java+maven+sqlserver使用mybatis
Posted 张亚南
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第一部分：基本实现
@参考文章，在此基础上略作修改
1，新建maven项目JavaMybatis导入依赖
<dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>sqljdbc4</artifactId> <version>4.0</version> </dependency> </dependencies>
2，com.mybatis包下新建Yanan.java
package com.mybatis; public class Yanan { private int iid; private String ifullname; private String iloginname; private String ipassword; public Yanan() { } public Yanan(int id, String name) { this.iid = id; this.ifullname = name; } public String getIfullname() { return ifullname; } public int getIid() { return iid; } public void setIid(int iid) { this.iid = iid; } public void setIfullname(String ifullname) { this.ifullname = ifullname; } public String getIloginname() { return iloginname; } public void setIloginname(String iloginname) { this.iloginname = iloginname; } public String getIpassword() { return ipassword; } public void setIpassword(String ipassword) { this.ipassword = ipassword; } }
3，根目录下新建Yanan.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="Yanan"> <select id="selectUser" parameterType="int" resultType="Yanan"> SELECT * FROM Yanan WHERE id = #{id} </select> <select id="selectUsers" resultType="Yanan"> SELECT * FROM Yanan </select> </mapper>
4，根目录下新建configuration.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 alias="Yanan" type="com.mybatis.Yanan"></typeAlias> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"></transactionManager> <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="yanan" /> </dataSource> </environment> </environments> <mappers> <mapper resource="Yanan.xml"/> </mappers> </configuration>
5.com.controller包下新建测试文件
package com.controller; import java.io.IOException; import java.io.Reader; 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 com.mybatis.Yanan; public class Test { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub String resource = "configuration.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); SqlSession session = ssf.openSession(); try{ Yanan user = session.selectOne("selectUser", 1); System.out.println(user.getIfullname()); System.out.println(user); System.out.println("--------------分隔线---------------"); List<Yanan> users = session.selectList("selectUsers"); for(int i=0; i<users.size(); i++) { System.out.println(users.get(i).getIfullname()); } } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } } }
源码包下载：JavaMybatis.rar
建表语句：
/* Navicat SQL Server Data Transfer Source Server : . Source Server Version : 105000 Source Host : .:1433 Source Database : test Source Schema : dbo Target Server Type : SQL Server Target Server Version : 105000 File Encoding : 65001 Date: 2018-09-04 13:49:17 */ -- ---------------------------- -- Table structure for yanan -- ---------------------------- DROP TABLE [dbo].[yanan] GO CREATE TABLE [dbo].[yanan] ( [id] int NOT NULL IDENTITY(1,1) , [ifullname] varchar(255) NULL , [iloginname] varchar(255) NULL , [ipassword] varchar(255) NULL ) GO -- ---------------------------- -- Records of yanan -- ---------------------------- SET IDENTITY_INSERT [dbo].[yanan] ON GO INSERT INTO [dbo].[yanan] ([id], [ifullname], [iloginname], [ipassword]) VALUES (N\'1\', N\'sd\', N\'fd\', N\'sd\') GO GO SET IDENTITY_INSERT [dbo].[yanan] OFF GO -- ---------------------------- -- Indexes structure for table yanan -- ---------------------------- -- ---------------------------- -- Primary Key structure for table yanan -- ---------------------------- ALTER TABLE [dbo].[yanan] ADD PRIMARY KEY ([id]) GO
项目结构展示：
第二部分：改造优化
上述方式能实现，但需要建实体类，影响开发和维护效率，下面改造成接口形式且无实体类方式：
为了便于区分（也便于我接下来的项目），把名称结构等做了修改
1,同上（项目名DeleteOrder）
2，cn.yanan.deleteorder.mapper下新建UserMapper接口
package cn.yanan.deleteorder.mapper; import java.util.List; import java.util.Map; public interface UserMapper { Map<String,Object> selectUser(int id); List<Map<String,Object>> selectUsers(); }
3，根目录下新建UserMapper.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="cn.yanan.deleteorder.mapper.UserMapper"> <select id="selectUser" parameterType="int" resultType="java.util.Map"> SELECT * FROM Yanan WHERE id = #{id} </select> <select id="selectUsers" resultType="java.util.Map"> SELECT * FROM Yanan </select> </mapper>
4，根目录下新建configuration.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> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"></transactionManager> <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="yanan" /> </dataSource> </environment> </environments> <mappers> <mapper resource="UserMapper.xml"/> </mappers> </configuration>
5，cn.yanan.deleteorder.controller包下新建测试文件
package cn.yanan.deleteorder.controller; import java.io.IOException; import java.io.Reader; import java.util.List; import java.util.Map; 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 cn.yanan.deleteorder.mapper.UserMapper; public class MainController { public static void main(String[] args) throws IOException { String resource = "configuration.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); SqlSession session = ssf.openSession(); try{ UserMapper mapper = session.getMapper(UserMapper.class); Map<String,Object> user = mapper.selectUser(1); List<Map<String,Object>> users = mapper.selectUsers(); System.out.println(user.get("ifullname")); System.out.println(user); System.out.println("--------------分隔线---------------"); for(int i=0; i<users.size(); i++) { System.out.println(users.get(i).get("ifullname")); } } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } } }
源码包下载：DeleteOrder.rar
建表语句：同上
项目结构展示：
第三部分：继续优化
经过第二部分的优化已经能满足大部分网友的需求了。但对于一些要将该项目导出可运行jar包的网友来说并不能很好地运行，摘自一位博客的说法：
“因为”…/ResourceJar.jar!/resource/….”并不是文件资源定位符的格式 (jar中资源有其专门的URL形式： jar:!/{entry} )”，详细论述@参考博客
所以我们使用如下的方式：
InputStream is=MainController.class.getResourceAsStream("/configuration.xml"); BufferedReader br=new BufferedReader(new InputStreamReader(is));
经过上述步骤你会发现在eclipse下能够正常运行，但jar包还不能加载到配置文件，我们继续进行改造
src同目录下建资源包，并把配置文件拖拽进去，结构如下（上述.getResourceAsStream("/configuration.xml")配置不变）
如此，eclipse中与jar包中都能加载到配置文件了。但此时你会发现新的异常，加载不到configuration中的mapper.xml文件
我们继续改造，打开configuration.xml进行配置
并将此二者拖拽到configuration.xml同目录下：
至此，大事告成！
此时博主已整合了大量项目业务，不便将源码包发给大家，思路有了，我也写的很清晰，读者自行整理吧
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