spring boot項目之mybatis注解方式的使用

一、第一步想引入mybatis包

 

 二、寫mapper文件

   注：

@Results({
            @Result(column = "category_id", property = "categoryId"),
            @Result(column = "category_name", property = "categoryName"),
            @Result(column = "category_type", property = "categoryType")
    })
中@Results注解是設置希望返回的值，沒有設置的不會返回。
傳多參數時，要用到@Param（"*"）

 

 

package com.imooc.dataobject.mapper;

import com.imooc.dataobject.ProductCategory;
import org.apache.ibatis.annotations.*;

import java.util.List;
import java.util.Map;

public interface ProductCategoryMapper {

    @Insert("insert into product_category(category_name, category_type) values (#{categoryName, jdbcType=VARCHAR}, #{category_type, jdbcType=INTEGER})")
    int insertByMap(Map<String, Object> map);

    @Insert("insert into product_category(category_name, category_type) values (#{categoryName, jdbcType=VARCHAR}, #{categoryType, jdbcType=INTEGER})")
    int insertByObject(ProductCategory productCategory);

    @Select("select * from product_category where category_type = #{categoryType}")
    @Results({
            @Result(column = "category_id", property = "categoryId"),
            @Result(column = "category_name", property = "categoryName"),
            @Result(column = "category_type", property = "categoryType")
    })
    ProductCategory findByCategoryType(Integer categoryType);

    @Select("select * from product_category where category_name = #{categoryName}")
    @Results({
            @Result(column = "category_id", property = "categoryId"),
            @Result(column = "category_name", property = "categoryName"),
            @Result(column = "category_type", property = "categoryType")
    })
    List<ProductCategory> findByCategoryName(String categoryName);

    @Update("update product_category set category_name = #{categoryName} where category_type = #{categoryType}")
    int updateByCategoryType(@Param("categoryName") String categoryName, @Param("categoryType") Integer categoryType);

    @Update("update product_category set category_name = #{categoryName} where category_type = #{categoryType}")
    int updateByObject(ProductCategory productCategory);

    @Delete("delete from product_category where category_type = #{categoryType}")
    int deleteByCategoryType(Integer categoryType);

    ProductCategory selectByCategoryType(Integer categoryType);
}

在測試類中檢驗

 

package com.imooc.mapper;

import com.imooc.dataobject.ProductCategory;
import com.imooc.dataobject.mapper.ProductCategoryMapper;
import lombok.extern.slf4j.Slf4j;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j
public class ProductCategoryMapperTest {

    @Autowired
    private ProductCategoryMapper mapper;

    @Test
    public void insertByMap() throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("categoryName", "師兄最不愛");
        map.put("category_type", 101);
        int result = mapper.insertByMap(map);
        Assert.assertEquals(1, result);
    }

    @Test
    public void insertByObject() {
        ProductCategory productCategory = new ProductCategory();
        productCategory.setCategoryName("師兄最不愛");
        productCategory.setCategoryType(102);
        int result = mapper.insertByObject(productCategory);
        Assert.assertEquals(1, result);
    }

    @Test
    public void findByCategoryType() {
        ProductCategory result = mapper.findByCategoryType(102);
        Assert.assertNotNull(result);
    }

    @Test
    public void findByCategoryName() {
        List<ProductCategory> result = mapper.findByCategoryName("師兄最不愛");
        Assert.assertNotEquals(0, result.size());
    }

    @Test
    public void updateByCategoryType() {
        int result = mapper.updateByCategoryType("師兄最不愛的分類", 102);
        Assert.assertEquals(1, result);
    }

    @Test
    public void updateByObject() {
        ProductCategory productCategory = new ProductCategory();
        productCategory.setCategoryName("師兄最不愛");
        productCategory.setCategoryType(102);
        int result = mapper.updateByObject(productCategory);
        Assert.assertEquals(1, result);
    }

    @Test
    public void deleteByCategoryType() {
        int result = mapper.deleteByCategoryType(102);
        Assert.assertEquals(1, result);
    }

    @Test
    public void selectByCategoryType() {
        ProductCategory productCategory = mapper.selectByCategoryType(101);
        Assert.assertNotNull(productCategory);
    }

}

三、在啟動的主類SellApplication上配置mapper文件的掃描
　　路徑，即增加注解@MapperScan（basePackages=*[mapper文件夾的路徑]）

 

四、如果你要在控制台上查到mysql的語句，可以在application.yml上加入以下配置：