mybatis学习(42):mybatis的一级缓存
2024-04-03 21:03:39
目录结构
com.geyao.mybatis.mapper
BlogMapper类
package com.geyao.mybatis.mapper;import java.util.List;
import java.util.Map;import org.apache.ibatis.annotations.Param;import com.geyao.mybatis.pojo.Blog;public interface BlogMapper {Blog selectBlog(Integer id);Blog selectBlog2(Integer id);List<Blog> selectBlogByTitle(String title);List<Blog> selectBlogByTitle2(String title);List<Blog> selectBlogBySort(String column);List<Blog> selectBlogByPage(int offset,int pagesize);List<Blog> selectBlogByPage1(@Param(value="offset")int offset,@Param(value="pagesize")int pagesize);List<Blog> selectBlogByPage2(Map<String, Object>map);int insertBlog(Blog blog);int insertBlogMysql(Blog blog);int updateBlog(Blog blog);int deleteBlogById(Integer id);List<Blog> selectActiveBlogByTitle(String title);List<Blog> selectActiveBlogByTitleOrStyle(Blog blog);List<Blog> selectBlogByCondition(Blog blog);int updateBlogByCondition(Blog blog);List<Blog> selectBlogByConditionTrim(Blog blog);int updateBlogByConditionTrim(Blog blog);int deleteBlogList(List<Integer> ids);
}
BlogMapper.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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)-->
<mapper namespace="com.geyao.mybatis.mapper.BlogMapper"><!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回User类就是users表所对应的实体类--><!-- 根据id查询得到一个user对象--><resultMap type="Blog" id="blogResultMap"><id column="id" property="id" jdbcType="INTEGER"></id><result column="authod_id" property="authodId" jdbcType="INTEGER"/></resultMap><!-- sql片段 --><sql id="columnbase">select id,title,authod_id as authodId,state,featured,style</sql><!-- crud --><select id="selectBlog" parameterType="int" resultType="Blog">select *from Blog where id=#{id}</select> <select id="selectBlog2" parameterType="int" resultMap="blogResultMap">select *from Blog where id=#{id}</select><select id="selectBlogByTitle" parameterType="String" resultMap="blogResultMap">select * from Blog where title like #{title}</select><select id="selectBlogByTitle2" parameterType="String" resultMap="blogResultMap">select * from Blog where title like '${value}'</select><select id="selectBlogBySort" parameterType="String" resultMap="blogResultMap">select * from Blog order by ${value}</select><select id="selectBlogByPage" resultMap="blogResultMap">select * from Blog limit #{0},#{1}</select><select id="selectBlogByPage1" resultMap="blogResultMap">select * from Blog limit #{offset},#{pagesize}</select><select id="selectBlogByPage2" resultMap="blogResultMap">select * from Blog limit #{offset},#{pagesize}</select><insert id="insertBlog" parameterType="Blog" useGeneratedKeys="true" keyProperty="id">INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><insert id="insertBlogOracle" parameterType="Blog" ><selectKey resultType="java.lang.Integer" order="BEFORE" keyProperty="id">select seq.nextval as id from dual</selectKey>INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><insert id="insertBlogMysql" parameterType="Blog" ><selectKey resultType="java.lang.Integer" order="AFTER" keyProperty="id">SELECT LAST_INSERT_ID()</selectKey>INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><update id="updateBlog" parameterType="Blog" >UPDATE BlogSETtitle = #{title},authod_id = #{authodId},state = #{state},featured = #{featured},
style= #{ style}WHERE id = #{id}</update><delete id="deleteBlogById" parameterType="int">delete from blog where id =#{id}</delete><!-- 动态sql --><select id="selectActiveBlogByTitle" parameterType="String" resultMap="blogResultMap">SELECT * FROM blogwhere state ='ACTIVE'<if test="value!=null and value !=''">AND title LIKE '%o%'</if></select><select id="selectActiveBlogByTitleOrStyle" parameterType="Blog" resultMap="blogResultMap">SELECT * FROM blogwhere state ='ACTIVE'<choose><when test="title !=null and title !=''">and lower(title) like lower(#{title})</when><when test="style !=null and style!=''"></when><otherwise>and featured=true;</otherwise></choose></select><select id="selectBlogByCondition" parameterType="Blog" resultMap="blogResultMap">select * from blog<where><if test="state !=null and state !=''">state=#{state}</if><if test="title !=null and title !=''">and lower(title) like lower(#{title})</if><if test=" featured !=null">and featured = #{featured}</if></where></select><update id="updateBlogByCondition" parameterType="Blog" >UPDATE Blog<set><if test="title!=null">title = #{title},</if><if test="authodId!=null">authod_id = #{authodId},</if><if test="state!=null">state = #{state},</if><if test="featured!=null">featured = #{featured},</if>
<if test="style!=null">style= #{ style}</if>
</set>WHERE id = #{id}</update><select id="selectBlogByConditionTrim" parameterType="Blog" resultMap="blogResultMap">select * from blog<trim prefix="where" prefixOverrides="and / or"><if test="state !=null and state !=''">state=#{state}</if><if test="title !=null and title !=''">lower(title) like lower(#{title})</if><if test=" featured !=null">and featured = #{featured}</if></trim></select><update id="updateBlogByConditionTrim" parameterType="Blog" >UPDATE Blog<trim prefix="set" suffixOverrides=","><if test="title!=null">title = #{title},</if><if test="authodId!=null">authod_id = #{authodId},</if><if test="state!=null">state = #{state},</if><if test="featured!=null">featured = #{featured},</if>
<if test="style!=null">style= #{ style}</if>
</trim>WHERE id = #{id}</update><delete id="deleteBlogList" parameterType="list" >delete from Blog where id in<foreach collection="list" item="item" open="(" close= ")" separator=",">#{item}</foreach></delete></mapper>
com.geyao.mybatis.pojo
Blog类
package com.geyao.mybatis.pojo;public class Blog {private Integer id;private String title;private int authodId;private String state;private Boolean featured;private String style;public Blog() {super();this.title="未命名";this.authodId=4;this.state="NOT";this.featured=false;this.style="red"; }public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public int getAuthodId() {return authodId;}public void setAuthodId(int authodId) {this.authodId = authodId;}public String getState() {return state;}public void setState(String state) {this.state = state;}public Boolean getFeatured() {return featured;}public void setFeatured(Boolean featured) {this.featured = featured;}public String getStyle() {return style;}public void setStyle(String style) {this.style = style;}@Overridepublic String toString() {return "Blog [id=" + id + ", title=" + title + ", authodId=" + authodId + ", state=" + state + ", featured="+ featured + ", style=" + style + "]\n";}}
com.geyao.mybatis.util
MybatisUtil类
package com.geyao.mybatis.util;import java.io.InputStream;
import java.io.Reader;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class MyBatisUtil {private static SqlSessionFactory sqlSessionFactory =null;static {try {InputStream in = Resources.getResourceAsStream("mybatis-config.xml");sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}private MyBatisUtil() {}public static SqlSession getSqlSession() {return sqlSessionFactory.openSession();}
}
log4j.properties
### \u914D\u7F6E\u6839 ###
log4j.rootLogger = debug,console ,fileAppender,dailyRollingFile,ROLLING_FILE,MAIL,DATABASE### \u8BBE\u7F6E\u8F93\u51FAsql\u7684\u7EA7\u522B\uFF0C\u5176\u4E2Dlogger\u540E\u9762\u7684\u5185\u5BB9\u5168\u90E8\u4E3Ajar\u5305\u4E2D\u6240\u5305\u542B\u7684\u5305\u540D ###
log4j.logger.org.apache=dubug
log4j.logger.java.sql.Connection=dubug
log4j.logger.java.sql.Statement=dubug
log4j.logger.java.sql.PreparedStatement=dubug
log4j.logger.java.sql.ResultSet=dubug### \u914D\u7F6E\u8F93\u51FA\u5230\u63A7\u5236\u53F0 ###
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%nmybatis-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><typeAliases><typeAlias type="com.geyao.mybatis.pojo.Blog" alias="Blog"/>
</typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC" /><!-- 配置数据库连接信息 --><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8" /><property name="username" value="root" /><property name="password" value="123" /></dataSource></environment></environments><mappers><!-- 注册userMapper.xml文件， userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml--><mapper resource="com/geyao/mybatis/mapper/BlogMapper.xml"/></mappers>
</configuration>
单元测试
com.geyao.mybatis.util
testSelectBlog类
package com.geyao.mybatis.mapper;import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.apache.ibatis.session.SqlSession;
import org.junit.Test;import com.geyao.mybatis.pojo.Blog;
import com.geyao.mybatis.util.MyBatisUtil;public class testSelectBlog {@Testpublic void testSelectBlogNoInterface() {SqlSession session =MyBatisUtil.getSqlSession();Blog blog =(Blog)session.selectOne("com.geyao.mybatis.mapper.BlogMapper.selectBlog", 101);session.close();System.out.println(blog);}
@Test
public void testSelectBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog(1);System.out.println(blog);
}@Test
public void testSelectBlog2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog2(1);System.out.println(blog);
}
@Test
public void testselectBlogByTitle() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByTitle("%g%");System.out.println(blogList);
}@Test
public void testselectBlogByTitle2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByTitle2("%g%");System.out.println(blogList);
}
@Test
public void testselectBlogBySort() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogBySort("title");System.out.println(blogList);
}
@Test
public void testselectBlogByPage() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByPage(2,2);System.out.println(blogList);
}
@Test
public void testselectBlogByPage1() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByPage1(2,2);System.out.println(blogList);
}
@Test
public void testselectBlogByPage2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Map<String, Object> map =new HashMap<String, Object>();map.put("offset", 2);map.put("pagesize", 2);List<Blog> blogList = blogMapper.selectBlogByPage2(map);System.out.println(blogList);
}@Test
public void testInsertBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog=new Blog();int count= blogMapper.insertBlog(blog);session.commit();session.close();System.out.println(blog);System.out.println("插入的"+count+"记录");
}@Test
public void testinsertBlogMysql() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog=new Blog();int count= blogMapper.insertBlogMysql(blog);session.commit();session.close();System.out.println(blog);System.out.println("插入的"+count+"记录");
}@Test
public void testupdateBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog=new Blog();blog.setId(1);blog.setTitle("geyao");blog.setStyle("balck");blog.setState("active");blog.setFeatured(false);blog.setAuthodId(2);int count= blogMapper.updateBlog(blog);session.commit();session.close();System.out.println(blog);System.out.println("修改"+count+"记录");
}
}
jar包
链接：https://pan.baidu.com/s/1g6NgzfLc5uK9S4VL-03lHg
提取码：4r2m
运行结果
目录结构
com.geyao.mybatis.mapper
BlogMapper类
package com.geyao.mybatis.mapper;import java.util.List;
import java.util.Map;import org.apache.ibatis.annotations.Param;import com.geyao.mybatis.pojo.Blog;public interface BlogMapper {Blog selectBlog(Integer id);Blog selectBlog2(Integer id);List<Blog> selectBlogByTitle(String title);List<Blog> selectBlogByTitle2(String title);List<Blog> selectBlogBySort(String column);List<Blog> selectBlogByPage(int offset,int pagesize);List<Blog> selectBlogByPage1(@Param(value="offset")int offset,@Param(value="pagesize")int pagesize);List<Blog> selectBlogByPage2(Map<String, Object>map);int insertBlog(Blog blog);int insertBlogMysql(Blog blog);int updateBlog(Blog blog);
}
BlogMapper.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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)-->
<mapper namespace="com.geyao.mybatis.mapper.BlogMapper"><!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回User类就是users表所对应的实体类--><!-- 根据id查询得到一个user对象--><resultMap type="Blog" id="blogResultMap"><id column="id" property="id" jdbcType="INTEGER"></id><result column="authod_id" property="authodId" jdbcType="INTEGER"/></resultMap><select id="selectBlog" parameterType="int" resultType="Blog">select id,title,authod_id as authodId,state,featured,stylefrom Blog where id=#{id}</select> <select id="selectBlog2" parameterType="int" resultMap="blogResultMap">select *from Blog where id=#{id}</select><select id="selectBlogByTitle" parameterType="String" resultMap="blogResultMap">select * from Blog where title like #{title}</select><select id="selectBlogByTitle2" parameterType="String" resultMap="blogResultMap">select * from Blog where title like '${value}'</select><select id="selectBlogBySort" parameterType="String" resultMap="blogResultMap">select * from Blog order by ${value}</select><select id="selectBlogByPage" resultMap="blogResultMap">select * from Blog limit #{0},#{1}</select><select id="selectBlogByPage1" resultMap="blogResultMap">select * from Blog limit #{offset},#{pagesize}</select><select id="selectBlogByPage2" resultMap="blogResultMap">select * from Blog limit #{offset},#{pagesize}</select><insert id="insertBlog" parameterType="Blog" useGeneratedKeys="true" keyProperty="id">INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><insert id="insertBlogOracle" parameterType="Blog" ><selectKey resultType="java.lang.Integer" order="BEFORE" keyProperty="id">select seq.nextval as id from dual</selectKey>INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><insert id="insertBlogMysql" parameterType="Blog" ><selectKey resultType="java.lang.Integer" order="AFTER" keyProperty="id">SELECT LAST_INSERT_ID()</selectKey>INSERT INTO Blog(title,authod_id,state,featured,style)VALUES(#{title},#{authodId},#{state},#{featured},#{style})</insert><update id="updateBlog" parameterType="Blog" >UPDATE BlogSETtitle = #{title},authod_id = #{authodId},state = #{state},featured = #{featured},
style= #{ style}WHERE id = #{id}</update>
</mapper>
com.geyao.mybatis.pojo
Blog类
package com.geyao.mybatis.pojo;public class Blog {private Integer id;private String title;private int authodId;private String state;private Boolean featured;private String style;public Blog() {super();this.title="未命名";this.authodId=4;this.state="NOT";this.featured=false;this.style="red"; }public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public int getAuthodId() {return authodId;}public void setAuthodId(int authodId) {this.authodId = authodId;}public String getState() {return state;}public void setState(String state) {this.state = state;}public Boolean getFeatured() {return featured;}public void setFeatured(Boolean featured) {this.featured = featured;}public String getStyle() {return style;}public void setStyle(String style) {this.style = style;}@Overridepublic String toString() {return "Blog [id=" + id + ", title=" + title + ", authodId=" + authodId + ", state=" + state + ", featured="+ featured + ", style=" + style + "]\n";}}
com.geyao.mybatis.util
MybatisUtil类
package com.geyao.mybatis.util;import java.io.InputStream;
import java.io.Reader;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class MyBatisUtil {private static SqlSessionFactory sqlSessionFactory =null;static {try {InputStream in = Resources.getResourceAsStream("mybatis-config.xml");sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}private MyBatisUtil() {}public static SqlSession getSqlSession() {return sqlSessionFactory.openSession();}
}
log4j.properties
### \u914D\u7F6E\u6839 ###
log4j.rootLogger = debug,console ,fileAppender,dailyRollingFile,ROLLING_FILE,MAIL,DATABASE### \u8BBE\u7F6E\u8F93\u51FAsql\u7684\u7EA7\u522B\uFF0C\u5176\u4E2Dlogger\u540E\u9762\u7684\u5185\u5BB9\u5168\u90E8\u4E3Ajar\u5305\u4E2D\u6240\u5305\u542B\u7684\u5305\u540D ###
log4j.logger.org.apache=dubug
log4j.logger.java.sql.Connection=dubug
log4j.logger.java.sql.Statement=dubug
log4j.logger.java.sql.PreparedStatement=dubug
log4j.logger.java.sql.ResultSet=dubug### \u914D\u7F6E\u8F93\u51FA\u5230\u63A7\u5236\u53F0 ###
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%nmybatis-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><typeAliases><typeAlias type="com.geyao.mybatis.pojo.Blog" alias="Blog"/>
</typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC" /><!-- 配置数据库连接信息 --><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8" /><property name="username" value="root" /><property name="password" value="123" /></dataSource></environment></environments><mappers><!-- 注册userMapper.xml文件， userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml--><mapper resource="com/geyao/mybatis/mapper/BlogMapper.xml"/></mappers>
</configuration>
单元测试
com.geyao.mybatis.util
testSelectBlog类
package com.geyao.mybatis.mapper;import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.apache.ibatis.session.SqlSession;
import org.junit.Test;import com.geyao.mybatis.pojo.Blog;
import com.geyao.mybatis.util.MyBatisUtil;public class testSelectBlog {@Testpublic void testSelectBlogNoInterface() {SqlSession session =MyBatisUtil.getSqlSession();Blog blog =(Blog)session.selectOne("com.geyao.mybatis.mapper.BlogMapper.selectBlog", 1);session.close();System.out.println(blog);}
@Test
public void testSelectBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog(1);System.out.println(blog);
}@Test
public void testSelectBlog2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog2(1);System.out.println(blog);
}
@Test
public void testselectBlogByTitle() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByTitle("%g%");System.out.println(blogList);
}@Test
public void testselectBlogByTitle2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByTitle2("%g%");System.out.println(blogList);
}
@Test
public void testselectBlogBySort() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogBySort("title");System.out.println(blogList);
}
@Test
public void testselectBlogByPage() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByPage(2,2);System.out.println(blogList);
}
@Test
public void testselectBlogByPage1() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList = blogMapper.selectBlogByPage1(2,2);System.out.println(blogList);
}
@Test
public void testselectBlogByPage2() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Map<String, Object> map =new HashMap<String, Object>();map.put("offset", 2);map.put("pagesize", 2);List<Blog> blogList = blogMapper.selectBlogByPage2(map);System.out.println(blogList);
}@Test
public void testInsertBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog=new Blog();int count= blogMapper.insertBlog(blog);session.commit();session.close();System.out.println(blog);System.out.println("插入的"+count+"记录");
}@Test
public void testinsertBlogMysql() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog=new Blog();int count= blogMapper.insertBlogMysql(blog);session.commit();session.close();System.out.println(blog);System.out.println("插入的"+count+"记录");
}@Test
public void testupdateBlog() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog(1);//Blog blog=new Blog();blog.setId(1);blog.setTitle("geyao");blog.setAuthodId(3);//blog.setStyle("balck");//blog.setState("active");//blog.setFeatured(false);//blog.setAuthodId(2);int count= blogMapper.updateBlog(blog);session.commit();session.close();System.out.println(blog);System.out.println("修改"+count+"记录");
}
@Test
public void testdeleteBlogById() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);int count= blogMapper.deleteBlogById(3);session.commit();session.close();System.out.println("删除的"+count+"记录");
}
@Test
public void testselectActiveBlogByTitle() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Blog> blogList=blogMapper.selectActiveBlogByTitle("o");session.close();System.out.println(blogList);
}
@Test
public void testselectActiveBlogByTitleOrStyle() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = new Blog();blog.setTitle("%o%");blog.setStyle("black");List<Blog> blogList=blogMapper.selectActiveBlogByTitleOrStyle(blog);session.close();System.out.println(blogList);
}
@Test
public void testselectBlogByCondition() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = new Blog();blog.setTitle("%o%");List<Blog> blogList=blogMapper.selectBlogByCondition(blog);session.close();System.out.println(blogList);
}
@Test
public void tesupdateBlogByCondition() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog(1);//Blog blog=new Blog();blog.setId(1);blog.setTitle("geyaonice");blog.setAuthodId(3);//blog.setStyle("balck");//blog.setState("active");//blog.setFeatured(false);//blog.setAuthodId(2);int count= blogMapper.updateBlogByCondition(blog);session.commit();session.close();System.out.println(blog);System.out.println("修改"+count+"记录");
}
@Test
public void testselectBlogByConditionTrim() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = new Blog();blog.setTitle("%o%");List<Blog> blogList=blogMapper.selectBlogByConditionTrim(blog);session.close();System.out.println(blogList);
}
@Test
public void tesupdateBlogByConditionTrim() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog = blogMapper.selectBlog(1);//Blog blog=new Blog();blog.setId(1);blog.setTitle("geyaonice");blog.setAuthodId(3);//blog.setStyle("balck");//blog.setState("active");//blog.setFeatured(false);//blog.setAuthodId(2);int count= blogMapper.updateBlogByConditionTrim(blog);session.commit();session.close();System.out.println(blog);System.out.println("修改"+count+"记录");
}
@Test
public void testdeleteBlogList() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);List<Integer> ids=Arrays.asList(2,3,4);int count= blogMapper.deleteBlogList(ids);session.commit();session.close();System.out.println("删除"+count+"记录");
}
@Test
public void testSelectBlogCacheLevelOne1() {SqlSession session =MyBatisUtil.getSqlSession();BlogMapper blogMapper =session.getMapper(BlogMapper.class);Blog blog1=blogMapper.selectBlog(1);System.out.println("结果已查询");Blog blog2=blogMapper.selectBlog(2);System.out.println("结果已查询");session.close();System.out.println("session关闭");}
}
jar包
链接：https://pan.baidu.com/s/1g6NgzfLc5uK9S4VL-03lHg
提取码：4r2m
运行结果
mybatis学习(42):mybatis的一级缓存相关推荐
- Mybatis学习笔记——Mybatis入门
文章目录 Mybatis入门 1.为什么要使用mybatis? 2.ORM 3.mybatis简介 4.mybatis框架 5.mybatis入门程序 5.1搭建环境 5.2 配置log4j 5.3 ...
- mybatis学习(2) - MyBatis Generate的使用
上一篇中我们介绍了mybatis的简单用法,这篇文章,我们在那基础之上学习一下她的另外一个实用插件,MyBatis Generate的使用. MBG是啥? MyBatis Generate一般我们简称 ...
- MyBatis学习：MyBatis的配置文件
1.本篇博文的背景和目的 我本人正在学习MyBatis框架,在原先了解并且懵懵懂懂使用的基础上,开始系统正式的学习.阐述了MVC架构模式和三层架构,回顾了JDBC连接数据库,建立了使用MyBatis和 ...
- mybatis学习(15):mybatis连接mysql数据库
目录结构 com.geyao.mybatis.mapper BlogMapper类 package com.geyao.mybatis.mapper;import com.geyao.mybatis. ...
- mybatis学习五-mybatis的多表联合查询
1. 一对一的关系 首先先看数据库 tb_user tb_orders 执行这条sql: 也就是查询所有的订单, 并每一个订单都联系上用户数据, 并再一次附上订单的id 也就是说, 从后面看, 就是每 ...
- Mybatis 详解--- 一级缓存、二级缓存
2019独角兽企业重金招聘Python工程师标准>>> Mybatis 为我们提供了一级缓存和二级缓存,可以通过下图来理解: ①.一级缓存是SqlSession级别的缓存.在操作数据 ...
- MyBatis框架：延迟加载策策略、一级缓存、二级缓存
MyBatis框架:延迟加载策略和缓存 Mybatis 延迟加载策略 1.1 何为延迟加载? 1.2 实现需求 1.3 使用association实现延迟加载 1.3.1 账户的持久层DAO接口 1. ...
- mybatis 详解------ 一级缓存、二级缓存（九）
mybatis 为我们提供了一级缓存和二级缓存,可以通过下图来理解: ①.一级缓存是SqlSession级别的缓存.在操作数据库时需要构造sqlSession对象,在对象中有一个数据结构(HashMa ...
- 禁用 MyBatis 一级缓存
MyBatis 一级缓存默认开启,是 session 级别.如果要禁用一级缓存,就要设置为 statement 级别,即: <setting name="localCacheScope ...
最新文章
- （七）STM32的RTC简单操作
- 用jstat摸清JVM线上系统情况
- 理解VMware Team中的虚拟网络
- 谈谈Visual Studio的缺点，比较Eclipse
- Vue静态资源的获取
- SpringBoot Bean配置
- 仅凭借一本薄薄的时间简史，征服了全球读者...
- 算法稳定币项目Basis Cash将于2月7日启动V2迁移计划
- WPF 动画执行后属性无法修改
- UVA10570 Meeting with Aliens【数学计算】
- jQuery Mobile 所有class选项，开发全解+完美注释
- spring boot访问zul页面总是变为下载页面
- leetcode刷题（32）——88. 合并两个有序数组
- Python 玩转数据 3 - NumPy ndarray Array Indexing, Slicing, Striding, View Subarray,Copy Subarray
- 机器人系统设计（五）
- 29、程序员的面试考题，要求用一个for循环打出乘法表。
- 2018-10-20-WPF-通过位处理合并图片
- Python社区采访Michael Kennedy
- java执行sql文件
- 一文揭秘阿里、腾讯、百度的薪资职级
热门文章
- nginx php访问日志配置,nginx php-fpm 输出php错误日志的配置方法
- android 涨潮动画加载_Android附带涨潮动画效果的曲线报表绘制
- java 反射 获取成员_java 反射获取成员
- python如何在exel中编程_如何使用Python以编程方式将行添加到现有Excel表中
- 常用注入 Script 方法
- 用实例分析H264 RTP payload
- VC++ 读取和保存文件对话框及默认目录
- [react] 你最喜欢React的哪一个特性（说一个就好）
- Taro+react开发（32） Please use the ‘new‘ operator, this DOM object constructor cannot be called as a fu
- 前端学习（3228）：createRef的使用