Is the statement prepared or not.
Source position: sqldb.pp line 444
|  public property TCustomSQLStatement.Prepared : Boolean | 
Prepared equals True if Prepare was called (implicitly or explicitly), it returns False if not. It can be set to True or False to call Prepare or UnPrepare, respectively.
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 | Prepare the statement for execution. | |
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 | Unprepare a previously prepared statement. |