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JDBC Extensions : DatabaseMetaData Interface (Salesforce Driver)
  
DatabaseMetaData Interface (Salesforce Driver)
The Salesforce driver extends the standard JDBC metadata results returned by the DatabaseMetaData.getColumns() method to include an additional column.
Column
Data Type
Description
IS_EXTERNAL_ID
VARCHAR (3), NOT NULL
Provides an indication of whether the column can be used as an External ID. External ID columns can be used as the lookup column for insert and upsert operations and foreign-key relationship values. Valid values are:
*YES: The column can be used as an external ID.
*NO: The column cannot be used as an external ID.
The standard catalog table SYSTEM_COLUMNS is also extended to include the IS_EXTERNAL_ID column.