mybatis的curd

最新推荐文章于 2025-03-26 18:59:48 发布

高旭t-t

最新推荐文章于 2025-03-26 18:59:48 发布

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mabatis_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>
<properties resource="curd.properties"></properties>
<typeAliases>
<typeAlias alias="Category" type="mybatis.curd.model.Category" />
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mybatis/curd/dao/sql/category.xml" />
</mappers>
</configuration>

curd.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/db_mybatis_test?Unicode=true&characterEncoding=UTF-8
username=root
password=

简单的mybatis工具类封装，获取sqlSessionFactory
MybatisUtil.java

package mybatis.curd.util;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MybatisUtil {
private static SqlSessionFactory sqlSessionFactory = null;
static {
try {
String resource = "mybatis_config.xml";
InputStream is = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSqlSessionFactory() {
return sqlSessionFactory;
}
}

定义实体bean
Category.java

package mybatis.curd.model;
/**
* POJO
*
* @author guxingke
* */
public class Category {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Category [id=" + id + ", name=" + name + "]";
}
}

数据库操作接口
CategoryDao.java

package mybatis.curd.dao;
import java.util.List;
import mybatis.curd.model.Category;
/**
* 定义接口，与具体持久化操作无关
*
* @author guxingke
* */
public interface CategoryDao {
public Category getCategory(Integer id);
public void saveCategory(Category category);
public void updateCategory(Category category);
public void deleteCategory(Integer id);
public List<Category> selectAll();
public List<Category> fuzzyQuery(String name);
}

mybatis的持久化操作mapper映射文件
category.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="mybatis.curd.dao.CategoryDao">

<insert id="saveCategory" parameterType="Category">
insert into
t_category(name) values(#{name})
</insert>

<select id="getCategory" parameterType="int" resultType="Category">
select *
from t_category where id = #{id}
</select>

<update id="updateCategory" parameterType="Category">
update t_category set
name = #{name} where id = #{id}
</update>

<select id="selectAll" resultType="Category">
select * from t_category
</select>

<select id="fuzzyQuery" resultType="Category" parameterType="java.lang.String">
select *
from t_category where name like "%"#{name}"%"
</select>

<delete id="deleteCategory" parameterType="int">
delete from t_category
where
id = #{id}
</delete>
</mapper>

测试mybatis3推荐的持久化操作方式
CategoryDaoTest2.java

测试mybatis3之前的持久化操作方式
CategoryDaoTest.java

package mybatis.curd.dao;
import java.util.List;
import mybatis.curd.model.Category;
import mybatis.curd.util.MybatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* 测试mybatis3之前的操作方式
*
* @author guxingke
* */
public class CategoryDaoTest {
@Test
public void testGetCategory() {
category = session.selectOne(
"mybatis.curd.dao.CategoryDao.getCategory", 1);
System.out.println(category);
}
@Test
public void testSaveCategory() {
category.setName("curd");
session.insert("mybatis.curd.dao.CategoryDao.saveCategory", category);
}
@Test
public void testUpdateCategory() {
category.setName("update di =3");
category.setId(3);
session.update("mybatis.curd.dao.CategoryDao.updateCategory", category);
}
@Test
public void testDeleteCategory() {
session.delete("mybatis.curd.dao.CategoryDao.deleteCategory", 2);
}
@Test
public void testSelectAll() {
List<Category> categories = session
.selectList("mybatis.curd.dao.CategoryDao.selectAll");
for (Category category : categories) {
System.out.println(category);
}
}
@Test
public void testFuzzyQuery() {
List<Category> categories = session.selectList(
"mybatis.curd.dao.CategoryDao.fuzzyQuery", "y");
for (Category category : categories) {
System.out.println(category);
}
}
@Before
public void setUp() {
session = MybatisUtil.getSqlSessionFactory().openSession();
category = new Category();
}
@After
public void tearDown() {
session.commit();
session.close();
}
SqlSession session = null;
Category category = null;
}

--------------------- 本文来自孤星可的优快云博客，全文地址请点击：https://blog.youkuaiyun.com/u011882512/article/details/43907581?utm_source=copy

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