Dbhelper Close

17.01.202017.01.2020

Dbhelper Close

Added inpublic SQLiteOpenHelper ( context,name,factory,int version)Create a helper object to create, open, and/or manage a database.This method always returns very quickly. The database is not actuallycreated or opened until one of oris called. ParameterscontextContext: to use for locating paths to the the databaseThis value may be null.nameString: of the database file, or null for an in-memory databaseThis value may be null.factorySQLiteDatabase.CursorFactory: to use for creating cursor objects, or null for the defaultThis value may be null.versionint: number of the database (starting at 1); if the database is older,will be used to upgrade the database; if the database isnewer, will be used to downgrade the database.

Added inpublic SQLiteOpenHelper ( context,name,factory,int version,errorHandler)Create a helper object to create, open, and/or manage a database.The database is not actually created or opened until one ofor is called.Accepts input param: a concrete instance of to beused to handle corruption when sqlite reports database corruption. Added inpublic SQLiteOpenHelper ( context,name,int version,openParams)Create a helper object to create, open, and/or manage a database.This method always returns very quickly.

The database is not actuallycreated or opened until one of oris called. ParameterscontextContext: to use for locating paths to the the databaseThis value may be null.nameString: of the database file, or null for an in-memory databaseThis value may be null.versionint: number of the database (starting at 1); if the database is older,will be used to upgrade the database; if the database isnewer, will be used to downgrade the databaseopenParamsSQLiteDatabase.OpenParams: configuration parameters that are used for opening.Please note that flag will always beset when the helper opens the databaseThis value must never be null.Public methods. Added inpublic getReadableDatabase Create and/or open a database. This will be the same object returned byunless some problem, such as a full disk,requires the database to be opened read-only. In that case, a read-onlydatabase object will be returned. If the problem is fixed, a future callto may succeed, in which case the read-onlydatabase object will be closed and the read/write object will be returnedin the future.Like, this method maytake a long time to return, so you should not call it from theapplication main thread, including from. Returnsa database object valid untilor is called.Throwsif the database cannot be opened.

Added inpublic void onDowngrade ( db,int oldVersion,int newVersion)Called when the database needs to be downgraded. This is strictly similar tomethod, but is called whenever current version is newer than requested one.However, this method is not abstract, so it is not mandatory for a customer toimplement it. If not overridden, default implementation will reject downgrade andthrows SQLiteExceptionThis method executes within a transaction. If an exception is thrown, all changeswill automatically be rolled back.ParametersdbSQLiteDatabase: The database.oldVersionint: The old database version.newVersionint: The new database version. Added inpublic abstract void onUpgrade ( db,int oldVersion,int newVersion)Called when the database needs to be upgraded. The implementationshould use this method to drop tables, add tables, or do anything else itneeds to upgrade to the new schema version.The SQLite ALTER TABLE documentation can be found. If you add new columnsyou can use ALTER TABLE to insert them into a live table.

If you rename or remove columnsyou can use ALTER TABLE to rename the old table, then create the new table and thenpopulate the new table with the contents of the old table.This method executes within a transaction. If an exception is thrown, all changeswill automatically be rolled back.ParametersdbSQLiteDatabase: The database.oldVersionint: The old database version.newVersionint: The new database version. Added inDeprecated inpublic void setIdleConnectionTimeout (long idleConnectionTimeoutMs)This method was deprecatedin API level 29.DO NOT USE this method. See the javadoc offor the details.Sets the maximum number of milliseconds that SQLite connection is allowed to be idlebefore it is closed and removed from the pool.This method should be called from the constructor of the subclass,before opening the databaseDO NOT USE this method.This feature has negative side effects that are very hard to foresee.See the javadoc offor the details. ParametersidleConnectionTimeoutMslong: timeout in milliseconds. Use valueto allow unlimited idle connections.Value is 0 or greater. Added inpublic void setLookasideConfig (int slotSize,int slotCount)ConfiguresThis method should be called from the constructor of the subclass,before opening the database, since lookaside memory configuration can only be changedwhen no connection is using itSQLite default settings will be used, if this method isn't called.Use setLookasideConfig(0,0) to disable lookasideNote: Provided slotSize/slotCount configuration is just a recommendation.The system may choose different values depending on a device, e.g.

Lookaside allocationscan be disabled on low-RAM devices ParametersslotSizeint: The size in bytes of each lookaside slot.Value is 0 or greaterslotCountint: The total number of lookaside memory slots per database connection.Value is 0 or greater.

Dbhelper Close

Returns the instance of this class associated with the database specified. Parameters: db - Database. Caches a set of features given the soup name.

Parameters: soupName - features -. getCachedFeatures public java.util.List getCachedFeatures(java.lang.String soupName) Parameters: soupName - Returns: The set of features belonging to the given soup name. getCachedHasFTS public java.lang.Boolean getCachedHasFTS(java.lang.String soupName) Parameters: soupName - Returns:. removeFromCache public void removeFromCache(java.lang.String soupName) Parameters: soupName -. getNextId public long getNextId(SQLiteDatabase db,java.lang.String tableName). If turned on, explain query plan is run before executing a query and stored in lastExplainQueryPlanand also get logged Parameters: captureExplainQueryPlan - true to turn capture on and false to turn off.

getLastExplainQueryPlan public JSONObject getLastExplainQueryPlan Returns: explain query plan for last query run (if captureExplainQueryPlan is true). getSoupTableNameFromDb protected java.lang.String getSoupTableNameFromDb(SQLiteDatabase db,java.lang.String soupName). safeClose protected void safeClose(Cursor cursor) Parameters: cursor.