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RAD Studio VCL Reference
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TBDEDataSet.ConstraintCallBack Method
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RAD Studio VCL Reference
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Specifies the callback function that allows the dataset to communicate with the BDE constraint layer.
function ConstraintCallBack(Req: DsInfoReq; var ADataSources: DataSources): DBIResult; stdcall;
__fastcall __stdcall DBIResult ConstraintCallBack(DsInfoReq Req, DataSources ADataSources);
Use the address of ConstraintCallBack as a parameter when making direct API calls to Borland Database Engine (BDE) functions that require a callback to provide information about the constraints on the dataset or its fields.
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Description