Mybatis基础：增删改查、模糊查询、多条件查询

Mybatis基础增删改查、模糊查询、多条件查询

1、新建测试数据库，根据实体类属性创建

2、实体类

package com.entity;

/**
 * 数据库实体类
 * Created by lvjun on 2018-04-12.
 */
public class Category {
    private int id;
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    //显示中文
    @Override
    public String toString() {
        return "Category{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

3、配置文件Category.xml

    
    
        select * from   category
    
    
    
        delete from category where id= #{id}
    
    
    
        select * from   category  where id= #{id}
    
    
    
        update category set name=#{name} where id=#{id}
    
    
    
        insert into category ( name ) values (#{name})
    
    
    
        select * from   category  where name like concat('%',#{0},'%')
    
    
    
        select * from category
        
            
                and id > #{id}
            
            
                and name like concat('%',#{name},'%')
            
        
    

4、配置文件mybatis-config.xml

5、测试类

package com.lvjun;


import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;


/**
 * 查询列表
 * Created by lvjun on 2018-04-12.
 */
public class TestSelectList {

    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        List cs = session.selectList("listCategory");
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
         }

    }
}

package com.lvjun;

import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * 查询一条记录
 * Created by lvjun on 2018-04-12.
 */
public class TestSelectOne {

    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        Category c = session.selectOne("getCategory", 3);
        System.out.println(c.getId()+"  "+c.getName());
        session.commit();
        session.close();

    }

}

package com.lvjun;

import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * 模糊查询
 * Created by lvjun on 2018-04-12.
 */
public class TestSelectLike {

    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        List cs = session.selectList("listCategoryByName", "win");
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
        }

        session.commit();
        session.close();

    }

}

package com.lvjun;

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

import com.entity.Category;

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

/**
 * 多条件查询
 * Created by lvjun on 2018-04-12.
 */
public class TestSelectToLike {
    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        Map params = new HashMap<>();
        params.put("id", 3); //条件查询
        params.put("name", "wi");

        List cs = session.selectList("listCategoryByIdAndName", params);
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
        }

        session.commit();
        session.close();

    }
}

package com.lvjun;

import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;


/**
 * 修改记录
 * Created by lvjun on 2018-04-12.
 */
public class TestUpdate {
    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        Category c = session.selectOne("getCategory", 2);
        c.setName("Android 8");
        session.update("updateCategory", c);

        listAll(session);

        session.commit();
        session.close();

    }

    private static void listAll(SqlSession session) {
        List cs = session.selectList("listCategory");
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
        }
    }
}

package com.lvjun;

import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * 插入一条记录
 * Created by lvjun on 2018-04-12.
 */
public class TestInsert {
    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        Category c = new Category();
        c.setName("新增加的数据");
        session.insert("addCategory", c);

        listAll(session);

        session.commit();
        session.close();

    }

    private static void listAll(SqlSession session) {
        List cs = session.selectList("listCategory");
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
        }
    }
}

package com.lvjun;

import com.entity.Category;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * 删除一条记录
 * Created by lvjun on 2018-04-12.
 */
public class TestDeleteOne {
    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();

        Category c = new Category();
        c.setId(6);
        session.delete("deleteCategory", c);

        listAll(session);

        session.commit();
        session.close();

    }

    private static void listAll(SqlSession session) {
        List cs = session.selectList("listCategory");
        for (Category c : cs) {
            System.out.println(c.getId()+"  "+c.getName());
        }
    }

}