org.springframework.jdbc.support

## Class DatabaseStartupValidator

- java.lang.Object
- - org.springframework.jdbc.support.DatabaseStartupValidator

- All Implemented Interfaces:
    InitializingBean

      public class DatabaseStartupValidator
      extends Object
      implements InitializingBean

  Bean that checks if a database has already started up. To be referenced via "depends-on" from beans that depend on database startup, like a Hibernate SessionFactory or custom data access objects that access a DataSource directly.

  Useful to defer application initialization until a database has started up. Particularly appropriate for waiting on a slowly starting Oracle database.

  Since:
    18.12.2003
  Author:
    Juergen Hoeller

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `DEFAULT_INTERVAL`
    `static int` | `DEFAULT_TIMEOUT`
    `protected Log` | `logger`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DatabaseStartupValidator()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `afterPropertiesSet()` Check whether the validation query can be executed on a Connection from the specified DataSource, with the specified interval between checks, until the specified timeout.
    `void` | `setDataSource(DataSource dataSource)` Set the DataSource to validate.
    `void` | `setInterval(int interval)` Set the interval between validation runs (in seconds).
    `void` | `setTimeout(int timeout)` Set the timeout (in seconds) after which a fatal exception will be thrown.
    `void` | `setValidationQuery(String validationQuery)` Set the SQL query string to use for validation.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### DEFAULT_INTERVAL

          public static final int DEFAULT_INTERVAL

      See Also:
        Constant Field Values

    - #### DEFAULT_TIMEOUT

          public static final int DEFAULT_TIMEOUT

      See Also:
        Constant Field Values

    - #### logger

          protected final Log logger

  - ### Constructor Detail

    - #### DatabaseStartupValidator

          public DatabaseStartupValidator()

  - ### Method Detail

    - #### setDataSource

          public void setDataSource(DataSource dataSource)

      Set the DataSource to validate.

    - #### setValidationQuery

          public void setValidationQuery(String validationQuery)

      Set the SQL query string to use for validation.

    - #### setInterval

          public void setInterval(int interval)

      Set the interval between validation runs (in seconds). Default is 1.

    - #### setTimeout

          public void setTimeout(int timeout)

      Set the timeout (in seconds) after which a fatal exception will be thrown. Default is 60.

    - #### afterPropertiesSet

          public void afterPropertiesSet()

      Check whether the validation query can be executed on a Connection from the specified DataSource, with the specified interval between checks, until the specified timeout.
      Specified by:
        `afterPropertiesSet` in interface `InitializingBean`