我要评论前言
开博客这是第一次写系列文章，从内心上讲是有点担心自己写不好，写不全，毕竟是作为java/mybatis学习的过程想把学习的路线和遇到的问题都总结下来，也让知识点在脑海里能形成一个体系。
开发环境
idea2016、mybatis3、sqlserver2012
pom.xml、mybatis.xml、log4j.properties
先贴上pom.xml是因为他直接和搭建开发环境和测试环境有关系，mybatis.xml则是连接数据库，log4j.properties在学习阶段配置上有助于我们观察sql的执行情况。
1、pom.xml
<dependencies> <dependency> <groupid>org.mybatis</groupid> <artifactid>mybatis</artifactid> <version>3.4.2</version> </dependency> <dependency> <groupid>com.microsoft.sqlserver</groupid> <artifactid>sqljdbc4</artifactid> <version>4.0</version> </dependency> <dependency> <groupid>commons-dbcp</groupid> <artifactid>commons-dbcp</artifactid> <version>1.4</version> </dependency> <dependency> <groupid>junit</groupid> <artifactid>junit</artifactid> <version>4.10</version> </dependency> <dependency> <groupid>log4j</groupid> <artifactid>log4j</artifactid> <version>1.2.17</version> </dependency> </dependencies>
2、mybatis.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>
<!-- mybatis针对sqlserver进行的配置 -->
<typealiases>
<typealias alias="user" type="com.autohome.model.user"/>
<typealias alias="teacher" type="com.autohome.model.teacher" />
<typealias alias="student" type="com.autohome.model.student" />
</typealiases>
<environments default="development">
<environment id="development">
<transactionmanager type="jdbc"/>
<datasource type="pooled">
<property name="driver" value="com.microsoft.sqlserver.jdbc.sqlserverdriver"/>
<property name="url" value="jdbc:sqlserver://localhost:1433;databasename=test"/>
<property name="username" value="sa"/>
<property name="password" value="0"/>
</datasource>
</environment>
</environments>
<mappers>
<mapper resource="mapper/user.xml"/>
<mapper resource="mapper/student.xml"/>
</mappers>
</configuration>
3、log4j.properties
### log4j配置 ###
### 与spring结合需要在web.xml中指定此文件位置，并添加监听器 ###
#定义log4j的输出级别和输出目的地（目的地可以自定义名称，和后面的对应）
#[ level ] , appendername1 , appendername2
log4j.rootlogger=debug,console,file
#-----------------------------------#
#1 定义日志输出目的地为控制台
log4j.appender.console = org.apache.log4j.consoleappender
log4j.appender.console.target = system.out
log4j.appender.console.threshold=debug
####可以灵活地指定日志输出格式，下面一行是指定具体的格式 ###
#%c: 输出日志信息所属的类目，通常就是所在类的全名
#%m: 输出代码中指定的消息,产生的日志具体信息
#%n: 输出一个回车换行符，windows平台为"/r/n"，unix平台为"/n"输出日志信息换行
log4j.appender.console.layout = org.apache.log4j.patternlayout
log4j.appender.console.layout.conversionpattern=[%c]-%m%n
#-----------------------------------#
#2 文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.file = org.apache.log4j.rollingfileappender
#日志文件输出目录
log4j.appender.file.file=log/tibet.log
#定义文件最大大小
log4j.appender.file.maxfilesize=10mb
###输出日志信息###
#最低级别
log4j.appender.file.threshold=error
log4j.appender.file.layout=org.apache.log4j.patternlayout
log4j.appender.file.layout.conversionpattern=[%p][%d{yy-mm-dd}][%c]%m%n
#-----------------------------------#
#3 druid
log4j.logger.druid.sql=info
log4j.logger.druid.sql.datasource=info
log4j.logger.druid.sql.connection=info
log4j.logger.druid.sql.statement=info
log4j.logger.druid.sql.resultset=info
#4 mybatis 显示sql语句部分
log4j.logger.org.mybatis=debug
#log4j.logger.cn.tibet.cas.dao=debug
#log4j.logger.org.mybatis.common.jdbc.simpledatasource=debug#
#log4j.logger.org.mybatis.common.jdbc.scriptrunner=debug#
#log4j.logger.org.mybatis.sqlmap.engine.impl.sqlmapclientdelegate=debug#
#log4j.logger.java.sql.connection=debug
log4j.logger.java.sql=debug
log4j.logger.java.sql.statement=debug
log4j.logger.java.sql.resultset=debug
log4j.logger.java.sql.preparedstatement=debug
配置mapper.xml
mapper.xml在mybatis.xml是专职处理sql的一个环节，各种映射和实现都在这里处理
<?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.autohome.mapper.user">
<!-- 查询全部用户 -->
<select id="queryusers" resulttype="com.autohome.model.user">
select * from t_userinfo
</select>
<!-- 按照id查询 -->
<select id="queryuserbyid" parametertype="int" resulttype="com.autohome.model.user">
select * from t_userinfo where id=#{id}
</select>
<select id="queryuserbyaddress" resulttype="com.autohome.model.user">
select * from t_userinfo where name=#{name,javatype=string,jdbctype=varchar} and address=#{address}
</select>
<!-- 添加用户 -->
<insert id="insertusers" parametertype="com.autohome.model.user">
insert into t_userinfo (name,address) values(#{name},#{address})
</insert>
<!-- 修改用户 -->
<update id="updateusers" parametertype="com.autohome.model.user">
update t_userinfo set name=#{name},address=#{address} where id=#{id}
</update>
<!-- 删除用户 -->
<delete id="deleteusers" parametertype="int">
delete t_userinfo where id=#{id}
</delete>
</mapper>
建立单元测试
1、准备工作，我建立的是控制台程序，所以在使用sqlsession前先创建sqlsessionfactory。当然，还要加载log4j.properties
sqlsessionfactory sqlsessionfactory=null;
@before
public void beforeclass(){
try {
inputstream is=resources.getresourceasstream("log4j.properties");
propertyconfigurator.configure(is);
reader reader = resources.getresourceasreader("mybatis.xml");
sqlsessionfactory= new sqlsessionfactorybuilder().build(reader);
} catch (ioexception e) {
e.printstacktrace();
}
}
2、queryusers
@test
public void queryusers() throws exception {
//线程不安全类型，放在方法体内
sqlsession sqlsession=null;
try {
sqlsession=sqlsessionfactory.opensession();
list<user> list = sqlsession.selectlist("com.autohome.mapper.user.queryusers");
system.out.println("size:"+list.size());
} catch (exception e) {
e.printstacktrace();
}finally {
sqlsession.close();
}
}
3、queryuserbyid
@test
public void queryuserbyid() {
sqlsession sqlsession=null;
try{
sqlsession=sqlsessionfactory.opensession();
user user = sqlsession.selectone("com.autohome.mapper.user.queryuserbyid",2);
system.out.println("id:"+user.getid()+",name:"+user.getname()+","+user.getaddress());
}catch(exception e){
e.printstacktrace();
}finally {
sqlsession.close();
}
}
4、insertuser
@test
public void insertuser(){
sqlsession sqlsession=null;
try{
sqlsession=sqlsessionfactory.opensession();
user user =new user();
user.setname("kobe");
user.setaddress("usa");
int result = sqlsession.insert("com.autohome.mapper.user.insertusers",user);
sqlsession.commit();
if(result>0){
system.out.println("insert success....");
}else{
system.out.println("insert error....");
}
}catch(exception e){
e.printstacktrace();
}finally {
sqlsession.close();
}
}
5、updateuser
@test
public void updateuser(){
sqlsession sqlsession=null;
try{
sqlsession=sqlsessionfactory.opensession();
user user =new user();
user.setid(36);
user.setname("kobe");
user.setaddress("usa");
int result = sqlsession.update("com.autohome.mapper.user.updateusers",user);
sqlsession.commit();
if(result>0){
system.out.println("update success....");
}else{
system.out.println("update error....");
}
}catch(exception e){
e.printstacktrace();
}finally {
sqlsession.close();
}
}
6、deleteuser
@test
public void deleteuser(){
sqlsession sqlsession=null;
try{
sqlsession=sqlsessionfactory.opensession();
int result = sqlsession.delete("com.autohome.mapper.user.deleteusers",49);
sqlsession.commit();
if(result>0){
system.out.println("delete success....");
}else{
system.out.println("delete error....");
}
}catch(exception e){
e.printstacktrace();
}finally {
sqlsession.close();
}
}
总结
添加、修改、删除的操作要调用sqlsession.commit(),不然数据无法入库的，我刚开始就忘记了这个。
以上所述是小编给大家介绍的mybatis中sqlsession实现增删改查案例，希望对大家有所帮助
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