请教如何进行多线程连接数据库并写入数据

#include <QCoreApplication>

#include "thread.h"

#include <QVector>

#include <QDebug>

int main(int argc, char *argv[])

{

QCoreApplication a(argc, argv)

QVector<Thread*>vector

Thread *thread

//创建多个线程，并start

for(int i=0i<10i++){

thread=new Thread

vector.append(thread)

thread->set(i)

thread->start()

}

//等待所有线程执行完，然后删除线程

foreach(thread,vector){

thread->wait()

}

foreach(thread,vector){

delete thread

}

return a.exec()

}

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#include "thread.h"

Thread::Thread(QObject *parent) : QThread(parent)

{

}

void Thread::run()

{

begin()

}

//为每个线程创建一个连接名

void Thread::set(int a)

{

connectionName=QString::number(a)

}

void Thread::connectionDatabase(QString dbName)

{

QSqlDatabasedb=QSqlDatabase::addDatabase("QMYSQL",connectionName)

db.setHostName("localhost")

db.setDatabaseName(dbName)

db.setUserName("root")

db.setPassword("")

if(!db.open())

qDebug()<<"db open fail"

}

void Thread::begin()

{

QString dbName="learnsql"

connectionDatabase(dbName)

QSqlDatabase db=QSqlDatabase::database(connectionName)

db.transaction()//开启事物

QSqlQuery query(db)

//向表student中插入10000条数据

for(int i=1i<=10000i++){

query.exec("insert into student values(1)")

}

db.commit()//提交事物

}

连接数据库要连接池，就是connection对象要放在一个LinkedList里面，然后每个线程一个。这个这个List被封装在一个单例模式的对象里。线程要是共享connection，要是搞起并发来，一下子就挂了。

//将数据库中的数据条数分段

public void division(){

//获取要导入的总的数据条数

String sql3="SELECT count(*) FROM [CMD].[dbo].[mycopy1]"

try {

pss=cons.prepareStatement(sql3)

rss=pss.executeQuery()

while(rss.next()){

System.out.println("总记录条数:"+rss.getInt(1))

sum=rss.getInt(1)

}

//每30000条记录作为一个分割点

if(sum>=30000){

n=sum/30000

residue=sum%30000

}else{

residue=sum

}

System.out.println(n+" "+residue)

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

线程类

public MyThread(int start,int end) {

this.end=end

this.start=start

System.out.println("处理掉余数")

try {

System.out.println("--------"+Thread.currentThread().getName()+"------------")

Class.forName(SQLSERVERDRIVER)

System.out.println("加载sqlserver驱动...")

cons = DriverManager.getConnection(CONTENTS,UNS,UPS)

stas = cons.createStatement()

System.out.println("连接SQLServer数据库成功！！")

System.out.println("加载mysql驱动.....")

Class.forName(MYSQLDRIVER)

con = DriverManager.getConnection(CONTENT,UN,UP)

sta = con.createStatement()

// 关闭事务自动提交

con.setAutoCommit(false)

System.out.println("连接mysql数据库成功！！")

} catch (Exception e) {

e.printStackTrace()

}

// TODO Auto-generated constructor stub

}

public ArrayList<Member>getAll(){

Member member

String sql1="select * from (select row_number() over (order by pmcode) as rowNum,*" +

" from [CMD].[dbo].[mycopy1]) as t where rowNum between "+start+" and "+end

try {

System.out.println("正在获取数据...")

allmembers=new ArrayList()

rss=stas.executeQuery(sql1)

while(rss.next()){

member=new Member()

member.setAddress1(rss.getString("address1"))

member.setBnpoints(rss.getString("bnpoints"))

member.setDbno(rss.getString("dbno"))

member.setExpiry(rss.getString("expiry"))

member.setHispoints(rss.getString("hispoints"))

member.setKypoints(rss.getString("kypoints"))

member.setLevels(rss.getString("levels"))

member.setNames(rss.getString("names"))

member.setPmcode(rss.getString("pmcode"))

member.setRemark(rss.getString("remark"))

member.setSex(rss.getString("sex"))

member.setTelephone(rss.getString("telephone"))

member.setWxno(rss.getString("wxno"))

member.setPmdate(rss.getString("pmdate"))

allmembers.add(member)

// System.out.println(member.getNames())

}

System.out.println("成功获取sqlserver数据库数据！")

return allmembers

} catch (SQLException e) {

// TODO Auto-generated catch block

System.out.println("获取sqlserver数据库数据发送异常！")

e.printStackTrace()

}

try {

rss.close()

stas.close()

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

return null

}

public void inputAll(ArrayList<Member>allmembers){

System.out.println("开始向mysql中写入")

String sql2="insert into test.mycopy2 values (?,?,?,?,?,?,?,?,?,?,?,?,?,?)"

try {

ps=con.prepareStatement(sql2)

System.out.println("-------------------------等待写入数据条数: "+allmembers.size())

for(int i=0i<allmembers.size()i++){

ps.setString(1, allmembers.get(i).getPmcode())

ps.setString(2, allmembers.get(i).getNames())

//System.out.println(allmembers.get(i).getNames())

ps.setString(3, allmembers.get(i).getSex())

ps.setString(4, allmembers.get(i).getTelephone())

ps.setString(5, allmembers.get(i).getAddress1())

ps.setString(6, allmembers.get(i).getPmdate())

ps.setString(7, allmembers.get(i).getExpiry())

ps.setString(8, allmembers.get(i).getLevels())

ps.setString(9, allmembers.get(i).getDbno())

ps.setString(10, allmembers.get(i).getHispoints())

ps.setString(11, allmembers.get(i).getBnpoints())

ps.setString(12, allmembers.get(i).getKypoints())

ps.setString(13, allmembers.get(i).getWxno())

ps.setString(14, allmembers.get(i).getRemark())

//插入命令列表

//ps.addBatch()

ps.executeUpdate()

}

//ps.executeBatch()

con.commit()

ps.close()

con.close()

this.flag=false

System.out.println(Thread.currentThread().getName()+"--->OK")

} catch (SQLException e) {

// TODO Auto-generated catch block

System.out.println("向mysql中更新数据时发生异常！")

e.printStackTrace()

}

}

@Override

public void run() {

// TODO Auto-generated method stub

while(true&&flag){

this.inputAll(getAll())

}

}

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