mybatis学习(33):动态sql if

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);
}

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><!-- crud --><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><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>
</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%n

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><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%n

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><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 = 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);
}
}

jar包

链接：https://pan.baidu.com/s/1g6NgzfLc5uK9S4VL-03lHg
提取码：4r2m

运行结果

 

 

 

 

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sql(join on 和where的执行顺序）

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mybatis学习(34):动态sql-choose

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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…
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hive关于left join 和join时候on条件总结

hive关于left join 和join时候on条件总结

hive中使用join时候on条件 1、如果 select * from a left join b on(a.字段b.字段) 工作正常 2、如果 select * from a left join b on(a.字段b.字段&#xff0c;b.字段某值&#xff0c;b.……) 工作正常 3、如果 select * from a left join b on(a.字段b.字段&#xff0c;a.字…
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mybatis学习(35):sql-where

mybatis学习(35):sql-where

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…
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You get a dream...you gotta protect it.

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Dont ever let somebody tell you...you cant do something. You get a dream...you gotta protect it. If you want something,go get it. MOVIE 《当幸福来敲门》 转载于:https://www.cnblogs.com/mtc/archive/2008/07/03/1235079.html
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mybatis学习(36):动态sql-set

mybatis学习(36):动态sql-set

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…
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从10亿光年到0.1飞米的世界 (经典！震撼！）

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高效、稳定开发功能的一些心得

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Flume与Kafka整合案例详解

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mybatis学习(37):动态sql-trim

mybatis学习(37):动态sql-trim

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…
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SQL-简单查询

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/*人员&#xff1a;LDH功能&#xff1a;SQL-简单查询日期&#xff1a;2018-7-18*/USE TSQLFundamentals2008; GO-- Select some columns information. SELECT empid,lastname,firstname,address,city,country FROM HR.Employees;-- GROUP BY SELECT 国家 country,COUNT(1) AS …
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mybatis学习(38):动态sql-foreach

mybatis学习(38):动态sql-foreach

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…
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hive 的条件判断（if、coalesce、case）

hive 的条件判断（if、coalesce、case）

原文地址&#xff1a;http://www.folkstalk.com/2011/11/conditional-functions-in-hive.html CONDITIONAL FUNCTIONS IN HIVE Hive supports three types of conditional functions. These functions are listed below:IF( Test Condition, True Value, False Value ) The IF …
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黑盒测试方法揭密

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mybatis学习(39):动态sql片段

mybatis学习(39):动态sql片段

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…
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自定义Flume拦截器，并将收集的日志存储到Kafka中（案例）

自定义Flume拦截器，并将收集的日志存储到Kafka中（案例）

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