sqlMapConfig.xml";
		InputStream in = Resources.getResourceAsStream(resource );
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		SqlSession session = ssf.openSession();
		
		UserMapper mapper = session.getMapper(UserMapper.class);
		User user = new User() ;
		user.setuUsername("赵云");
		
		mapper.insertSelective(user);
		
		session.commit();
	}
	
	
}


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