Quartz Data Source: A Complete Guide for MySQL

![Quartz](

Introduction

In the world of enterprise applications, scheduling jobs is a common requirement. Quartz is a powerful open-source job scheduling framework that provides a convenient way to schedule jobs in Java applications. Quartz supports various data sources to store job information, and one of the popular choices is MySQL. In this article, we will explore how to use Quartz with a MySQL database as the data source.

Quartz Data Source Configuration

To use Quartz with MySQL, we need to configure a MySQL data source in the Quartz configuration. The configuration file, usually named quartz.properties, should be placed in the classpath of your application. Let's take a look at a sample configuration:

org.quartz.dataSource.myDS.driver = com.mysql.jdbc.Driver
org.quartz.dataSource.myDS.URL = jdbc:mysql://localhost:3306/my_database
org.quartz.dataSource.myDS.user = my_user
org.quartz.dataSource.myDS.password = my_password
org.quartz.dataSource.myDS.maxConnections = 10

In this example, we configure a data source named myDS with the MySQL driver, URL, and credentials. The maxConnections property specifies the maximum number of connections in the connection pool.

Creating Quartz Tables in MySQL

Before we can use Quartz with MySQL, we need to create the necessary tables in the database. Quartz provides a script named tables_mysql.sql that can be found in the Quartz distribution. Execute this script in your MySQL database to create the required tables.

CREATE TABLE QRTZ_JOB_DETAILS (
  SCHED_NAME VARCHAR(120) NOT NULL,
  JOB_NAME VARCHAR(200) NOT NULL,
  JOB_GROUP VARCHAR(200) NOT NULL,
  DESCRIPTION VARCHAR(250) NULL,
  JOB_CLASS_NAME VARCHAR(250) NOT NULL,
  IS_DURABLE BOOLEAN NOT NULL,
  IS_NONCONCURRENT BOOLEAN NOT NULL,
  IS_UPDATE_DATA BOOLEAN NOT NULL,
  REQUESTS_RECOVERY BOOLEAN NOT NULL,
  JOB_DATA BLOB NULL,
  PRIMARY KEY (SCHED_NAME, JOB_NAME, JOB_GROUP)
);

CREATE TABLE QRTZ_TRIGGERS (
  SCHED_NAME VARCHAR(120) NOT NULL,
  TRIGGER_NAME VARCHAR(200) NOT NULL,
  TRIGGER_GROUP VARCHAR(200) NOT NULL,
  JOB_NAME VARCHAR(200) NOT NULL,
  JOB_GROUP VARCHAR(200) 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(200) NULL,
  MISFIRE_INSTR SMALLINT(2) NULL,
  JOB_DATA BLOB NULL,
  PRIMARY KEY (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP),
  FOREIGN KEY (SCHED_NAME, JOB_NAME, JOB_GROUP)
    REFERENCES QRTZ_JOB_DETAILS(SCHED_NAME, JOB_NAME, JOB_GROUP)
);

CREATE TABLE QRTZ_SIMPLE_TRIGGERS (
  SCHED_NAME VARCHAR(120) NOT NULL,
  TRIGGER_NAME VARCHAR(200) NOT NULL,
  TRIGGER_GROUP VARCHAR(200) NOT NULL,
  REPEAT_COUNT BIGINT(7) NOT NULL,
  REPEAT_INTERVAL BIGINT(12) NOT NULL,
  TIMES_TRIGGERED BIGINT(10) NOT NULL,
  PRIMARY KEY (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP),
  FOREIGN KEY (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP)
    REFERENCES QRTZ_TRIGGERS(SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP)
);

CREATE TABLE QRTZ_CRON_TRIGGERS (
  SCHED_NAME VARCHAR(120) NOT NULL,
  TRIGGER_NAME VARCHAR(200) NOT NULL,
  TRIGGER_GROUP VARCHAR(200) NOT NULL,
  CRON_EXPRESSION VARCHAR(200) NOT NULL,
  TIME_ZONE_ID VARCHAR(80),
  PRIMARY KEY (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP),
  FOREIGN KEY (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP)
    REFERENCES QRTZ_TRIGGERS(SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP)
);

CREATE TABLE QRTZ_SIMPROP_TRIGGERS (
  SCHED_NAME VARCHAR(120) NOT NULL,
  TRIGGER_NAME VARCHAR(200) NOT NULL,
  TRIGGER_GROUP VARCHAR(200) NOT NULL,
  STR_PROP_1 VARCHAR(512) NULL,
  STR_PROP_2 VARCHAR(512) NULL,
  STR_PROP_3 VARCHAR(512) NULL,
  INT_PROP_1 INT NULL,
  INT_PROP_2 INT NULL,
  LONG_PROP_1 BIGINT NULL,
  LONG_PROP_2 BIGINT NULL,
  DEC_PROP_1 NUMERIC(13,4) NULL,
  DEC_PROP_2 NUMERIC(13,4) NULL,
  BOOL_PROP_1 VARCHAR(1) NULL,
  BOOL_PROP_2 VARCHAR(1) NULL,
  PRIMARY KEY (SCHED_NAME, TRIGGER