Statement.setQueryTimeout(seconds)在家中环境的再次试验 证明此语句还是有效的

对比实验：https://www.cnblogs.com/xiandedanteng/p/11955887.html

这次实验的环境是T440p上安装的Windows版Oracle11g，版本为：

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

用于实验造成行锁的程序：

package com.hy.multidelete;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.log4j.Logger;

public class Deleter {
    private static Logger log = Logger.getLogger(Deleter.class);
    
    public void doDelete() {
        Connection conn = null;
        Statement stmt = null;
        
        try{
            Class.forName(DBParam.Driver).newInstance();
            conn = DriverManager.getConnection(DBParam.DbUrl, DBParam.User, DBParam.Pswd);
            conn.setAutoCommit(false);
            stmt = conn.createStatement();
            
            String sql="delete from TestTB17 where id=1";
            int deleted=stmt.executeUpdate(sql);
            
            // 在此处停住断点，另一个删除程序CleanExpiredMocker会执行不下去
            log.info("Deleter deleted "+deleted+" records.");
            
            // 直到接下来回滚或提交CleanExpiredMocker才可以执行
            conn.rollback();
            log.info("Rollbacked.");
        } catch (Exception e) {
            System.out.print(e.getMessage());
        } finally {
            try {
                stmt.close();
                conn.close();
            } catch (SQLException e) {
                System.out.print("Can't close stmt/conn because of " + e.getMessage());
            }
        }
    }
    
    public static void main(String[] args) {
        Deleter d=new Deleter();
        d.doDelete();
    }
}

设置了执行sql超时的程序：

package com.hy.multidelete;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.log4j.Logger;

public class CleanExpiredMocker {
    private static Logger log = Logger.getLogger(CleanExpiredMocker.class);
    
    public void doClean() {
        Connection conn = null;
        Statement stmt = null;
        
        try{
            Class.forName(DBParam.Driver).newInstance();
            conn = DriverManager.getConnection(DBParam.DbUrl, DBParam.User, DBParam.Pswd);
            stmt = conn.createStatement();
            stmt.setQueryTimeout(2);
            
            String sql="delete from TestTB17 where id<250";
            int deleted=stmt.executeUpdate(sql);
            log.info("CleanExpiredMocker deleted "+deleted+" records.");;    
        } catch (Exception e) {
            System.out.print(e.getMessage());
            e.printStackTrace();
        } finally {
            try {
                stmt.close();
                conn.close();
            } catch (SQLException e) {
                System.out.print("Can't close stmt/conn because of " + e.getMessage());
            }
        }
    }
    
    public static void main(String[] args) {
        CleanExpiredMocker c=new CleanExpiredMocker();
        c.doClean();
    }
}

执行后，很快就终止了执行，输出如下：

ORA-01013: 用户请求取消当前的操作
java.sql.SQLException: ORA-01013: 用户请求取消当前的操作

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
    at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:194)
    at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:1000)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
    at oracle.jdbc.driver.OracleStatement.executeUpdateInternal(OracleStatement.java:1814)
    at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:1779)
    at oracle.jdbc.driver.OracleStatementWrapper.executeUpdate(OracleStatementWrapper.java:277)
    at com.hy.multidelete.CleanExpiredMocker.doClean(CleanExpiredMocker.java:24)
    at com.hy.multidelete.CleanExpiredMocker.main(CleanExpiredMocker.java:41)

程序，有时候真是跑起来才知道结果。

--END-- 2019年11月29日21:11:10