标签：util 13 java -- org blog sql import public
Mybatis系列--13-动态sql之环境搭建及if语句
概述
本文是动态sql学习的基础环境的搭建, 也涉及if语句
实践
在数据库中创建表
CREATE TABLE `blog`(
`id` VARCHAR(50) NOT NULL COMMENT '博客id',
`title` VARCHAR(100) NOT NULL COMMENT '博客标题',
`author` VARCHAR(30) NOT NULL COMMENT '博客作者',
`create_time` DATETIME NOT NULL COMMENT '创建时间',
`views` INT(30) NOT NULL COMMENT '浏览量'
)ENGINE=INNODB DEFAULT CHARSET=utf8
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>Mybatis-Study</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>Mybatis-Study07-dynamicSql</artifactId>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.24</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
</project>
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>
<properties resource="db.properties"></properties>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true" />
</settings>
<typeAliases>
<package name="com.com.com.kuang.pojo" />
</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>
<package name="com.kuang.dao" />
</mappers>
</configuration>
Blog.java
package com.kuang.pojo;
import java.util.Date;
import lombok.Data;
/**
* 功能描述
*
* @since 2022-07-22
*/
@Data
public class Blog {
private String id;
private String title;
private String author;
private Date createTime;
private int views;
}
IdUtil.java
package com.kuang.util;
import java.util.UUID;
/**
* 功能描述
*
* @since 2022-07-22
*/
public class IdUtil {
public static String getId() {
return UUID.randomUUID().toString().replaceAll("-", "");
}
}
MyBatisUtil.java
package com.kuang.util;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/**
* 功能描述
*
* @since 2022-07-13
*/
public class MyBatisUtil {
private static SqlSessionFactory sqlSessionFactory;
static {
try {
String resource = "mybatis-config.xml";
InputStream inputStream = null;
inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlsession() {
return sqlSessionFactory.openSession(true);
}
}
BlogMapper.java
package com.kuang.dao;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import com.kuang.pojo.Blog;
/**
* 功能描述
*
* @since 2022-07-22
*/
public interface BlogMapper {
void addBlog(Blog blog);
List<Blog> getBlogs(@Param("title") String title, @Param("author") String author);
}
BlogMapper.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.dao.BlogMapper">
<insert id="addBlog" parameterType="com.kuang.pojo.Blog">
insert into blog (id, title, author, create_time, views)
values (#{id}, #{title}, #{author}, #{createTime}, #{views})
</insert>
<select id="getBlogs" resultType="blog">
select * from blog where 1=1
<if test="title != null">
and title = #{title}
</if>
<if test="author != null">
and author = #{author}
</if>
</select>
</mapper>
测试类MyTest.java
import java.util.Date;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import com.kuang.dao.BlogMapper;
import com.kuang.pojo.Blog;
import com.kuang.util.IdUtil;
import com.kuang.util.MyBatisUtil;
/**
* 功能描述
*
* @since 2022-07-22
*/
public class MyTest {
@Test
public void TestAdd() {
SqlSession sqlsession = MyBatisUtil.getSqlsession();
BlogMapper mapper = sqlsession.getMapper(BlogMapper.class);
Blog blog = new Blog();
blog.setId(IdUtil.getId());
blog.setTitle("Mybatis");
blog.setAuthor("狂神说");
blog.setCreateTime(new Date());
blog.setViews(9999);
mapper.addBlog(blog);
blog.setId(IdUtil.getId());
blog.setTitle("Java");
mapper.addBlog(blog);
blog.setId(IdUtil.getId());
blog.setTitle("Spring");
mapper.addBlog(blog);
blog.setId(IdUtil.getId());
blog.setTitle("微服务");
mapper.addBlog(blog);
sqlsession.close();
}
@Test
public void TestGetBlogs() {
SqlSession sqlsession = MyBatisUtil.getSqlsession();
BlogMapper mapper = sqlsession.getMapper(BlogMapper.class);
List<Blog> blogs = mapper.getBlogs(null, "狂神说");
for (Blog blog : blogs) {
System.out.println(blog);
}
sqlsession.close();
}
}
标签：util,13,java,--,org,blog,sql,import,public 来源： https://www.cnblogs.com/Oh-mydream/p/16513958.html
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