guzz的批量增加的功能

針對guzz的表分切與批量增加的應用

guzz的表切分功能，數據庫表是需要提前建好的。

guzz對於單個記錄的插入操作可以在插入之前設置 tableConditon.

例如：

WriteTranSession  session=trm.openRWTran(true);		
		int userNo=1;
		int courseNo=2;

		try{

			for(int i=0,j=100;i<j;i++)
			{
				userNo=i%4+1;
				courseNo=courseNo%8+1;

				Study study=new Study( userNo,  courseNo);

				Guzz.setTableCondition(study.getUserNo()) ;

				session.insert(study) ;

                                System.out.println(study.getNo());//可以得到記錄號
			}

		}finally{
			session.close();
		}

對於批量插入操作時不可以在每次insert的前一步設置 tableConditon.，

例如：

WriteTranSession  session=trm.openRWTran(false);

		int userNo=1;
		int courseNo=2;

		try{			
			ObjectBatcher batcher =session.createObjectBatcher();			
			Study study=new Study( userNo,  courseNo);
			for(int i=0,j=100;i<j;i++)
			{
				userNo=i%4+1;
				courseNo=courseNo%8+1;				
				study=new Study( userNo,  courseNo);				
				batcher.setTableCondition(study.getUserNo());//這裏會報錯的
				batcher.insert(study) ;
				System.out.println(study.getNo());
			}

			batcher.executeBatch();
			session.commit();		
		}finally{
			session.close();
		}

我們可以改變成分批的批量處理的結果是：

		WriteTranSession  session=trm.openRWTran(false);		
		int userNo=1;
		int courseNo=2;		
		try{

			ObjectBatcher batcher1 =session.createObjectBatcher();
			ObjectBatcher batcher2 =session.createObjectBatcher();
			ObjectBatcher batcher3 =session.createObjectBatcher();
			ObjectBatcher batcher4 =session.createObjectBatcher();

			batcher1.setTableCondition(1);
			batcher2.setTableCondition(2);
			batcher3.setTableCondition(3);
			batcher4.setTableCondition(4);

			Study study=null;

			for(int i=0,j=100;i<j;i++)
			{
				userNo=i%4+1;
				courseNo=courseNo%8+1;				
				study=new Study( userNo,  courseNo);				
				//batcher.setTableCondition(study.getUserNo());
				switch(userNo)
				{
				case 1:
					batcher1.insert(study);
					break;
				case 2:
					batcher2.insert(study);
					break;
				case 3:
					batcher3.insert(study);
					break;
				case 4 :
					batcher4.insert(study);
					break;
				}

			}

			int s1[]=batcher1.executeBatch();
			int s2[]=batcher2.executeBatch();
			int s3[]=batcher3.executeBatch();
			int s4[]=batcher4.executeBatch(); 
			//s1、s2、s3、s4的元素值都是1
			session.commit();		
		}finally{
			session.close();
		}

附錄：
配置文件：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE guzz-mapping PUBLIC "-//GUZZ//GUZZ MAPPING DTD//EN" "http://www.guzz.org/dtd/guzz-mapping.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.uidd.messageBoard.pojo.Study" table="t_study_" shadow="com.sjdd.messageBoard.pojo.StudyShadouView">
        <id name="no" type="int">
            <generator class="identity" />
        </id>
        <property name="userNo" type="int" column="userNo" />
        <property name="courseNo" type="int" column="courseNo" />
    </class>
</hibernate-mapping>

分表的規則

package com.uidd.messageBoard.pojo;

import org.guzz.exception.GuzzException;
import org.guzz.orm.AbstractShadowTableView;

public class StudyShadouView extends AbstractShadowTableView {

	public String toTableName(Object tableCondition) {
		// TODO Auto-generated method stub
		 if(tableCondition == null){ //強制要求必須設置表分切條件，避免編程時疏忽。
	             throw new GuzzException("null table conditon is not allowed.") ;
	     }

	     int userNo = (Integer) tableCondition ;

	     //如果用戶ID爲偶數，記入TB_COMMENT1, 否則寫入TB_COMMENT2
	     int i = userNo % 3 + 1 ;

	     return super.getConfiguredTableName() + i;

	}

}

創建表的SQL

create table t_study_1
(
  no INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
  userNo INT NOT NULL,
  courseNo int NOT NULL
);
create table t_study_2
(
  no INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
  userNo INT NOT NULL,
  courseNo int NOT NULL
);
create table t_study_3
(
  no INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
  userNo INT NOT NULL,
  courseNo int NOT NULL
);

package com.uidd.messageBoard.pojo;

public class Study implements java.io.Serializable {

	private int no;
	private int userNo;
	private int courseNo;
	public int getNo() {
		return no;
	}
	public void setNo(int no) {
		this.no = no;
	}
	public int getUserNo() {
		return userNo;
	}
	public void setUserNo(int userNo) {
		this.userNo = userNo;
	}
	public int getCourseNo() {
		return courseNo;
	}
	public void setCourseNo(int courseNo) {
		this.courseNo = courseNo;
	}
	public Study() {
		super();
		// TODO Auto-generated constructor stub
	}
	public Study(int no, int userNo, int courseNo) {
		super();
		this.no = no;
		this.userNo = userNo;
		this.courseNo = courseNo;
	}

	public Study(int userNo, int courseNo) {
		super();
		this.userNo = userNo;
		this.courseNo = courseNo;
	}

}