如何在 Quartz 中使用 SQLite？

Question

我正在尝试在应用程序中将石英与 SQLite 一起使用。当我阅读文档here 时，我注意到他们没有在可用的数据库中提到 SQLite。他们说：

JDBCJobStore 几乎适用于任何数据库，它已被广泛使用 使用 Oracle、PostgreSQL、MySQL、MS SQLServer、HSQLDB 和 DB2。使用 JDBCJobStore，必须先创建一组数据库表 石英使用。您可以在 Quartz 发行版的“docs/dbTables”目录。

所以，从这个问题：Which setup script to use for setting up quartz sqlite table? 我使用 derby 脚本作为我的 sqlite 脚本。

问题是当我尝试在之前插入的作业中安排触发器时。这是我的代码的一部分：

// and start it off
scheduler.start();

Map<String, String> map = new HashMap<>();
map.put("key", "value");

JobDataMap jdm = new JobDataMap(map);

JobKey key = new JobKey("job1", "key1");

 if(!scheduler.checkExists(key)){
     JobDetail job = newJob(HelloJob.class).withIdentity(key).storeDurably().usingJobData(jdm).build();
     addJob(scheduler, job);

     // Trigger the job to run now, and then repeat every 40 seconds
    Trigger trigger = newTrigger()
         .withIdentity("trigger1", "group1")
         .startNow()
            .forJob(job)
               .withSchedule(simpleSchedule()
                 .withIntervalInSeconds(40)
                 .repeatForever())            
         .build();

    // Tell quartz to schedule the job using our trigger
    scheduler.scheduleJob(trigger); // here is where I get an error
 }

Thread.sleep(60000);

scheduler.shutdown();

我的quartz.properties 是这样的：

org.quartz.scheduler.instanceName = MyScheduler
org.quartz.threadPool.threadCount = 5
org.quartz.jobStore.class = org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.tablePrefix = QRTZ_
org.quartz.dataSource.SQLiteDB.driver = org.sqlite.JDBC
org.quartz.dataSource.SQLiteDB.URL = jdbc:sqlite:bota.db
org.quartz.dataSource.SQLiteDB.maxConnections = 30
org.quartz.jobStore.driverDelegateClass = org.quartz.impl.jdbcjobstore.StdJDBCDelegate
org.quartz.jobStore.dataSource = SQLiteDB

我正在使用 sqlite v-3.8.11.2 和石英 v-2.2.2。这是我在日志中得到的：

org.quartz.JobPersistenceException: Couldn't store trigger 'group1.trigger1' for 'key1.job1' job:Couldn't retrieve job: not implemented by SQLite JDBC driver [See nested exception: org.quartz.JobPersistenceException: Couldn't retrieve job: not implemented by SQLite JDBC driver [See nested exception: java.sql.SQLException: not implemented by SQLite JDBC driver]]
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.storeTrigger(JobStoreSupport.java:1223)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$4.executeVoid(JobStoreSupport.java:1159)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$VoidTransactionCallback.execute(JobStoreSupport.java:3715)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$VoidTransactionCallback.execute(JobStoreSupport.java:3713)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3799)
    at org.quartz.impl.jdbcjobstore.JobStoreTX.executeInLock(JobStoreTX.java:93)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.storeTrigger(JobStoreSupport.java:1155)
    at org.quartz.core.QuartzScheduler.scheduleJob(QuartzScheduler.java:932)
    at org.quartz.impl.StdScheduler.scheduleJob(StdScheduler.java:258)
    at javaapplication2.JavaApplication2.main(JavaApplication2.java:174)
Caused by: org.quartz.JobPersistenceException: Couldn't retrieve job: not implemented by SQLite JDBC driver [See nested exception: java.sql.SQLException: not implemented by SQLite JDBC driver]
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveJob(JobStoreSupport.java:1396)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.storeTrigger(JobStoreSupport.java:1205)
    ... 9 more
Caused by: java.sql.SQLException: not implemented by SQLite JDBC driver
    at org.sqlite.jdbc4.JDBC4ResultSet.unused(JDBC4ResultSet.java:320)
    at org.sqlite.jdbc4.JDBC4ResultSet.getBlob(JDBC4ResultSet.java:345)
    at com.mchange.v2.c3p0.impl.NewProxyResultSet.getBlob(NewProxyResultSet.java:285)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.getObjectFromBlob(StdJDBCDelegate.java:3190)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectJobDetail(StdJDBCDelegate.java:860)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveJob(JobStoreSupport.java:1385)
    ... 10 more
BUILD STOPPED (total time: 11 seconds)

Answer 1

问题似乎是sqlite jdbc驱动does not support the method ResultSet.getBlob()。

但quartz使用这种方法来检索分配给Job的JobDataMap。

如果您仍想将石英与 sqlite 一起使用，您可以扩展 StdJDBCDelegate 并检索/设置 blob，如建议的 in this answer。

乍一看，您似乎只需要重写方法

1. StdJDBCDelegate.getObjectFromBlob() 和
2. StdJDBCDelegate.getJobDataFromBlob()

由于我不确定以后是否会出现更多问题（例如，您可以看到 sqlite jdbcdriver 有更多unsupported ResultSet methods），我宁愿建议使用开箱即用的数据库。

Answer 2

根据 mam10eks 的建议，以下代码对我有用。

package com.example.quartz.sqlite;   

import org.quartz.impl.jdbcjobstore.StdJDBCDelegate;

import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.sql.ResultSet;
import java.sql.SQLException;

public class CustomJDBCDelegate extends StdJDBCDelegate {
  @Override
  protected Object getObjectFromBlob(ResultSet rs, String colName) throws ClassNotFoundException, IOException, SQLException {
    byte[] bytes = rs.getBytes(colName);
    Object map = null;
    ByteArrayInputStream bais = null;
    ObjectInputStream ois = null;
    try {
      bais = new ByteArrayInputStream(bytes);
      ois = new ObjectInputStream(bais);
      map = ois.readObject();
    } catch (EOFException ex1) {
      bais.close();
    } catch (IOException e) {
      // Error in de-serialization
      e.printStackTrace();
    }

    return map;
  }

  @Override
  protected Object getJobDataFromBlob(ResultSet rs, String colName) throws ClassNotFoundException, IOException, SQLException {
    return getObjectFromBlob(rs, colName);
  }
}

现在将以下内容放入quartz.properties

org.quartz.jobStore.driverDelegateClass=com.example.quartz.sqlite.CustomJDBCDelegate