TDBXColumnsColumns Class

Accesses columns by name in the Columns metadata.

Pascal

TDBXColumnsColumns = class;

C++

class TDBXColumnsColumns;

File

DBXMetaDataNames

Description

TDBXColumnsColumns is used to access columns by name in the Columns metadata collection. These columns are returned when TDBXCommand.Text is TDBXMetaDataCommands.GetColumns when reading metadata. To retrieve metadata columns, use these constants to index the TDBXReader instance returned by TDBXCommand.ExecuteQuery.

This table describes the columns.

Column Name	Data Type of Column Data	Description
CatalogName	String	Catalog name.
SchemaName	String	Schema name.
TableName	String	Table name.
ColumnName	String	Column name.
TypeName	String	Database specific data type name.
Precision	Int32	Precision of this type. For a string data type, this is the maximum number of characters. For a decimal types, this is the maximum number digits including digits from the scale.
Scale	Int32	Scale of a decimal type.
Ordinal	Int32	Position in the rows of the table starting with 1.
DefaultValue	String	Default value.
IsNullable	Boolean	True if accepts NULL values; false otherwise.
IsAutoIncrement	Boolean	Is an autoincrement value.
MaxInline	Int32	The maximal number of bytes to write into row. The rest of the data is handled as a BLOB. (Blackfish SQL only).
DbxDataType	Int32	dbExpress data type.
IsFixedLength	Boolean	True if holds fixed length data; false otherwise.
IsUnicode	Boolean	Can hold Unicode characters.
IsLong	Boolean	Is a BLOB data type.
IsUnsigned	Boolean	Is an unsigned numeric type.