Enum SqlJetSafetyLevel
java.lang.Object
java.lang.Enum<SqlJetSafetyLevel>
org.tmatesoft.sqljet.core.internal.SqlJetSafetyLevel
- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable<SqlJetSafetyLevel>
,java.lang.constant.Constable
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)
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Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Enum
java.lang.Enum.EnumDesc<E extends java.lang.Enum<E>>
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Enum Constant Summary
Enum ConstantsEnum ConstantDescriptionThe 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).The journal is synced once before writes begin on the database.sqlite3OsSync() is never called. -
Method Summary
Modifier and TypeMethodDescriptionstatic 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, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
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Enum Constant Details
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OFF
sqlite3OsSync() is never called. This is the default for temporary and transient files. -
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
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.
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Method Details
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values
Returns an array containing the constants of this enum type, in the order they are declared.- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
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 namejava.lang.NullPointerException
- if the argument is null
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