定时实现MySQL任务:借助Quartz(mysqlquartz)

MySQL是目前比较流行的关系型数据库,它可以用来存储和驱动复杂的应用程序。有时我们需要定时执行MySQL任务。借助Quartz,可以实现定时执行MySQL任务,以下是借助Quartz定时实现MySQL任务的基本步骤:

1、配置quartz.properties文件

首先,在quartz的应用工程class路径下添加quartz.properties文件,并将下面的内容添加到文件中。

org.quartz.scheduler.instanceName = MyQuartzScheduler
org.quartz.scheduler.instanceId = AUTO
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 5
org.quartz.jobStore.class=org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.driverDelegateClass= org.quartz.impl.jdbcjobstore.StdJDBCDelegate
org.quartz.jobStore. dataSource = myDataSource
org.quartz.jobStore. tablePrefix = QRTZ_
org.quartz.dataSource.myDataSource. connectionProvider.class = org.quartz.utils.PoolingConnectionProvider
org.quartz.dataSource.myDataSource. driver = com.mysql.jdbc.Driver
org.quartz.dataSource.myDataSource. URL = jdbc:mysql://localhost:3306/quartz
org.quartz.dataSource.myDataSource. user = root
org.quartz.dataSource.myDataSource. password = password
org.quartz.dataSource.myDataSource. maxConnections = 10

2、创建表

这些表将在MySQL中创建,然后用于存储调度信息:

“` mysql

CREATE TABLE QRTZ_JOB_DETAILS(

JOB_NAME VARCHAR(100) NOT NULL,

JOB_GROUP VARCHAR(100) NOT NULL,

DESCRIPTION VARCHAR(250) NULL,

JOB_CLASS_NAME VARCHAR(250) NOT NULL,

IS_DURABLE VARCHAR(1) NOT NULL,

IS_VOLATILE VARCHAR(1) NOT NULL,

IS_STATEFUL VARCHAR(1) NOT NULL,

REQUESTS_RECOVERY VARCHAR(1) NOT NULL,

PRIMARY KEY (JOB_NAME, JOB_GROUP)

);

CREATE TABLE QRTZ_TRIGGERS (

TRIGGER_NAME VARCHAR(150) NOT NULL,

TRIGGER_GROUP VARCHAR(150) NOT NULL,

JOB_NAME VARCHAR(150) NOT NULL,

JOB_GROUP VARCHAR(150) NOT NULL,

DESCRIPTION VARCHAR(250) NULL,

NEXT_FIRE_TIME BIGINT(13) NULL,

PREV_FIRE_TIME BIGINT(13) NULL,

PRIORITY INTEGER NULL,

TRIGGER_STATE VARCHAR(16) NOT NULL,

TRIGGER_TYPE VARCHAR(8) NOT NULL,

START_TIME BIGINT(13) NOT NULL,

END_TIME BIGINT(13) NULL,

CALENDAR_NAME VARCHAR NULL,

MISFIRE_INSTR VARCHAR(2) NULL,

JOB_DATA BLOB NULL,

PRIMARY KEY (TRIGGER_NAME, TRIGGER_GROUP),

FOREIGN KEY (JOB_NAME, JOB_GROUP)

REFERENCES QRTZ_JOB_DETAILS(JOB_NAME, JOB_GROUP)

);


3、编写MySQL任务
接下来,我们编写一个MySQL任务,用于定时执行MySQL命令:
```java
public class MyDatabaseJob implements Job {
public void execute(JobExecutionContext context) {
try {
// 连接MySQL数据库
Connection connection =
DriverManager.getConnection("jdbc:mysql://localhost:3306/quartz");

// 执行MySQL命令
Statement statement = connection.createStatement();
int rowCount = statement.executeUpdate("UPDATE myTable SET column = 'aValue'");
System.out.println(rowCount + " row(s) updated");
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}

}

4、编写jobs.xml文件

将MySQL任务与定时执行器关联起来:

“`xml

xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”

xsi:schemaLocation=”

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd”>


5、启动任务
最后,启动Spring容器,在每一分钟时,MySQL任务将被定时执行。
总而言之,借助Quartz可以方便地定时执行MySQL任务,大大节省了工作量。但是更重要的是,它提供了一种在后台长期运行的可靠方式,极大地提高了程序的效率与可靠性。

数据运维技术 » 定时实现MySQL任务:借助Quartz(mysqlquartz)