X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f6e9a8189cfd9189418d6c0976a8a07f3bcd914b..cba1c2ca127cbc8ce1aeb87b13b968caff0f995e:/docs/latex/wx/db.tex diff --git a/docs/latex/wx/db.tex b/docs/latex/wx/db.tex index c4399fef46..0eec6208cf 100644 --- a/docs/latex/wx/db.tex +++ b/docs/latex/wx/db.tex @@ -373,10 +373,10 @@ datasources. Repeatedly call this function to obtain all the datasources available through the ODBC driver manager on the current workstation. \begin{verbatim} - wxStringList strList; + wxArrayString strArray; while (wxDbGetDataSource(DbConnectInf.GetHenv(), Dsn, SQL_MAX_DSN_LENGTH+1, DsDesc, 255)) - strList.Add(Dsn); + strArray.Add(Dsn); \end{verbatim} \latexignore{\rtfignore{\wxheading{Members}}} @@ -711,12 +711,20 @@ If the view does not exist, this function will return true. Note that views are \func{bool}{ExecSql}{\param{const wxString \&}{pSqlStmt}} +\func{bool}{ExecSql}{\param{const wxString \&}{pSqlStmt}, \param{wxDbColInf **}{columns}, \param{short \&}{numcols}} + Allows a native SQL command to be executed directly against the datasource. In addition to being able to run any standard SQL command, use of this function allows a user to (potentially) utilize features specific to the datasource they are connected to that may not be available through ODBC. The ODBC driver will pass the specified command directly to the datasource. +To get column amount and column names or other information about returned columns, pass {\it 'columns'} and {\it 'numcols'} parameters to the function also. + \wxheading{Parameters} \docparam{pSqlStmt}{Pointer to the SQL statement to be executed.} +\docparam{columns}{On success, this function will set this pointer to point to array of \helpref{wxDbColInf}{wxdbcolinf} objects, holding information about columns returned by the query. You need to call delete[] for the pointer you pass here after you don't use it anymore to prevent memory leak.} + +\docparam{numcols}{Reference to variable where amount of objects in {\it 'columns'}-parameter will be set.} + \wxheading{Remarks} This member extends the wxDb class and allows you to build and execute ANY VALID @@ -1605,6 +1613,12 @@ public. \helpref{database classes overview}{odbcoverview}, \helpref{wxDbTable::GetColDefs}{wxdbtablegetcoldefs}, \helpref{wxDb constructor}{wxdbctor} +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + \membersection{wxDbColDef::Initialize}\label{wxdbcoldefinitialize} Simply initializes all member variables to a cleared state. Called by @@ -1616,12 +1630,12 @@ Beginning support for handling international formatting specifically on dates and floats. \begin{verbatim} - wxString s_Field; // Formated String for Output - wxString s_Format[7]; // Formated Objects - TIMESTAMP has + wxString s_Field; // Formatted String for Output + wxString s_Format[7]; // Formatted Objects - TIMESTAMP has the biggest (7) - wxString s_Amount[7]; // Formated Objects - amount of + wxString s_Amount[7]; // Formatted Objects - amount of things that can be formatted - int i_Amount[7]; // Formated Objects - + int i_Amount[7]; // Formatted Objects - TT MM YYYY HH MM SS m int i_Nation; // 0 = timestamp 1 = EU @@ -1643,6 +1657,12 @@ Only one function is provided with this class currently. See the \helpref{database classes overview}{odbcoverview} for an introduction to using the ODBC classes. +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + \membersection{wxDbColFor::Format}\label{wxdbcolforformat} \func{int }{Format}{\param{int }{Nation}, \param{int }{dbDataType}, @@ -1699,6 +1719,12 @@ it is non-NULL. See the \helpref{database classes overview}{odbcoverview} for an introduction to using the ODBC classes. +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + \membersection{wxDbColInf::Initialize}\label{wxdbcolinfinitialize} Simply initializes all member variables to a cleared state. Called by @@ -1961,7 +1987,7 @@ Accessor function to set the user ID for this class instance. Accessor function to assign the user ID for this class instance. -\section{\class{wxDbIndexDef}}\label{wxdbindexdef} +\section{\class{wxDbIdxDef}}\label{wxdbidxdef} Used in creation of non-primary indexes. Currently there are no member functions for this class. @@ -1978,6 +2004,11 @@ There are no constructors/destructors as of this time, and no member functions. See the \helpref{database classes overview}{odbcoverview} for an introduction to using the ODBC classes. + +\wxheading{Include files} + + + \section{\class{wxDbInf}}\label{wxdbinf} Contains information regarding the database connection (datasource name, @@ -2005,6 +2036,12 @@ it is non-NULL. See the \helpref{database classes overview}{odbcoverview} for an introduction to using the ODBC classes. +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + \membersection{wxDbInf::Initialize}\label{wxdbinfinitialize} Simply initializes all member variables to a cleared state. Called by @@ -2032,7 +2069,7 @@ with the wxDbTable class. \begin{itemize}\itemsep=0pt \item \helpref{wxDbColDef}{wxdbcoldef} \item \helpref{wxDbColDataPtr}{wxdbcoldataptr} -\item \helpref{wxDbIndexDef}{wxdbindexdef} +\item \helpref{wxDbIdxDef}{wxdbidxdef} \end{itemize} \wxheading{Constants} @@ -2200,6 +2237,42 @@ and \helpref{wxDbTable::SetFromClause}{wxdbtablesetfromclause} are ignored by this function. +\membersection{wxDbTable::BuildWhereClause}\label{wxdbtablebuildwhereclause} + +\func{void}{BuildWhereClause}{\param{wxString \&}{pWhereClause}, +\param{int }{typeOfWhere}, \param{const wxString \&}{qualTableName=""}, +\param{bool }{useLikeComparison=false}} + +Constructs the portion of a SQL statement which would follow the word 'WHERE' +in a SQL statement to be passed to the datasource. The returned string +does NOT include the word 'WHERE'. + +\wxheading{Parameters} + +\docparam{pWhereClause}{Pointer to storage for the SQL statement retrieved. +To be sure you have adequate space allocated for the SQL statement, allocate +DB\_MAX\_STATEMENT\_LEN bytes.} +\docparam{typeOfWhere}{The type of where clause to generate. Can be one of +two values: DB\_WHERE\_KEYFIELDS or DB\_WHERE\_MATCHING.} +\docparam{qualTableName}{{\it OPTIONAL}. Prepended to all base table +column names. For use when a FROM clause has been specified with the +\helpref{wxDbTable::SetFromClause}{wxdbtablesetfromclause}, +to clarify which table a column name reference belongs to. Default is "".} +\docparam{useLikeComparison}{{\it OPTIONAL}. Should the constructed WHERE +clause utilize the LIKE comparison operator. If false, then the '=' +operator is used. Default is false.} + +\wxheading{Remarks} + +This member function allows you to see what the SQL WHERE clause looks like +that the ODBC class library builds. This can be used for debugging purposes +if you are having problems executing your own SQL statements. + +If using 'typeOfWhere' set to DB\_WHERE\_MATCHING, any bound columns currently +containing a NULL value are not included in the WHERE clause's list of +columns to use in the comparison. + + \membersection{wxDbTable::CanSelectForUpdate}\label{wxdbtablecanselectforupdate} \func{bool}{CanSelectForUpdate}{\void} @@ -2381,7 +2454,7 @@ this function. \membersection{wxDbTable::CreateIndex}\label{wxdbtablecreateindex} \func{bool}{CreateIndex}{\param{const wxString \&}{IndexName}, \param{bool }{unique}, -\param{UWORD }{numIndexColumns}, \param{wxDbIndexDef *}{pIndexDefs}, +\param{UWORD }{numIndexColumns}, \param{wxDbIdxDef *}{pIndexDefs}, \param{bool }{attemptDrop=true}} This member function allows you to create secondary (non primary) indexes on @@ -2400,7 +2473,7 @@ take advantage of those indexes. space of the datasource.} \docparam{unique}{Indicates if this index is unique.} \docparam{numIndexColumns}{Number of columns in the index.} -\docparam{pIndexDefs}{A pointer to an array \helpref{wxDbIndexDef}{wxdbindexdef} structures. } +\docparam{pIndexDefs}{A pointer to an array \helpref{wxDbIdxDef}{wxdbidxdef} structures. } \docparam{attemptDrop}{{\it OPTIONAL}. Indicates if the function should try to execute a \helpref{wxDbTable::DropIndex}{wxdbtabledropindex} on the index name provided before trying to create the index name. Default is true.} @@ -2422,9 +2495,9 @@ In the third parameter, specify how many columns are in your index. This number must match the number of columns defined in the 'pIndexDefs' parameter. The fourth parameter specifies which columns make up the index using the -\helpref{wxDbIndexDef}{wxdbindexdef} structure. For each column in the index, you must specify two +\helpref{wxDbIdxDef}{wxdbidxdef} structure. For each column in the index, you must specify two things, the column name and the sort order (ascending / descending). See -the example below to see how to build and pass in the \helpref{wxDbIndexDef}{wxdbindexdef} structure. +the example below to see how to build and pass in the \helpref{wxDbIdxDef}{wxdbidxdef} structure. The fifth parameter is provided to handle the differences in datasources as to whether they will automatically overwrite existing indexes with the same @@ -2449,7 +2522,7 @@ after executing this function. \begin{verbatim} // Create a secondary index on the PARTS table - wxDbIndexDef IndexDef[2]; // 2 columns make up the index + wxDbIdxDef IndexDef[2]; // 2 columns make up the index wxStrcpy(IndexDef[0].ColName, "PART_DESC"); // Column 1 IndexDef[0].Ascending = true; @@ -2709,7 +2782,7 @@ of this function). \wxheading{Parameters} -\docparam{From}{A comma separated list of table names that are to be outer +\docparam{From}{A comma separated list of table names that are to be inner joined with the base table's columns so that the joined table's columns may be returned in the result set or used as a portion of a comparison with the base table's columns. NOTE that the base tables name must NOT be included @@ -3184,7 +3257,7 @@ records to be retrieved (e.g. All users with a first name of "JOHN"). Use \helpref{wxDbTable::SetOrderByClause}{wxdbtablesetorderbyclause} to change the sequence in which records are returned in the result set from the datasource (e.g. Ordered by LAST\_NAME). Use -\helpref{wxDbTable::SetFromClause}{wxdbtablesetfromclause} to allow outer +\helpref{wxDbTable::SetFromClause}{wxdbtablesetfromclause} to allow inner joining of the base table (the one being associated with this instance of wxDbTable) with other tables which share a related field. @@ -3616,14 +3689,14 @@ and saving a pointer to that cursor. \func{void}{SetFromClause}{\param{const wxString \&}{From}} Accessor function for setting the private class member wxDbTable::from -that indicates what other tables should be outer joined with the wxDbTable's +that indicates what other tables should be inner joined with the wxDbTable's base table for access to the columns in those other tables. Synonym to this function is one form of \helpref{wxDbTable::From}{wxdbtablefrom} \wxheading{Parameters} -\docparam{From}{A comma separated list of table names that are to be outer +\docparam{From}{A comma separated list of table names that are to be inner joined with the base table's columns so that the joined table's columns may be returned in the result set or used as a portion of a comparison with the base table's columns. NOTE that the base tables name must NOT be included @@ -3633,7 +3706,7 @@ in constructing query statements.} \wxheading{Remarks} Used by the \helpref{wxDbTable::Query}{wxdbtablequery} and -\helpref{wxDbTable::Count}{wxdbtablecount} member functions to allow outer +\helpref{wxDbTable::Count}{wxdbtablecount} member functions to allow inner joining of records from multiple tables. Do {\bf not} include the keyword "FROM" when setting the FROM clause. @@ -3648,7 +3721,7 @@ the datasource knows on which column values the tables should be joined on. \begin{verbatim} ... // Base table is the "LOCATION" table, and it is being - // outer joined to the "PART" table via the the field "PART_NUMBER" + // inner joined to the "PART" table via the field "PART_NUMBER" // that can be related between the two tables. location->SetWhereClause("LOCATION.PART_NUMBER = PART.PART_NUMBER") location->SetFromClause("PART"); @@ -3782,7 +3855,7 @@ Do {\bf not} include the keywords "WHERE" when setting the WHERE clause. // Using parameters and multiple logical combinations parts->Where("((QTY > 10) OR (ON_ORDER > 0)) AND ON_HOLD = 0"); ... - // This query uses an outer join (requiring a FROM clause also) + // This query uses an inner join (requiring a FROM clause also) // that joins the PART and LOCATION table on he common field // PART_NUMBER. parts->Where("PART.ON_HOLD = 0 AND \ @@ -3932,6 +4005,12 @@ Eventually, accessor functions will be added for this class See the \helpref{database classes overview}{odbcoverview} for an introduction to using the ODBC classes. +\wxheading{Include files} + + + +\latexignore{\rtfignore{\wxheading{Members}}} + \membersection{wxDbTableInf::Initialize}\label{wxdbtableinfinitialize} Simply initializes all member variables to a cleared state. Called by