java中如何用多线程访问数据库

java中如何用多线程访问数据库,第1张

//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()) } }

//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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原文地址: http://outofmemory.cn/sjk/6684475.html

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