Java代码
/*
*在项目中,遇到这样的一个问题,当某一模块需要插入,更新一批大的数据量时,
*此处大的含义是:更新到的数据记录比较多
*用ibatis实现一条一条的插入,更新,如此循环下去。速度很慢
*分析:
* 这些操作有个共同点:
* PreparedStatement对象和已映射的语句完全一致(简单点说:就是操作不断重复)
* 由于事物是交给spring管理了,所以每做一次操作都会起一个事物,久而久之导致
* 性能问题。
*
* batch批处理就适合那些查询,插入,更新,删除等大量重复的操作
*
* 存储过程也比较适合这样的场合,但要求很多
* 批处理 是把 所有sql语句 放入一块内存中,然后一次性全部写到服务器,这个节省了客* 服端到服务器的访问时间
*/
-- Create table
create or replace table DEMO
(
UUID NUMBER,
UUSER VARCHAR2(50),
UPASSWORD VARCHAR2(50)
)
--Insert a million records with the DEMO procedure
create or replace procedure demo_p(total in integer) AS
uuid number :=1;
uuser varchar2(50) := 'user';
upassword varchar2(50) :='password';
begin
loop
insert into demo(uuid,uuser,upassword) values(uuid,uuser||uuid,upassword||uuid);
uuid := uuid + 1;
exit when uuid >= total;
end loop;
end;
---Clear table then call procedure to insert a million records
truncate table demo;
call demo_p(1000);
select * from demo;
--Java实现
--1--ibatis普通实现插入一百条条数据--
--2--ibatis批量插入一百万条数据--
--3--ibatis调用存储过程插入一百万条数据--
1--构建环境 添加 classes12.jar ibatis-2.3.4.726.jar
2--写好ibatis基本配置文件,公共资源文件
SqlMapConfig.properties
Java代码
# DB Config
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:orcl
username=scott
password=tiger
SqlMapConfig.xml
Java代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig
PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN"
"http://www.ibatis.com/dtd/sql-map-config-2.dtd">
<!-- Always ensure to use the correct XML header as above! -->
<sqlMapConfig>
<properties resource = "com/oyp/sqlmap/SqlMapConfig.properties" />
<settings cacheModelsEnabled="true" enhancementEnabled="true"
lazyLoadingEnabled="true" maxRequests="32" maxSessions="10"
maxTransactions="5" useStatementNamespaces="false" />
<transactionManager type = "JDBC">
<dataSource type = "SIMPLE">
<property name="JDBC.Driver" value="${driver}" />
<property name="JDBC.ConnectionURL" value="${url}" />
<property name="JDBC.Username" value="${username}" />
<property name="JDBC.Password" value="${password}" />
</dataSource>
</transactionManager>
<sqlMap resource = "com/oyp/sqlmap/User.xml"/>
</sqlMapConfig>
3--dto层,或者说是model层
User.java
Java代码
package com.oyp.model;
import java.io.Serializable;
/**
* @author oyp 2009-12-14
*/
public class User implements Serializable {
private static final long serialVersionUID = 2804032598967813289L;
private int id;
private String name;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
4--sqlmap映射文件
Java代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap
PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN"
"http://www.ibatis.com/dtd/sql-map-2.dtd">
<sqlMap namespace = "user" >
<typeAlias alias = "user" type = "com.oyp.model.User"/>
<insert id = "insert_user" parameterClass = "user" >
INSERT INTO DEMO (UUID, UUSER, UPASSWORD) VALUES ( #id#,#name#, #password# )
</insert>
<update id = "clear_user" >
truncate table demo
</update>
<parameterMap id="oypmap" class="java.util.Map">
<parameter property="total" javaType="int" jdbcType="INTEGER" mode="IN" />
</parameterMap>
<procedure id="procedureoyp" parameterMap="oypmap" >
{ call demo_p(?) }
</procedure>
</sqlMap>
5--DAO层
Java代码
package com.oyp.dao;
import java.sql.SQLException;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.oyp.model.User;
public class UserDAO {
public static SqlMapClient sqlMap = AppSqlConfig.getSqlMap();
public static void insertUser(User user) throws SQLException {
sqlMap.insert("insert_user",user);
}
public static void clearTable() {
try {
sqlMap.update("clear_user");
}catch (SQLException e) {
e.printStackTrace();
}
}
}
5--获取封装数据库信息的Ibatis对象
Java代码
package com.oyp.dao;
import java.io.IOException;
import java.io.Reader;
import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
public class AppSqlConfig {
private static final SqlMapClient sqlMap;
static {
try {
Reader reader = Resources.getResourceAsReader("com/oyp/sqlmap/SqlMapConfig.xml");
sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);
reader.close();
} catch (IOException e) {
// Fail fast.
throw new RuntimeException("Something bad happened while building the SqlMapClient instance." + e, e);
}
}
public static SqlMapClient getSqlMap() {
return sqlMap;
}
}
大公告成,等着测试下
休息................
开始测试
Java代码
/**
* 描述:一般处理
* @author oyp 2009-12-15
*/
public class Main {
public static int number =Util.number;
public static void main (String[] args) throws SQLException {
//清空表
UserDAO.clearTable();
//一般处理
List<User> list = new ArrayList<User>();
for (int i = 0 ; i < number; i++) {
User tempuser = new User();
tempuser.setId(i);
tempuser.setName("user"+i);
tempuser.setPassword("password"+i);
list.add(tempuser);
}
//开始
UserDAO.sqlMap.startTransaction();
long begin = System.currentTimeMillis();
for (int i = 0 ; i < number ; i++) {
try {
UserDAO.insertUser(list.get(i));
} catch (SQLException e) {
e.printStackTrace();
}
}
UserDAO.sqlMap.commitTransaction();
UserDAO.sqlMap.endTransaction();
System.out.println(System.currentTimeMillis()-begin);
}
}
/**
* 描述:batch处理
* @author oyp 2009-12-15
*/
public class MainBatch {
public static int number =Util.number;
public static void main (String[] args) throws SQLException {
//清空表
UserDAO.clearTable();
//批量插入的对象
List<User> list = new ArrayList<User>();
for (int i = 0 ; i < number; i++) {
User tempuser = new User();
tempuser.setId(i);
tempuser.setName("user"+i);
tempuser.setPassword("password"+i);
list.add(tempuser);
}
//批量处理开始
long begin = System.currentTimeMillis();
UserDAO.sqlMap.startTransaction();
for (int i = 0 ; i < number ; i ++) {
if (i % 10000 == 0) {
UserDAO.sqlMap.startBatch();
}
UserDAO.insertUser(list.get(i));
if ((i+1) % 10000 ==0) {
UserDAO.sqlMap.executeBatch();
}
}
UserDAO.sqlMap.executeBatch();
UserDAO.sqlMap.commitTransaction();
UserDAO.sqlMap.endTransaction();
System.out.println(System.currentTimeMillis()-begin);
}
}
/*
*描述:调用存储过程
*@author oyp 2009-12-15
*/
public class MainProcedure {
public static int number =Util.number;
public static void main (String[] args) throws SQLException {
//清空表
UserDAO.clearTable();
HashMap map = new HashMap();
map.put("total", number);
//调用存储过程
long begin = System.currentTimeMillis();
UserDAO.sqlMap.startTransaction();
UserDAO.sqlMap.insert("procedureoyp",map);
UserDAO.sqlMap.commitTransaction();
UserDAO.sqlMap.endTransaction();
System.out.println(System.currentTimeMillis()-begin);
}
}
Java代码
1-- Util.number = 1000 ;
普通处理:593ms
批量处理:94ms
存储过程处理:218ms
2--Util.number = 10000;
普通处理:2734ms
批量处理:328ms
存储过程处理:1172ms
3--Util.number = 100000;
普通处理: 32641 ms 休息....
批量处理: 1937ms 休息....
存储过程处理:8453 ms
4--Util.number = 300000;
批量处理: 3937 ms 休息....
5--Util.number = 1000000;
批量处理: 电脑被我折腾着不行了
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2760)
at java.util.Arrays.copyOf(Arrays.java:2734)
at java.util.ArrayList.ensureCapacity(ArrayList.java:167)
at java.util.ArrayList.add(ArrayList.java:351)
at MainBatch.main(MainBatch.java:24)
(注:因为要创建插入数据库的对象所以内存耗尽, 公司配的电脑太差!)
存储过程: 119906 ms
这些纯属菜鸟级的试验,真正的项目当中要考虑到各方面的原因,要比这复杂多了,所以哪里需要改善,或者有什么好的建议,尽管砸吧!~~(事务,数据库)
ps: 这种情况,存储过程的效率怎么比不上批处理 ??