SqlImport

result = SQLImport(JSON, [DB], [callback], [overwrite])

Description

SqlImport converts a JSON object created using SqlExport into an SQLite database. The JSON object can come from an Ajax call or from any code which generates a valid JSON object.

SqlImport may report errors if the database used by SqlExport has features that are not supported on the current platform, or if the syntax of the Json is invalid. For example, Safari (at the time of this writing) does not support timestamp in constraints, images or indexes. Embedded carriage returns in string fields will also cause errors.You will need to remove these items from the database before doing SqlExport.

DB is an optional argument. If supplied, the reference to the database is assigned to it. There is no need to do an SqlOpenDatabase. It can be left empty if not needed.

callback is the name of a function to be called when the import is complete. If it is not supplied, execution will be blocked until the import is completed. If you do not have a callback function, put "" in this parameter.

overwrite can have the following values:

Value	Action
NSB.overwriteAlways	overwrite the existing database (default).
NSB.overwriteNever	only write out database if it does not exist yet.
NSB.overwriteIfVersionDifferent	overwrite if the version number of the database has changed.
NSB.overwriteIfVersionSame	overwrite if the version number of the database is the same.

result is a string which returns whether the operation was successful.

To get the version of a database, use DB.version(). To change the version of a database, use the command DB.changeVersion(oldVersionString, newVersionString). changeVersion() will not work on iOS before version 5.

To deploy a database with your app, simply add its name to extraFiles in Project Properties. An SQLImport() function will be automatically be invoked when you start your app to load the database the first time.

customers.db,DB,loadComplete,NSB.overwriteAlways

For more information on SQLite, see Using SQLite.

Example

Function btnSQLImport_onclick()
  SQLImport(DBjson, DB)
    
  'refresh the selection
  sqlList=Array(["SELECT * from customerData ORDER BY name;", dataHandler])
  Sql(DB, sqlList)
End Function

Output

(the database is imported and a selection is made)

Related Items

SQLExport