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MyBatis开发入门
搭建MyBatis框架开发环境
在自己建的的项目建立个lib文件
然后导入包
3.两个jar包部署到项目中和为项目添加测试类库
4.配置数据库
mybatis-config.xml里面的配置：
<?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><!-- 配置内容在这里 -->
</configuration><!-- 注：<configuration>是根节点，后面所有的配置都要放在<configuration>节点下 -->
<!-- 配置内容在这里 -->：连接数据库
<?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><!-- 配置内容在这里 --><environments default="development"><environment id="development"><transactionManager type="JDBC" /><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/frame_db" /><property name="username" value="root" /><property name="password" value="123456" /></dataSource></environment>
</environments> <!-- SQL语句映射文件地址配置 -->
<mappers><mapper resource="" />
</mappers></configuration>数据库另外一种动态配置
条件查询
如何只查询出供应商编码为“HB GYS001”的供应商信息?
环境配置好了，就建立
在src中建立一个包 entity
src
entity
建立供应商的实体
package entity;public class Provider {private String procode;private String proname;private String prodesc;private String procontact;private String prophone;private String proaddress;private String profax;private int createdby;private String creationdate;public String getProcode() {return procode;}public void setProcode(String procode) {this.procode = procode;}public String getProname() {return proname;}public void setProname(String proname) {this.proname = proname;}public String getProdesc() {return prodesc;}public void setProdesc(String prodesc) {this.prodesc = prodesc;}public String getProcontact() {return procontact;}public void setProcontact(String procontact) {this.procontact = procontact;}public String getProphone() {return prophone;}public void setProphone(String prophone) {this.prophone = prophone;}public String getProaddress() {return proaddress;}public void setProaddress(String proaddress) {this.proaddress = proaddress;}public String getProfax() {return profax;}public void setProfax(String profax) {this.profax = profax;}public int getCreatedby() {return createdby;}public void setCreatedby(int createdby) {this.createdby = createdby;}public String getCreationdate() {return creationdate;}public void setCreationdate(String creationdate) {this.creationdate = creationdate;}
}
注意：是在包mapper下建立，ProviderMapper.xml
这是固定的：
<?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="ProviderMapper"><!-- SQL映射写在这里 --></mapper>resources
mapper
ProviderMapper.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="ProviderMapper"><!-- SQL映射写在这里 --><select id="findAllProvider" resultType="entity.Provider" parameterType="String"><!-- (1）查询供应商编码（ proCode）为“HB_GYS001”的供应商名称、联系人和联系电话等信息 -->select * from smbms_provider where proCode=#{proCode}</select>
</mapper>
然后要在：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><!-- 配置内容在这里 --><environments default="development"><environment id="development"><transactionManager type="JDBC" /><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/frame_db" /><property name="username" value="root" /><property name="password" value="123456" /></dataSource></environment>
</environments> <!-- SQL语句映射文件地址配置 -->
<mappers><mapper resource="mapper/ProviderMapper.xml" /> 这里写这个
</mappers></configuration>test
ProviderMapperTest:
import java.io.IOException;
import java.io.InputStream;
import java.util.List;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;import entity.Provider;public class ProviderMapperTest {@Testpublic void testFindAllUser() throws IOException{//1.加载mybatis核心配置文件InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");//2.获取SqlSessionFactory对象SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);//3.得到执行sql的对象SqlSession SqlSession sqlSession = sqlSessionFactory.openSession();//4.执行sql语句List<Provider> list = sqlSession.selectList("ProviderMapper.findAllProvider","HB_GYS001");//5.处理结果for (Provider smbms_provider: list) {System.out.println("编号："+smbms_provider.getProcode()+"，供应商名："+smbms_provider.getProname()+"主要产品"+smbms_provider.getProdesc()+"姓名"+smbms_provider.getProcontact()+"电话"+smbms_provider.getProphone()+"地址"+smbms_provider.getProaddress()+"Fax:"+smbms_provider.getProfax()+"By:"+smbms_provider.getCreatedby()+"时间"+smbms_provider.getCreationdate());}//6.关闭数据库会话sqlSession.close();}}