Enum SqlJetSafetyLevel

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<SqlJetSafetyLevel>

    public enum SqlJetSafetyLevel
    extends java.lang.Enum<SqlJetSafetyLevel>
    Valuest to adjust the robustness of the database to damage due to OS crashes or power failures by changing the number of syncs()s when writing the rollback journal.
    Author:
    TMate Software Ltd., Sergey Scherbina (sergey.scherbina@gmail.com)
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      FULL
      The journal is synced twice before writes begin on the database (with some additional information - the nRec field of the journal header - being written in between the two syncs).
      NORMAL
      The journal is synced once before writes begin on the database.
      OFF
      sqlite3OsSync() is never called.
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static SqlJetSafetyLevel valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static SqlJetSafetyLevel[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • OFF

        public static final SqlJetSafetyLevel OFF
        sqlite3OsSync() is never called. This is the default for temporary and transient files.
      • NORMAL

        public static final SqlJetSafetyLevel NORMAL
        The journal is synced once before writes begin on the database. This is normally adequate protection, but it is theoretically possible, though very unlikely, that an inopertune power failure could leave the journal in a state which would cause damage to the database when it is rolled back.
      • FULL

        public static final SqlJetSafetyLevel FULL
        The journal is synced twice before writes begin on the database (with some additional information - the nRec field of the journal header - being written in between the two syncs). If we assume that writing a single disk sector is atomic, then this mode provides assurance that the journal will not be corrupted to the point of causing damage to the database during rollback.
    • Method Detail

      • values

        public static SqlJetSafetyLevel[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (SqlJetSafetyLevel c : SqlJetSafetyLevel.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static SqlJetSafetyLevel valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null