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[wxWidgets.git] / docs / latex / wx / query.tex

\section{\class{wxQueryCol}}\label{wxquerycol}

Every ODBC data column is represented by an instance of this class.

\wxheading{Derivation}

\helpref{wxObject}{wxobject}

\wxheading{See also}

\overview{wxQueryCol overview}{wxquerycoloverview}, \overview{wxDatabase overview}{wxdatabaseoverview}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxQueryCol::wxQueryCol}

\func{void}{wxQueryCol}{\void}

Constructor. Sets the attributes of the column to default values.

\membersection{wxQueryCol::\destruct{wxQueryCol}}

\func{void}{\destruct{wxQueryCol}}{\void}

Destructor. Deletes the wxQueryField list.

\membersection{wxQueryCol::BindVar}

\func{void *}{BindVar}{\param{void *}{v}, \param{long}{ sz}}

Binds a user-defined variable to a column. Whenever a column is bound to a
variable, it will automatically copy the data of the current field into this
buffer (to a maximum of {\it sz} bytes).

\membersection{wxQueryCol::FillVar}

\func{void}{FillVar}{\param{int}{ recnum}}

Fills the bound variable with the data of the field recnum. When no variable
is bound to the column nothing will happen.

\membersection{wxQueryCol::GetData}

\func{void *}{GetData}{\param{int}{ field}}

Returns a pointer to the data of the field.

\membersection{wxQueryCol::GetName}

\func{wxString}{GetName}{\void}

Returns the name of a column.
  
\membersection{wxQueryCol::GetType}

\func{short}{GetType}{\void}

Returns the data type of a column.

\membersection{wxQueryCol::GetSize}

\func{long}{GetSize}{\param{int}{ field}}

Return the size of the data of the field field.

\membersection{wxQueryCol::IsRowDirty}

\func{bool}{IsRowDirty}{\param{int}{ field}}

Returns TRUE if the given field has been changed, but not saved.

\membersection{wxQueryCol::IsNullable}

\func{bool}{IsNullable}{\void}

Returns TRUE if a column may contain no data.

\membersection{wxQueryCol::AppendField}

\func{void}{AppendField}{\param{void *}{buf}, \param{long}{ len}}

Appends a wxQueryField instance to the field list of the column. {\it len} bytes from\rtfsp
{\it buf} will be copied into the field's buffer.

\membersection{wxQueryCol::SetData}

\func{bool}{SetData}{\param{int}{ field}, \param{void *}{buf}, \param{long}{ len}}

Sets the data of a field. This function finds the wxQueryField corresponding to\rtfsp
{\it field} and calls wxQueryField::SetData with {\it buf} and {\it len} arguments.

\membersection{wxQueryCol::SetName}

\func{void}{SetName}{\param{const wxString\& }{name}}

Sets the name of a column. Only useful when creating new tables or
appending columns.
 
\membersection{wxQueryCol::SetNullable}

\func{void}{SetNullable}{\param{bool}{ nullable}}

Determines whether a column may contain no data. Only useful when creating new tables or
appending columns.

\membersection{wxQueryCol::SetFieldDirty}

\func{void}{SetFieldDirty}{\param{int}{ field}, \param{bool }{dirty = TRUE}}

Sets the dirty tag of a given field.

\membersection{wxQueryCol::SetType}

\func{void}{SetType}{\param{short}{ type}}
  
Sets the data type of a column. Only useful when creating new tables or
appending columns.

\section{\class{wxQueryField}}\label{wxqueryfield}

Represents the data item for one or several columns.

\wxheading{Derivation}

\helpref{wxObject}{wxobject}

\wxheading{See also}

\overview{wxQueryField overview}{wxqueryfieldoverview}, \overview{wxDatabase overview}{wxdatabaseoverview}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxQueryField::wxQueryField}

\func{}{wxQueryField}{\void}

Constructor. Sets type and size of the field to default values.
  
\membersection{wxQueryField::\destruct{wxQueryField}}

\func{}{\destruct{wxQueryField}}{\void}

Destructor. Frees the associated memory depending on the field type.

\membersection{wxQueryField::AllocData}

\func{bool}{AllocData}{\void}

Allocates memory depending on the size and type of the field.

\membersection{wxQueryField::ClearData}

\func{void}{ClearData}{\void}

Deletes the contents of the field buffer without deallocating the memory.

\membersection{wxQueryField::GetData}

\func{void *}{GetData}{\void}

Returns a pointer to the field buffer.

\membersection{wxQueryField::GetSize}

\func{long}{GetSize}{\void}

Returns the size of the field buffer.

\membersection{wxQueryField::GetType}

\func{short}{GetType}{\void}

Returns the type of the field (currently SQL\_CHAR, SQL\_VARCHAR or SQL\_INTEGER).
 
\membersection{wxQueryField::IsDirty}

\func{bool}{IsDirty}{\void}

Returns TRUE if the data of a field has been changed, but not saved.

\membersection{wxQueryField::SetData}

\func{bool}{SetData}{\param{void *}{data}, \param{long}{ sz}}

Allocates memory of the size {\it sz} and copies the contents of {\it d} into the
field buffer.
  
\membersection{wxQueryField::SetDirty}

\func{void}{SetDirty}{\param{bool}{ dirty = TRUE}}

Sets the dirty tag of a field.

\membersection{wxQueryField::SetSize}

\func{void}{SetSize}{\param{long}{ size}}

Resizes the field buffer. Stored data will be lost.
  
\membersection{wxQueryField::SetType}

\func{void}{SetType}{\param{short }{type}}

Sets the type of the field. Currently the types SQL\_CHAR, SQL\_VARCHAR and
SQL\_INTEGER are supported.