转载请标明出处:https://blog.csdn.net/men_ma/article/details/106847165.
本文出自 不怕报错 就怕不报错的小猿猿 的博客
@TOC
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- ********************** junit单元测试依赖 ********************** -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- ********************** Java Servlet API ********************** -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
<!-- ********************** Mybatis依赖 ********************** -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!-- ********************** Mysql JDBC驱动 ********************** -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<!-- ********************** 日志配置 ********************** -->
<!--记得修改mybatis.cfg.xml添加如下内容-->
<!--<setting name="logImpl" value="LOG4J2"/>-->
<!--核心log4j2jar包-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.9.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.9.1</version>
</dependency>
<!--web工程需要包含log4j-web,非web工程不需要-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>2.9.1</version>
</dependency>
</dependencies>
<build>
<resources>
<!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
<resource>
<directory>src/main/resources</directory>
<includes>
<include>jdbc.properties</include>
<include>*.xml</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<dependencies>
<!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
在导入pom依赖时,一定要把依赖的位置放清楚,博主在此特地声明强调,如下所示截图:
第一步复制放置的位置(properties标签内的两个maven开头的标签):
第二步复制放置的位置(dependencies整个标签的所有内容):
第三步复制放置的位置(整个resources标签内的内容):
第四步复制放置的位置(复制plugins标签内的那个plugin标签就可以了):
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1"></web-app>
接下来安装以下插件
Free mybatis plugin
Mybatis generater
mybatis tools
maven helper
这些插件的详细介绍
https://blog.csdn.net/yangshijin1988/article/details/63258960/
<?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>
<!-- 引入外部配置文件 -->
<properties resource="jdbc.properties"/>
<settings>
<setting name="logImpl" value="LOG4J2"/>
</settings>
<!-- 别名 -->
<typeAliases>
<!--<typeAlias type="com.javaxl.model.Book" alias="Book"/>-->
</typeAliases>
<!-- 配置mybatis运行环境 -->
<environments default="development">
<environment id="development">
<!-- type="JDBC" 代表使用JDBC的提交和回滚来管理事务 -->
<transactionManager type="jdbc"/>
<!-- mybatis提供了3种数据源类型,分别是:POOLED,UNPOOLED,JNDI -->
<!-- POOLED 表示支持JDBC数据源连接池 -->
<!-- UNPOOLED 表示不支持数据源连接池 -->
<!-- JNDI 表示支持外部数据源连接池 -->
<dataSource type="POOLED">
<property name="driver"
value="${jdbc.driver}"/>
<property name="url"
value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--<mapper resource="com/javaxl/mapper/BookMapper.xml"/>-->
</mappers>
</configuration>
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
<!-- 引入配置文件 -->
<properties resource="jdbc.properties"/>
<!--指定数据库jdbc驱动jar包的位置-->
<classPathEntry location="D:\\initPath\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
<!-- 一个数据库一个context -->
<context id="infoGuardian">
<!-- 注释 -->
<commentGenerator>
<property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
<property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
</commentGenerator>
<!-- jdbc连接 -->
<jdbcConnection driverClass="${jdbc.driver}"
connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>
<!-- 类型转换 -->
<javaTypeResolver>
<!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) -->
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 01 指定javaBean生成的位置 -->
<!-- targetPackage:指定生成的model生成所在的包名 -->
<!-- targetProject:指定在该项目下所在的路径 -->
<javaModelGenerator targetPackage="com.xiaoqing.model"
targetProject="src/main/java">
<!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否对model添加构造函数 -->
<property name="constructorBased" value="true"/>
<!-- 是否针对string类型的字段在set的时候进行trim调用 -->
<property name="trimStrings" value="false"/>
<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法,只有构造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!-- 02 指定sql映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.xiaoqing.mapper"
targetProject="src/main/java">
<!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 03 生成XxxMapper接口 -->
<!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
<!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
<!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
<javaClientGenerator targetPackage="com.xiaoqing.mapper"
targetProject="src/main/java" type="XMLMAPPER">
<!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model, true:com.oop.eksp.user.model.[schemaName] -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!-- 配置表信息 -->
<!-- schema即为数据库名 -->
<!-- tableName为对应的数据库表 -->
<!-- domainObjectName是要生成的实体类 -->
<!-- enable*ByExample是否生成 example类 -->
<!--<table schema="" tableName="t_book" domainObjectName="Book"-->
<!--enableCountByExample="false" enableDeleteByExample="false"-->
<!--enableSelectByExample="false" enableUpdateByExample="false">-->
<!--<!– 忽略列,不生成bean 字段 –>-->
<!--<!– <ignoreColumn column="FRED" /> –>-->
<!--<!– 指定列的java数据类型 –>-->
<!--<!– <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> –>-->
<!--</table>-->
<table schema="" tableName="t_mvc_Book" domainObjectName="Book"
enableCountByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" enableUpdateByExample="false">
<!-- 忽略列,不生成bean 字段 -->
<!-- <ignoreColumn column="FRED" /> -->
<!-- 指定列的java数据类型 -->
<!-- <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> -->
</table>
</context>
</generatorConfiguration>
配置此文件时需要修改的几个地方(如下所示):
第一处(maven仓库中的数据库jar包的地址):
第二处(配置自动生成的实体类、映射文件及dao类的包名):
第三处(数据库中的表名及实体类的类名):
mybatis-generator:generate -e
推荐博客:
解决逆向生成genaratorConfig的头:http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd报红的问题
jdbc.properties:
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123
genaratorConfig.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
<!-- 引入配置文件 -->
<properties resource="jdbc.properties"/>
<!--指定数据库jdbc驱动jar包的位置-->
<classPathEntry location="D:\\initPath\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
<!-- 一个数据库一个context -->
<context id="infoGuardian">
<!-- 注释 -->
<commentGenerator>
<property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
<property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
</commentGenerator>
<!-- jdbc连接 -->
<jdbcConnection driverClass="${jdbc.driver}"
connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>
<!-- 类型转换 -->
<javaTypeResolver>
<!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) -->
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 01 指定javaBean生成的位置 -->
<!-- targetPackage:指定生成的model生成所在的包名 -->
<!-- targetProject:指定在该项目下所在的路径 -->
<javaModelGenerator targetPackage="com.xiaoqing.model"
targetProject="src/main/java">
<!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否对model添加构造函数 -->
<property name="constructorBased" value="true"/>
<!-- 是否针对string类型的字段在set的时候进行trim调用 -->
<property name="trimStrings" value="false"/>
<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法,只有构造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!-- 02 指定sql映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.xiaoqing.mapper"
targetProject="src/main/java">
<!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 03 生成XxxMapper接口 -->
<!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
<!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
<!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
<javaClientGenerator targetPackage="com.xiaoqing.mapper"
targetProject="src/main/java" type="XMLMAPPER">
<!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model, true:com.oop.eksp.user.model.[schemaName] -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!-- 配置表信息 -->
<!-- schema即为数据库名 -->
<!-- tableName为对应的数据库表 -->
<!-- domainObjectName是要生成的实体类 -->
<!-- enable*ByExample是否生成 example类 -->
<!--<table schema="" tableName="t_book" domainObjectName="Book"-->
<!--enableCountByExample="false" enableDeleteByExample="false"-->
<!--enableSelectByExample="false" enableUpdateByExample="false">-->
<!--<!– 忽略列,不生成bean 字段 –>-->
<!--<!– <ignoreColumn column="FRED" /> –>-->
<!--<!– 指定列的java数据类型 –>-->
<!--<!– <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> –>-->
<!--</table>-->
<table schema="" tableName="t_mvc_Book" domainObjectName="Book"
enableCountByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" enableUpdateByExample="false">
<!-- 忽略列,不生成bean 字段 -->
<!-- <ignoreColumn column="FRED" /> -->
<!-- 指定列的java数据类型 -->
<!-- <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> -->
</table>
</context>
</generatorConfiguration>
mybatis.cfg.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>
<!-- 引入外部配置文件 -->
<properties resource="jdbc.properties"/>
<settings>
<setting name="logImpl" value="LOG4J2"/>
</settings>
<!-- 别名 -->
<typeAliases>
<!--<typeAlias type="com.javaxl.model.Book" alias="Book"/>-->
</typeAliases>
<!-- 配置mybatis运行环境 -->
<environments default="development">
<environment id="development">
<!-- type="JDBC" 代表使用JDBC的提交和回滚来管理事务 -->
<transactionManager type="jdbc"/>
<!-- mybatis提供了3种数据源类型,分别是:POOLED,UNPOOLED,JNDI -->
<!-- POOLED 表示支持JDBC数据源连接池 -->
<!-- UNPOOLED 表示不支持数据源连接池 -->
<!-- JNDI 表示支持外部数据源连接池 -->
<dataSource type="POOLED">
<property name="driver"
value="${jdbc.driver}"/>
<property name="url"
value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/xiaoqing/mapper/BookMapper.xml"/>
</mappers>
</configuration>
log4j2.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!-- status : 指定log4j本身的打印日志的级别.ALL< Trace < DEBUG < INFO < WARN < ERROR
< FATAL < OFF。 monitorInterval : 用于指定log4j自动重新配置的监测间隔时间,单位是s,最小是5s. -->
<Configuration status="WARN" monitorInterval="30">
<Properties>
<!-- 配置日志文件输出目录 ${sys:user.home} -->
<Property name="LOG_HOME">/root/workspace/lucenedemo/logs</Property>
<property name="ERROR_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/error</property>
<property name="WARN_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/warn</property>
<property name="PATTERN">%d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n</property>
</Properties>
<Appenders>
<!--这个输出控制台的配置 -->
<Console name="Console" target="SYSTEM_OUT">
<!-- 控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
<ThresholdFilter level="trace" onMatch="ACCEPT"
onMismatch="DENY" />
<!-- 输出日志的格式 -->
<!-- %d{yyyy-MM-dd HH:mm:ss, SSS} : 日志生产时间 %p : 日志输出格式 %c : logger的名称
%m : 日志内容,即 logger.info("message") %n : 换行符 %C : Java类名 %L : 日志输出所在行数 %M
: 日志输出所在方法名 hostName : 本地机器名 hostAddress : 本地ip地址 -->
<PatternLayout pattern="${PATTERN}" />
</Console>
<!--文件会打印出所有信息,这个log每次运行程序会自动清空,由append属性决定,这个也挺有用的,适合临时测试用 -->
<!--append为TRUE表示消息增加到指定文件中,false表示消息覆盖指定的文件内容,默认值是true -->
<File name="log" fileName="logs/test.log" append="false">
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
</File>
<!-- 这个会打印出所有的info及以下级别的信息,每次大小超过size, 则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩,作为存档 -->
<RollingFile name="RollingFileInfo" fileName="${LOG_HOME}/info.log"
filePattern="${LOG_HOME}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log">
<!--控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
<ThresholdFilter level="info" onMatch="ACCEPT"
onMismatch="DENY" />
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
<Policies>
<!-- 基于时间的滚动策略,interval属性用来指定多久滚动一次,默认是1 hour。 modulate=true用来调整时间:比如现在是早上3am,interval是4,那么第一次滚动是在4am,接着是8am,12am...而不是7am. -->
<!-- 关键点在于 filePattern后的日期格式,以及TimeBasedTriggeringPolicy的interval, 日期格式精确到哪一位,interval也精确到哪一个单位 -->
<!-- log4j2的按天分日志文件 : info-%d{yyyy-MM-dd}-%i.log -->
<TimeBasedTriggeringPolicy interval="1"
modulate="true" />
<!-- SizeBasedTriggeringPolicy:Policies子节点, 基于指定文件大小的滚动策略,size属性用来定义每个日志文件的大小. -->
<!-- <SizeBasedTriggeringPolicy size="2 kB" /> -->
</Policies>
</RollingFile>
<RollingFile name="RollingFileWarn" fileName="${WARN_LOG_FILE_NAME}/warn.log"
filePattern="${WARN_LOG_FILE_NAME}/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log">
<ThresholdFilter level="warn" onMatch="ACCEPT"
onMismatch="DENY" />
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
<Policies>
<TimeBasedTriggeringPolicy />
<SizeBasedTriggeringPolicy size="2 kB" />
</Policies>
<!-- DefaultRolloverStrategy属性如不设置,则默认为最多同一文件夹下7个文件,这里设置了20 -->
<DefaultRolloverStrategy max="20" />
</RollingFile>
<RollingFile name="RollingFileError" fileName="${ERROR_LOG_FILE_NAME}/error.log"
filePattern="${ERROR_LOG_FILE_NAME}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd-HH-mm}-%i.log">
<ThresholdFilter level="error" onMatch="ACCEPT"
onMismatch="DENY" />
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
<Policies>
<!-- log4j2的按分钟 分日志文件 : warn-%d{yyyy-MM-dd-HH-mm}-%i.log -->
<TimeBasedTriggeringPolicy interval="1"
modulate="true" />
<!-- <SizeBasedTriggeringPolicy size="10 MB" /> -->
</Policies>
</RollingFile>
</Appenders>
<!--然后定义logger,只有定义了logger并引入的appender,appender才会生效 -->
<Loggers>
<!--过滤掉spring和mybatis的一些无用的DEBUG信息 -->
<logger name="org.springframework" level="INFO"></logger>
<logger name="org.mybatis" level="INFO"></logger>
<!-- 第三方日志系统 -->
<logger name="org.springframework" level="ERROR" />
<logger name="org.hibernate" level="ERROR" />
<logger name="org.apache.struts2" level="ERROR" />
<logger name="com.opensymphony.xwork2" level="ERROR" />
<logger name="org.jboss" level="ERROR" />
<!-- 配置日志的根节点 -->
<root level="all">
<appender-ref ref="Console" />
<appender-ref ref="RollingFileInfo" />
<appender-ref ref="RollingFileWarn" />
<appender-ref ref="RollingFileError" />
</root>
</Loggers>
</Configuration>
Book.java:
package com.xiaoqing.model;
public class Book {
private Integer bid;
private String bname;
private Float price;
public Book(Integer bid, String bname, Float price) {
this.bid = bid;
this.bname = bname;
this.price = price;
}
@Override
public String toString() {
return "Book{" +
"bid=" + bid +
", bname='" + bname + '\'' +
", price=" + price +
'}';
}
public Book() {
super();
}
public Integer getBid() {
return bid;
}
public void setBid(Integer bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
}
BookMapper.java:
package com.xiaoqing.mapper;
import com.xiaoqing.model.Book;
public interface BookMapper {
int deleteByPrimaryKey(Integer bid);
int insert(Book record);
int insertSelective(Book record);
Book selectByPrimaryKey(Integer bid);
int updateByPrimaryKeySelective(Book record);
int updateByPrimaryKey(Book record);
}
BookMapper.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="com.xiaoqing.mapper.BookMapper" >
<resultMap id="BaseResultMap" type="com.xiaoqing.model.Book" >
<constructor >
<idArg column="bid" jdbcType="INTEGER" javaType="java.lang.Integer" />
<arg column="bname" jdbcType="VARCHAR" javaType="java.lang.String" />
<arg column="price" jdbcType="REAL" javaType="java.lang.Float" />
</constructor>
</resultMap>
<sql id="Base_Column_List" >
bid, bname, price
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from t_mvc_book
where bid = #{bid,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from t_mvc_book
where bid = #{bid,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.xiaoqing.model.Book" >
insert into t_mvc_book (bid, bname, price
)
values (#{bid,jdbcType=INTEGER}, #{bname,jdbcType=VARCHAR}, #{price,jdbcType=REAL}
)
</insert>
<insert id="insertSelective" parameterType="com.xiaoqing.model.Book" >
insert into t_mvc_book
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="bid != null" >
bid,
</if>
<if test="bname != null" >
bname,
</if>
<if test="price != null" >
price,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="bid != null" >
#{bid,jdbcType=INTEGER},
</if>
<if test="bname != null" >
#{bname,jdbcType=VARCHAR},
</if>
<if test="price != null" >
#{price,jdbcType=REAL},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.xiaoqing.model.Book" >
update t_mvc_book
<set >
<if test="bname != null" >
bname = #{bname,jdbcType=VARCHAR},
</if>
<if test="price != null" >
price = #{price,jdbcType=REAL},
</if>
</set>
where bid = #{bid,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.xiaoqing.model.Book" >
update t_mvc_book
set bname = #{bname,jdbcType=VARCHAR},
price = #{price,jdbcType=REAL}
where bid = #{bid,jdbcType=INTEGER}
</update>
</mapper>
BookService:
package com.xiaoqing.service;
import com.xiaoqing.model.Book;
/**
* @author 晴sister
* @site https://blog.csdn.net/men_ma
* @company
* @create 2020-10-10 0:48
*/
public interface BookService {
int deleteByPrimaryKey(Integer bid);
Book selectByPrimaryKey(Integer bid);
}
BookServiceImpl:
package com.xiaoqing.service.impl;
import com.xiaoqing.mapper.BookMapper;
import com.xiaoqing.model.Book;
import com.xiaoqing.service.BookService;
/**
* @author 晴sister
* @site https://blog.csdn.net/men_ma
* @company
* @create 2020-10-100:52
*/
public class BookServiceImpl implements BookService {
private BookMapper bookMapper;
public BookMapper getBookMapper() {
return bookMapper;
}
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
@Override
public int deleteByPrimaryKey(Integer bid) {
return bookMapper.deleteByPrimaryKey(bid);
}
@Override
public Book selectByPrimaryKey(Integer bid) {
return bookMapper.selectByPrimaryKey(bid);
}
}
SessionUtil:
package com.xiaoqing.utils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.InputStream;
/**
* @author 小李飞刀
* @site www.javaxl.com
* @company xxx公司
* @create 2018-12-10 21:59
*/
public class SessionUtil {
private static SqlSessionFactory sessionFactory;
private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>();
static {
InputStream resourceAsStream = SessionUtil.class.getResourceAsStream("/mybatis.cfg.xml");
sessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
}
public static SqlSession openSession() {
SqlSession session = threadLocal.get();
if (null == session) {
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
public static void main(String[] args) {
SqlSession session = openSession();
System.out.println(session.getConnection());
session.close();
// System.out.println(session.getConnection());
}
}
BookServiceImplTest:
package com.xiaoqing.service.impl;
import com.xiaoqing.mapper.BookMapper;
import com.xiaoqing.service.BookService;
import com.xiaoqing.utils.SessionUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* @author 晴sister
* @site https://blog.csdn.net/men_ma
* @company
* @create 2020-10-100:57
*/
public class BookServiceImplTest {
private BookService bookService;
private SqlSession sqlSession;
@Before
public void setUp() throws Exception {
BookServiceImpl service=new BookServiceImpl();
sqlSession= SessionUtil.openSession();
BookMapper mapper = sqlSession.getMapper(BookMapper.class);
System.out.println("mapper:"+mapper);
service.setBookMapper(mapper);
bookService=service;
System.out.println(((BookServiceImpl) bookService).getBookMapper());
}
@After
public void setDown() throws Exception {
sqlSession.commit();
sqlSession.close();
}
@Test
public void deleteByPrimaryKey() {
System.out.println("测试有事务的方法");
System.out.println(this.bookService.deleteByPrimaryKey(2));
}
@Test
public void selectByPrimaryKey() {
System.out.println("测试没有事务的方法");
System.out.println(this.bookService.selectByPrimaryKey(1));
}
}