的MyBatis的XMLGregorianCalendar處理

Question

映射文件 employeeMapper.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.xxxx.sample.test.dao.TestDAO"> 
<select id="selectEmployee" parameterType="int" resultMap="com.viasat.sample.domain.CreateDate" > 
select createdate from employee where id = #{id} 
</select> 
</mapper> 

映射接口 TestDAO.java

public interface TestDAO { 
public com.viasat.sample.domain.CreateDate selectEmployee(int id); 
} 

POJO豆 CreateDate.java

public class CreateDate { 
private XMLGregorianCalendar createdate; 
public XMLGregorianCalendar getCreatedate() { 
return createdate; 
} 
public void setCreatedate(XMLGregorianCalendar createdate) { 
this.createdate = createdate; 
} 
} 

主要方法 MainClass。 java的

public class MainClass { 
public static void main(String[] args) { 
SqlSession session = sqlSessionFactory.openSession(); 
try { 
TestDAO tm = session.getMapper(TestDAO.class); 
Map emp = tm.selectEmployee(123); 
} catch (Exception e) { 
e.printStackTrace(); 
} 
finally { 
session.close(); 
} 
} 
} 

問題：從檢索到的日期值（CREATEDATE）不是映射/在CREATEDATE豆設置的XMLGregorianCalendar類型CREATEDATE。如果創建的數據類型是Date，它會正常工作。簡要說明DATE數據類型未在Mybatis的XMLGregorianCalendar類型中設置。

Answer 1

創建一個自定義處理程序：

import java.sql.CallableStatement; 
import java.sql.Date; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.util.GregorianCalendar; 
import javax.xml.datatype.DatatypeConfigurationException; 
import javax.xml.datatype.DatatypeFactory; 
import javax.xml.datatype.XMLGregorianCalendar; 
import org.apache.ibatis.type.JdbcType; 
import org.apache.ibatis.type.TypeHandler; 
public class CustomDateTypeHandler implements TypeHandler { 
@Override 
public void setParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) 
throws SQLException { 
if (null != parameter) { 
long time = ((XMLGregorianCalendar) parameter).toGregorianCalendar().getTimeInMillis(); 
Date date = new java.sql.Date(time); 
ps.setDate(i, date); 
} 
else { 
ps.setTimestamp(i, null); 
} 
} 
@Override 
public Object getResult(ResultSet rs, String columnName) throws SQLException { 
Date date = rs.getDate(columnName); 
if (null == date) { 
return null; 
} 
XMLGregorianCalendar date2 = null; 
GregorianCalendar c = new GregorianCalendar(); 
c.setTime(date); 
try { 
date2 = DatatypeFactory.newInstance().newXMLGregorianCalendar(c); 
} catch (DatatypeConfigurationException e) { 
e.printStackTrace(); 
} 
return date2; 
} 
@Override 
public Object getResult(CallableStatement cs, int columnIndex) throws SQLException { 
return ""; 
} 
} 

在MyBatis的XML配置文件添加該處理程序：

<typeHandler handler="com.viasat.cmdb.common.utils.CustomDateTypeHandler" javaType="javax.xml.datatype.XMLGregorianCalendar" /> 
</typeHandlers>