Mybatis基礎：增刪改查、模糊查詢、多條件查詢http://www.bieryun.com/3132.html

1、新建測試數據庫，根據實體類屬性創建

2、實體類

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package?com.entity;

?

/**

?*?數據庫實體類

?*?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;

????}

?

????//顯示中文

????@Override

????public?String?toString()?{

????????return?"Category{"?+

????????????????"id="?+?id?+

????????????????",?name='"?+?name?+?'\''?+

????????????????'}';

????}

}

3、配置文件Category.xml

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<?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="com.entity">

????<!--列表-->

????<select?id="listCategory"?resultType="Category">

????????select?*?from???category

????</select>

????<!--刪除-->

????<delete?id="deleteCategory"?parameterType="Category">

????????delete?from?category?where?id=?#{id}

????</delete>

????<!--查詢單個-->

????<select?id="getCategory"?parameterType="_int"?resultType="Category">

????????select?*?from???category??where?id=?#{id}

????</select>

????<!--修改-->

????<update?id="updateCategory"?parameterType="Category">

????????update?category?set?name=#{name}?where?id=#{id}

????</update>

????<!--添加-->

????<insert?id="addCategory"?parameterType="Category">

????????insert?into?category?(?name?)?values?(#{name})

????</insert>

????<!--模糊查詢-->

????<select?id="listCategoryByName"?parameterType="string"?resultType="Category">

????????select?*?from???category??where?name?like?concat('%',#{0},'%')

????</select>

????<!--多條件查詢-->

????<select?id="listCategoryByIdAndName"?resultType="Category">

????????select?*?from?category

????????<where>

????????????<if?test="id!=null">

????????????????and?id?>?#{id}

????????????</if>

????????????<if?test="name!=null">

????????????????and?name?like?concat('%',#{name},'%')

????????????</if>

????????</where>

????</select>

?

</mapper>

4、配置文件mybatis-config.xml

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<?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>

????<typeAliases>

????????<package?name="com.entity"/>

????</typeAliases>

????<environments?default="development">

????????<environment?id="development">

????????????<transactionManager?type="JDBC"/>

????????????<dataSource?type="POOLED">

????????????????<property?name="driver"?value="com.mysql.jdbc.Driver"/>

????????????????<property?name="url"?value="jdbc:mysql://localhost:3306/school?characterEncoding=UTF-8"/>

????????????????<property?name="username"?value="root"/>

????????????????<property?name="password"?value="1234"/>

????????????</dataSource>

????????</environment>

????</environments>

????<mappers>

????????<mapper?resource="Category.xml"/>

????</mappers>

</configuration>

5、測試類

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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;

?

?

/**

?*?查詢列表

?*?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<Category>?cs?=?session.selectList("listCategory");

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

?????????}

?

????}

}

[java] view plain copy

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;

?

/**

?*?查詢一條記錄

?*?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();

?

????}

?

}

?

[java] view plain copy

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;

?

/**

?*?模糊查詢

?*?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<Category>?cs?=?session.selectList("listCategoryByName",?"win");

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

????????}

?

????????session.commit();

????????session.close();

?

????}

?

}

[java] view plain copy

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;

?

/**

?*?多條件查詢

?*?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<String,?Object>?params?=?new?HashMap<>();

????????params.put("id",?3);?//條件查詢

????????params.put("name",?"wi");

?

????????List<Category>?cs?=?session.selectList("listCategoryByIdAndName",?params);

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

????????}

?

????????session.commit();

????????session.close();

?

????}

}

[java] view plain copy

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;

?

?

/**

?*?修改記錄

?*?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<Category>?cs?=?session.selectList("listCategory");

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

????????}

????}

}

?

[java] view plain copy

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;

?

/**

?*?插入一條記錄

?*?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("新增加的數據");

????????session.insert("addCategory",?c);

?

????????listAll(session);

?

????????session.commit();

????????session.close();

?

????}

?

????private?static?void?listAll(SqlSession?session)?{

????????List<Category>?cs?=?session.selectList("listCategory");

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

????????}

????}

}

?

[java] view plain copy

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;

?

/**

?*?刪除一條記錄

?*?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<Category>?cs?=?session.selectList("listCategory");

????????for?(Category?c?:?cs)?{

????????????System.out.println(c.getId()+"??"+c.getName());

????????}

????}

?

}

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