MySQL创建表答案_mysql系列教材（四）- 创建表

忘是亡心i 2022-10-28 12:29 194阅读 0赞

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

public class Test \{

List cs = new ArrayList();

int size;

public Test(int size) \{

this.size = size;

init();

public void init() \{

//这里恰恰不能使用try-with-resource的方式，因为这些连接都需要是"活"的，不要被自动关闭了

try \{

Class.forName("com.mysql.jdbc.Driver");

for (int i = 0; i < size; i++) \{

Connection c = DriverManager

.getConnection("jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8", "root", "admin");

cs.add(c);

\} catch (ClassNotFoundException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

\} catch (SQLException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

public synchronized Connection getConnection() \{

while (cs.isEmpty()) \{

try \{

this.wait();

\} catch (InterruptedException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

Connection c = cs.remove(0);

return c;

public synchronized void returnConnection(Connection c) \{

cs.add(c);

this.notifyAll();

public static void main(String\[\] args) \{

Thread thread=null;

long tic =System.currentTimeMillis();

List ts = new ArrayList<>();

for(int i=0;i<100;i++)

thread =new Thread()\{

public void run()\{

try \{

Class.forName("com.mysql.jdbc.Driver");

\} catch (ClassNotFoundException e) \{

e.printStackTrace();

try (

Connection c = DriverManager.getConnection

("jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8",

"root", "admin");//a mistake may happen because of the limit connection that

//Mysql can offer!

Statement s = c.createStatement();

)

String sql = "insert into hero values"

\+ "(null," + "'hero"+"'," + 313.0f + "," + 50 + ")";

s.execute(sql);

System.out.println("1 insert a data!");

\} catch (SQLException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

\};

thread.start();

ts.add(thread);

for(Thread t:ts)\{//Wait until the thread go to an end!!!

try\{

t.join();

\}catch(InterruptedException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

long toc=System.currentTimeMillis();

System.out.println("The traditional method has cost "+

(toc-tic)+" milliseconds!");

//\*\*\*\*\*\*\*\*\*\*\*\*\*

Test test=new Test(10);

test.init();

tic=System.currentTimeMillis();

List ts1 = new ArrayList<>();

for(int i=0;i<100;i++)

thread =new Thread()\{

public void run()

Connection c=test.getConnection();

String statement="insert into hero values"

\+ "(null," + "'hero"+"'," + 313.0f + "," + 50 + ")";

try(Statement st=c.createStatement())\{

st.execute(statement.toString());

System.out.println("2 insert a data!");

\}catch (SQLException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

test.returnConnection(c);

\};

thread.start();

ts1.add(thread);

for (Thread t : ts1) \{//Wait until the thread go to an end!!!

try \{

t.join();

\} catch (InterruptedException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

toc=System.currentTimeMillis();

System.out.println("The connection pool cost "+(toc-tic)+" milliseconds!");

/\*

Test cp = new Test(3);

for (int i = 0; i < 100; i++) \{

new WorkingThread("working thread" + i, cp).start();

\}\*/

class WorkingThread extends Thread \{

private Test cp;

public WorkingThread(String name, Test cp) \{

super(name);

this.cp = cp;

public void run() \{

Connection c = cp.getConnection();

System.out.println(this.getName()+ ":\\t 获取了一根连接，并开始工作" );

try (Statement st = c.createStatement())\{

//模拟时耗１秒的数据库ＳＱＬ语句

Thread.sleep(1000);

st.execute("select \* from hero");

\} catch (SQLException | InterruptedException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

cp.returnConnection(c);

MySQL创建表答案_mysql系列教材（四）- 创建表

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