Class TDbCol

class TDbCol;

Description

Defines a column in a table or rowset.

The data members are public because this is really a structure to group the attributes of the column together.

Three non-default constructors are provided for convenience.

Members

Defined in TDbCol:
EAutoIncrement, ENotNull, IsLong(), TDbCol(), TDbCol(), TDbCol(), anonymous, iAttributes, iMaxLength, iName, iType

inline TDbCol();

Description

Constructs an uninitialised TDbCol. It is necessary because there are also non-default constructors in this class.

IMPORT_C TDbCol(const TDesC &aName, TDbColType aType);

Description

Parameters

const TDesC &aName TDbColType aType

IMPORT_C TDbCol(const TDesC &aName, TDbColType aType, TInt aMaxLength);

Description

Constructs a TDbCol with the given name, optional type and optional maximum length.

Note: The iAttributes member is initialised to 0.

Parameters

const TDesC &aName The column name. TDbColType aType The column type. TInt aMaxLength If present, this specifies a limit on how many characters may be stored in a Text column, or how many bytes can be stored in a Binary column. By default this is set to KDbDefaultTextColLength for Text (but not LongText) columns and KDbUndefinedLength for other columns.

static inline TBool IsLong(TDbColType aType);

Description

Tests if a column is of the Long column type, i.e. one of the EDbColLongXxxx types.

Parameters

TDbColType aType The column type to test.

Return value

TBool ETrue if the aType is a Long column type, EFalse otherwise.

n/a

Description

ENotNull EAutoIncrement

TDbColType iType;

Description

The column type.

TInt iMaxLength;

Description

The maximum length of data that can be stored in a Text or Binary column.

TUint iAttributes;

Description

A set of flags describing other column attributes. This must be one of the anonymous enum values ENotNull or EAutoIncrement.

TDbColNameC iName;

Description

The column name.