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 = AUTOorg.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 5org.quartz.jobStore.class=org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.driverDelegateClass= org.quartz.impl.jdbcjobstore.StdJDBCDelegateorg.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.Driverorg.quartz.dataSource.myDataSource. URL = jdbc:mysql://localhost:3306/quartz
org.quartz.dataSource.myDataSource. user = rootorg.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:
```javapublic 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。