标签：object map exce public ltm rate for span resultmap
全局配置：
<typeHandlers> <typeHandler handler="com.gong.mybatis.typeHandler.MyEnumEmpStatusTypeHandler" javaType="com.gong.mybatis.bean.EmpStatus"/> <!-- <typeHandler handler="org.apache.ibatis.type.EnumOrdinalTypeHandler" javaType="com.gong.mybatis.bean.EmpStatus"/> --> </typeHandlers>
MyEnumEmpStatusTypeHandler.java
package com.gong.mybatis.typeHandler; import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import org.apache.ibatis.type.JdbcType; import org.apache.ibatis.type.TypeHandler; import com.gong.mybatis.bean.EmpStatus; /** * 1、实现TypeHandler接口。或者继承BaseTypeHandler * * */ public class MyEnumEmpStatusTypeHandler implements TypeHandler<EmpStatus> { /** * 定义当前数据如何保存到数据库中 */ @Override public void setParameter(PreparedStatement ps, int i, EmpStatus parameter, JdbcType jdbcType) throws SQLException { // TODO Auto-generated method stub System.out.println("要保存的状态码："+parameter.getCode()); ps.setString(i, parameter.getCode().toString()); } @Override public EmpStatus getResult(ResultSet rs, String columnName) throws SQLException { // TODO Auto-generated method stub //需要根据从数据库中拿到的枚举的状态码返回一个枚举对象 int code = rs.getInt(columnName); System.out.println("从数据库中获取的状态码："+code); EmpStatus status = EmpStatus.getEmpStatusByCode(code); return status; } @Override public EmpStatus getResult(ResultSet rs, int columnIndex) throws SQLException { // TODO Auto-generated method stub int code = rs.getInt(columnIndex); System.out.println("从数据库中获取的状态码："+code); EmpStatus status = EmpStatus.getEmpStatusByCode(code); return status; } @Override public EmpStatus getResult(CallableStatement cs, int columnIndex) throws SQLException { // TODO Auto-generated method stub int code = cs.getInt(columnIndex); System.out.println("从数据库中获取的状态码："+code); EmpStatus status = EmpStatus.getEmpStatusByCode(code); return status; } }
EmpSatus.java
package com.gong.mybatis.bean; public enum EmpStatus { LOGIN(100,"用户登录"),LOGOUT(200,"用户登出"),REMOVE(300,"用户不存在"); private Integer code; private String msg; private EmpStatus(Integer code,String msg) { this.code = code; this.msg = msg; } public Integer getCode() { return code; } public void setCode(Integer code) { this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public static EmpStatus getEmpStatusByCode(int code) { // TODO Auto-generated method stub switch(code){ case 100: return LOGIN; case 200: return LOGOUT; case 300: return REMOVE; default: return LOGOUT; } } }
Employee.java
private Integer id; private String lastName; private String gender; private String email; private EmpStatus empStatus=EmpStatus.LOGOUT; Department dept;
测试：
package com.gong.mybatis.test; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; 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 org.junit.Test; import com.github.pagehelper.Page; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.gong.mybatis.bean.Department; import com.gong.mybatis.bean.Employee; import com.gong.mybatis.dao.EmployeeMapper; import com.gong.mybatis.mapper.EmployeeMapperDynamicSql; public class TestMybatis5 { public SqlSessionFactory getSqlSessionFactory() throws IOException { String resource = "mybatis-config.xml"; InputStream is = Resources.getResourceAsStream(resource); return new SqlSessionFactoryBuilder().build(is); } @Test public void test() throws IOException { SqlSessionFactory sqlSessionFactory = getSqlSessionFactory(); SqlSession openSession = sqlSessionFactory.openSession(); try { EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class); //第一个参数为当前页码，第二个参数是每页的记录数 Page<Object> page = PageHelper.startPage(1,2); List<Employee> emps = mapper.getAllEmp(); //第一个参数为传入的数据，第二个参数为连续显示多少页 PageInfo<Employee> pageInfo = new PageInfo<>(emps,3); for(Employee emp:emps) { System.out.println(emp); } // System.out.println("当前页码："+page.getPageNum()); // System.out.println("总记录数："+page.getTotal()); // System.out.println("每页几条记录："+page.getPageSize()); // System.out.println("总页码数："+page.getPages()); System.out.println("当前页码："+pageInfo.getPageNum()); System.out.println("总记录数："+pageInfo.getTotal()); System.out.println("每页几条记录："+pageInfo.getPageSize()); System.out.println("总页码数："+pageInfo.getPages()); System.out.println("是否第一页："+pageInfo.isIsFirstPage()); System.out.println("是否最后一页："+pageInfo.isIsLastPage()); System.out.println("连续显示的页码："); int[] navigatepageNums = pageInfo.getNavigatepageNums(); for (int i = 0; i < navigatepageNums.length; i++) { System.out.println(navigatepageNums[i]); } } finally { // TODO: handle finally clause openSession.close(); } } @Test public void testEnum() throws IOException { SqlSessionFactory sqlSessionFactory = getSqlSessionFactory(); SqlSession openSession = sqlSessionFactory.openSession(); try { EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class); Employee employee = new Employee(); employee.setLastName("bom"); employee.setGender("1"); employee.setEmail("bom@qq.com"); mapper.addEmp(employee); System.out.println("保存成功："+employee.getId()); openSession.commit(); } finally { // TODO: handle finally clause openSession.close(); } } }
结果：
DEBUG 01-23 16:02:56,976 ==> Preparing: insert into tbl_employee(last_name,gender,email,empStatus) values(?,?,?,?) (BaseJdbcLogger.java:145) 要保存的状态码：200 DEBUG 01-23 16:02:57,030 ==> Parameters: bom(String), 1(String), bom@qq.com(String), 200(String) (BaseJdbcLogger.java:145) DEBUG 01-23 16:02:57,046 <== Updates: 1 (BaseJdbcLogger.java:145) 保存成功：11
数据库中：
存储的是自己定义的枚举类型中的code。
再进行查询：
Employee employee = mapper.getEmpById(11);
System.out.println(employee);
System.out.println(employee.getEmpstatus());
openSession.commit();
输出：
DEBUG 01-23 16:11:09,121 ==> Preparing: select id,last_name lastName,email,gender,empStatus from tbl_employee where id = ? (BaseJdbcLogger.java:145) DEBUG 01-23 16:11:09,180 ==> Parameters: 11(Integer) (BaseJdbcLogger.java:145) 从数据库中获取的状态码：200 DEBUG 01-23 16:11:09,237 <== Total: 1 (BaseJdbcLogger.java:145) Employee [id=11, lastName=bom, gender=1, email=bom@qq.com, dept=null] LOGOUT
说明确实是定义成功的。
同时，
<!--2、也可以在处理某个字段的时候告诉MyBatis用什么类型处理器 保存：#{empStatus,typeHandler=xxxx} 查询： <resultMap type="com.atguigu.mybatis.bean.Employee" id="MyEmp"> <id column="id" property="id"/> <result column="empStatus" property="empStatus" typeHandler=""/> </resultMap> 注意：如果在参数位置修改TypeHandler，应该保证保存数据和查询数据用的TypeHandler是一样的。 -->
标签：object map exce public ltm rate for span resultmap
原文地址：https://www.cnblogs.com/xiximayou/p/12230771.html
