select * from tj23 where vin='"+rand.nextInt(1000000)+"' order by inday desc limit 10

50并发：
Thread[Thread-28,5,main]===>Mon Nov 08 14:24:50 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-26
Thread[Thread-28,5,main]===>Mon Nov 08 14:24:50 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-25
Thread[Thread-28,5,main]===>Mon Nov 08 14:24:50 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-24
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-08-02
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-08-01
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-31
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-30
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-29
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-28
Thread[Thread-14,5,main]===>Mon Nov 08 14:24:51 CST 2021-----Mon Nov 08 14:24:52 CST 2021----2024-07-27
100并发：
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-08-02
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-08-01
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-31
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-30
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-29
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-28
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-27
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-26
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-25
Thread[Thread-1,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:42 CST 2021----2024-07-24
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-08-02
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-08-01
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-31
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-30
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-29
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-28
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-27
Thread[Thread-7,5,main]===>Mon Nov 08 14:26:41 CST 2021-----Mon Nov 08 14:26:43 CST 2021----2024-07-26

 

100并发会报资源不足的错误：

java.sql.SQLSyntaxErrorException: Reach limit of connections
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at org.doris.Yace7$Com.<init>(Yace7.java:41)
    at org.doris.Yace7.main(Yace7.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:66)
java.lang.NullPointerException
    at org.doris.Yace7$Com.run(Yace7.java:99)
    at java.lang.Thread.run(Thread.java:748)
Exception in thread "Thread-96" java.lang.NullPointerException
    at org.doris.Yace7$Com.run(Yace7.java:109)
    at java.lang.Thread.run(Thread.java:748)
java.sql.SQLSyntaxErrorException: Reach limit of connections
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at org.doris.Yace7$Com.<init>(Yace7.java:41)
    at org.doris.Yace7.main(Yace7.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:66)
java.lang.NullPointerException
    at org.doris.Yace7$Com.run(Yace7.java:99)
    at java.lang.Thread.run(Thread.java:748)
Exception in thread "Thread-97" java.lang.NullPointerException
    at org.doris.Yace7$Com.run(Yace7.java:109)
    at java.lang.Thread.run(Thread.java:748)