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## org.quartz.impl.jdbcjobstore
Class UpdateLockRowSemaphore

    java.lang.Object
      org.quartz.impl.jdbcjobstore.DBSemaphore
          org.quartz.impl.jdbcjobstore.UpdateLockRowSemaphore

All Implemented Interfaces:
  Constants, Semaphore, StdJDBCConstants, TablePrefixAware

    public class UpdateLockRowSemaphore

extends DBSemaphore

Provide thread/resource locking in order to protect resources from being altered by multiple threads at the same time using a db row update.

Note: This Semaphore implementation is useful for databases that do not support row locking via "SELECT FOR UPDATE" type syntax, for example Microsoft SQLServer (MSSQL).

Field Summary
`static String` | `UPDATE_FOR_LOCK`

Fields inherited from interface org.quartz.impl.jdbcjobstore.StdJDBCConstants
`COUNT_MISFIRED_TRIGGERS_IN_STATES, DELETE_BLOB_TRIGGER, DELETE_CALENDAR, DELETE_CRON_TRIGGER, DELETE_FIRED_TRIGGER, DELETE_FIRED_TRIGGERS, DELETE_INSTANCES_FIRED_TRIGGERS, DELETE_JOB_DETAIL, DELETE_JOB_LISTENERS, DELETE_NO_RECOVERY_FIRED_TRIGGERS, DELETE_PAUSED_TRIGGER_GROUP, DELETE_PAUSED_TRIGGER_GROUPS, DELETE_SCHEDULER_STATE, DELETE_SIMPLE_TRIGGER, DELETE_TRIGGER, DELETE_TRIGGER_LISTENERS, DELETE_VOLATILE_FIRED_TRIGGERS, INSERT_BLOB_TRIGGER, INSERT_CALENDAR, INSERT_CRON_TRIGGER, INSERT_FIRED_TRIGGER, INSERT_JOB_DETAIL, INSERT_JOB_LISTENER, INSERT_PAUSED_TRIGGER_GROUP, INSERT_SCHEDULER_STATE, INSERT_SIMPLE_TRIGGER, INSERT_TRIGGER, INSERT_TRIGGER_LISTENER, SELECT_BLOB_TRIGGER, SELECT_CALENDAR, SELECT_CALENDAR_EXISTENCE, SELECT_CALENDARS, SELECT_CRON_TRIGGER, SELECT_FIRED_TRIGGER, SELECT_FIRED_TRIGGER_GROUP, SELECT_FIRED_TRIGGER_INSTANCE_NAMES, SELECT_FIRED_TRIGGERS, SELECT_FIRED_TRIGGERS_OF_JOB, SELECT_FIRED_TRIGGERS_OF_JOB_GROUP, SELECT_INSTANCES_FIRED_TRIGGERS, SELECT_INSTANCES_RECOVERABLE_FIRED_TRIGGERS, SELECT_JOB_DETAIL, SELECT_JOB_EXECUTION_COUNT, SELECT_JOB_EXISTENCE, SELECT_JOB_FOR_TRIGGER, SELECT_JOB_GROUPS, SELECT_JOB_LISTENERS, SELECT_JOB_STATEFUL, SELECT_JOBS_IN_GROUP, SELECT_MISFIRED_TRIGGERS, SELECT_MISFIRED_TRIGGERS_IN_GROUP_IN_STATE, SELECT_MISFIRED_TRIGGERS_IN_STATE, SELECT_MISFIRED_TRIGGERS_IN_STATES, SELECT_NEXT_FIRE_TIME, SELECT_NEXT_TRIGGER_TO_ACQUIRE, SELECT_NUM_CALENDARS, SELECT_NUM_JOBS, SELECT_NUM_TRIGGERS, SELECT_NUM_TRIGGERS_FOR_JOB, SELECT_NUM_TRIGGERS_IN_GROUP, SELECT_PAUSED_TRIGGER_GROUP, SELECT_PAUSED_TRIGGER_GROUPS, SELECT_REFERENCED_CALENDAR, SELECT_SCHEDULER_STATE, SELECT_SCHEDULER_STATES, SELECT_SIMPLE_TRIGGER, SELECT_STATEFUL_JOBS_OF_TRIGGER_GROUP, SELECT_TRIGGER, SELECT_TRIGGER_DATA, SELECT_TRIGGER_EXISTENCE, SELECT_TRIGGER_FOR_FIRE_TIME, SELECT_TRIGGER_GROUPS, SELECT_TRIGGER_LISTENERS, SELECT_TRIGGER_STATE, SELECT_TRIGGER_STATUS, SELECT_TRIGGERS_FOR_CALENDAR, SELECT_TRIGGERS_FOR_JOB, SELECT_TRIGGERS_IN_GROUP, SELECT_TRIGGERS_IN_STATE, SELECT_VOLATILE_JOBS, SELECT_VOLATILE_TRIGGERS, TABLE_PREFIX_SUBST, UPDATE_BLOB_TRIGGER, UPDATE_CALENDAR, UPDATE_CRON_TRIGGER, UPDATE_INSTANCES_FIRED_TRIGGER_STATE, UPDATE_JOB_DATA, UPDATE_JOB_DETAIL, UPDATE_JOB_TRIGGER_STATES, UPDATE_JOB_TRIGGER_STATES_FROM_OTHER_STATE, UPDATE_SCHEDULER_STATE, UPDATE_SIMPLE_TRIGGER, UPDATE_TRIGGER, UPDATE_TRIGGER_GROUP_STATE, UPDATE_TRIGGER_GROUP_STATE_FROM_STATE, UPDATE_TRIGGER_GROUP_STATE_FROM_STATES, UPDATE_TRIGGER_SKIP_DATA, UPDATE_TRIGGER_STATE, UPDATE_TRIGGER_STATE_FROM_OTHER_STATES_BEFORE_TIME, UPDATE_TRIGGER_STATE_FROM_STATE, UPDATE_TRIGGER_STATE_FROM_STATES, UPDATE_TRIGGER_STATES_FROM_OTHER_STATES`

Fields inherited from interface org.quartz.impl.jdbcjobstore.Constants
`ALIAS_COL_NEXT_FIRE_TIME, ALL_GROUPS_PAUSED, COL_BLOB, COL_CALENDAR, COL_CALENDAR_NAME, COL_CHECKIN_INTERVAL, COL_CRON_EXPRESSION, COL_DESCRIPTION, COL_END_TIME, COL_ENTRY_ID, COL_ENTRY_STATE, COL_FIRED_TIME, COL_INSTANCE_NAME, COL_IS_DURABLE, COL_IS_STATEFUL, COL_IS_VOLATILE, COL_JOB_CLASS, COL_JOB_DATAMAP, COL_JOB_GROUP, COL_JOB_LISTENER, COL_JOB_NAME, COL_LAST_CHECKIN_TIME, COL_LOCK_NAME, COL_MISFIRE_INSTRUCTION, COL_NEXT_FIRE_TIME, COL_PREV_FIRE_TIME, COL_PRIORITY, COL_REPEAT_COUNT, COL_REPEAT_INTERVAL, COL_REQUESTS_RECOVERY, COL_START_TIME, COL_TIME_ZONE_ID, COL_TIMES_TRIGGERED, COL_TRIGGER_GROUP, COL_TRIGGER_LISTENER, COL_TRIGGER_NAME, COL_TRIGGER_STATE, COL_TRIGGER_TYPE, DEFAULT_TABLE_PREFIX, STATE_ACQUIRED, STATE_BLOCKED, STATE_COMPLETE, STATE_DELETED, STATE_ERROR, STATE_EXECUTING, STATE_MISFIRED, STATE_PAUSED, STATE_PAUSED_BLOCKED, STATE_WAITING, TABLE_BLOB_TRIGGERS, TABLE_CALENDARS, TABLE_CRON_TRIGGERS, TABLE_FIRED_TRIGGERS, TABLE_JOB_DETAILS, TABLE_JOB_LISTENERS, TABLE_LOCKS, TABLE_PAUSED_TRIGGERS, TABLE_SCHEDULER_STATE, TABLE_SIMPLE_TRIGGERS, TABLE_TRIGGER_LISTENERS, TABLE_TRIGGERS, TTYPE_BLOB, TTYPE_CRON, TTYPE_SIMPLE`

Constructor Summary
`UpdateLockRowSemaphore()`

Method Summary
`protected void` | `executeSQL(Connection conn, String lockName, String expandedSQL)` Execute the SQL select for update that will lock the proper database row.
`protected String` | `getUpdateLockRowSQL()`
`void` | `setUpdateLockRowSQL(String updateLockRowSQL)`

Methods inherited from class org.quartz.impl.jdbcjobstore.DBSemaphore
`getLog, getSQL, getTablePrefix, isLockOwner, obtainLock, releaseLock, requiresConnection, setSQL, setTablePrefix`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### UPDATE_FOR_LOCK

    public static final String UPDATE_FOR_LOCK

See Also:
  Constant Field Values

Constructor Detail

### UpdateLockRowSemaphore

    public UpdateLockRowSemaphore()

Method Detail

### executeSQL

    protected void executeSQL(Connection conn,
                              String lockName,
                              String expandedSQL)
                       throws LockException

  Execute the SQL select for update that will lock the proper database row.

  Specified by:
    `executeSQL` in class `DBSemaphore`
  Throws:
    `LockException`

### getUpdateLockRowSQL

    protected String getUpdateLockRowSQL()

### setUpdateLockRowSQL

    public void setUpdateLockRowSQL(String updateLockRowSQL)

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