1.常用注解
2.使用流程
2.1 com.imooc.mybatis.dao包下创建接口
package com.imooc.mybatis.dao; import com.imooc.mybatis.dto.GoodsDTO; import com.imooc.mybatis.entity.Goods; import org.apache.ibatis.annotations.*; import java.util.List; public interface GoodsDAO { @Select("select * from t_goods where current_price between #{min} and #{max} order by current_price limit 0,#{limt}") public List<Goods> selectByPriceRange(@Param("min") Float min ,@Param("max") Float max ,@Param("limt") Integer limt); @Insert("INSERT INTO t_goods(title, sub_title, original_cost, current_price, discount, is_free_delivery, category_id) VALUES (#{title} , #{subTitle} , #{originalCost}, #{currentPrice}, #{discount}, #{isFreeDelivery}, #{categoryId})") //<selectKey> @SelectKey(statement = "select last_insert_id()" , before = false , keyProperty = "goodsId" , resultType = Integer.class) public int insert(Goods goods); @Select("select * from t_goods") //<resultMap> @Results({ //<id> @Result(column = "goods_id" ,property = "goodsId" , id = true) , //<result> @Result(column = "title" ,property = "title"), @Result(column = "current_price" ,property = "currentPrice") }) public List<GoodsDTO> selectAll(); }
2.2 mybatis-config.xml
<?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> <settings> <!-- goods_id ==> goodsId 驼峰命名转换 --> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <!--设置默认指向的数据库--> <environments default="dev"> <!--配置环境,不同的环境不同的id名字--> <environment id="dev"> <!-- 采用JDBC方式对数据库事务进行commit/rollback --> <transactionManager type="JDBC"></transactionManager> <!--采用连接池方式管理数据库连接--> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/babytun?useUnicode=true&characterEncoding=UTF-8"/> <property name="username" value="root"/> <property name="password" value="root"/> </dataSource> </environment> </environments> <mappers> <!--<mapper class="com.imooc.mybatis.dao.GoodsDAO"/>--> <package name="com.imooc.mybatis.dao"/> </mappers> </configuration>
2.3 测试用例
package com.imooc.mybatis; import com.imooc.mybatis.dao.GoodsDAO; import com.imooc.mybatis.dto.GoodsDTO; import com.imooc.mybatis.entity.Goods; import com.imooc.mybatis.utils.MyBatisUtils; import org.apache.ibatis.session.SqlSession; import org.junit.Test; import java.util.List; //JUNIT单元测试类 public class MyBatisTestor { @Test public void testSelectByPriceRange() throws Exception { SqlSession session = null; try{ session = MyBatisUtils.openSession(); GoodsDAO goodsDAO = session.getMapper(GoodsDAO.class); List<Goods> list = goodsDAO.selectByPriceRange(100f, 500f, 20); System.out.println(list.size()); }catch (Exception e){ throw e; } finally { MyBatisUtils.closeSession(session); } } /** * 新增数据 * @throws Exception */ @Test public void testInsert() throws Exception { SqlSession session = null; try{ session = MyBatisUtils.openSession(); Goods goods = new Goods(); goods.setTitle("测试商品"); goods.setSubTitle("测试子标题"); goods.setOriginalCost(200f); goods.setCurrentPrice(100f); goods.setDiscount(0.5f); goods.setIsFreeDelivery(1); goods.setCategoryId(43); GoodsDAO goodsDAO = session.getMapper(GoodsDAO.class); //insert()方法返回值代表本次成功插入的记录总数 int num = goodsDAO.insert(goods); session.commit();//提交事务数据 System.out.println(goods.getGoodsId()); }catch (Exception e){ if(session != null){ session.rollback();//回滚事务 } throw e; }finally { MyBatisUtils.closeSession(session); } } @Test public void testSelectAll() throws Exception { SqlSession session = null; try{ session = MyBatisUtils.openSession(); GoodsDAO goodsDAO = session.getMapper(GoodsDAO.class); List<GoodsDTO> list = goodsDAO.selectAll(); System.out.println(list.size()); }catch (Exception e){ throw e; } finally { MyBatisUtils.closeSession(session); } } }
原文地址:http://www.cnblogs.com/LLL0617/p/16908397.html
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