Applied patch [ 1304191 ] support for MEMO fields

Francesco Montorsi


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36964 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/db.tex

@@ -3572,6 +3572,8 @@ wxDbTable constructor was called.}
     DB_DATA_TYPE_INTEGER        : non-floating point numbers
     DB_DATA_TYPE_FLOAT          : floating point numbers
     DB_DATA_TYPE_DATE           : dates
+    DB_DATA_TYPE_BLOB           : binary large objects
+    DB_DATA_TYPE_MEMO           : large strings
 \end{verbatim}
 
 \docparam{pData}{Pointer to the data object that will hold the column's

include/wx/db.h

@@ -158,6 +158,7 @@ const int DB_DATA_TYPE_INTEGER        = 2;
 const int DB_DATA_TYPE_FLOAT          = 3;
 const int DB_DATA_TYPE_DATE           = 4;
 const int DB_DATA_TYPE_BLOB           = 5;
+const int DB_DATA_TYPE_MEMO           = 6;
 
 const int DB_SELECT_KEYFIELDS         = 1;
 const int DB_SELECT_WHERE             = 2;
@@ -555,6 +556,7 @@ private:
     wxDbSqlTypeInfo typeInfFloat;
     wxDbSqlTypeInfo typeInfDate;
     wxDbSqlTypeInfo typeInfBlob;
+    wxDbSqlTypeInfo typeInfMemo;
 #endif
 
 public:
@@ -694,6 +696,7 @@ public:
     wxDbSqlTypeInfo GetTypeInfFloat()      {return typeInfFloat;}
     wxDbSqlTypeInfo GetTypeInfDate()       {return typeInfDate;}
     wxDbSqlTypeInfo GetTypeInfBlob()       {return typeInfBlob;}
+    wxDbSqlTypeInfo GetTypeInfMemo()       {return typeInfMemo;}
 
     // tableName can refer to a table, view, alias or synonym
     bool         TableExists(const wxString &tableName, const wxChar *userID=NULL,

src/common/db.cpp

@@ -532,6 +532,12 @@ void wxDb::initialize()
     typeInfBlob.CaseSensitive = 0;
     typeInfBlob.MaximumScale  = 0;
 
+    typeInfMemo.TypeName.Empty();
+    typeInfMemo.FsqlType      = 0;
+    typeInfMemo.Precision     = 0;
+    typeInfMemo.CaseSensitive = 0;
+    typeInfMemo.MaximumScale  = 0;
+
     // Error reporting is turned OFF by default
     silent = true;
 
@@ -650,6 +656,16 @@ bool wxDb::determineDataTypes(bool failOnDataTypeUnsupported)
         SQL_VARBINARY
     };
 
+    // These are the possible SQL types we check for use agains the datasource we are connected
+    // to for the purpose of determining which data type to use for the MEMO column types
+	// (a type which allow to store large strings; like VARCHAR just with a bigger precision)
+    //
+    // NOTE: The first type in this enumeration that is determined to be supported by the
+    //       datasource/driver is the one that will be used.
+    SWORD PossibleSqlMemoTypes[] = {
+        SQL_LONGVARCHAR,
+    };
+
 
     // Query the data source regarding data type information
 
@@ -756,6 +772,16 @@ bool wxDb::determineDataTypes(bool failOnDataTypeUnsupported)
     else if (failOnDataTypeUnsupported)
         return false;
 
+    // --------------- MEMO ---------------
+    for (iIndex = 0; iIndex < WXSIZEOF(PossibleSqlMemoTypes) &&
+                     !getDataTypeInfo(PossibleSqlMemoTypes[iIndex], typeInfMemo); ++iIndex)
+    {}
+
+    if (iIndex < WXSIZEOF(PossibleSqlMemoTypes))
+        typeInfMemo.FsqlType = PossibleSqlMemoTypes[iIndex];
+    else if (failOnDataTypeUnsupported)
+        return false;
+
     return true;
 }  // wxDb::determineDataTypes
 
@@ -790,6 +816,7 @@ bool wxDb::open(bool failOnDataTypeUnsupported)
     cout << wxT("FLOAT   DATA TYPE: ") << typeInfFloat.TypeName << endl;
     cout << wxT("DATE    DATA TYPE: ") << typeInfDate.TypeName << endl;
     cout << wxT("BLOB    DATA TYPE: ") << typeInfBlob.TypeName << endl;
+    cout << wxT("MEMO    DATA TYPE: ") << typeInfMemo.TypeName << endl;
     cout << endl;
 #endif
 
@@ -1050,12 +1077,20 @@ bool wxDb::Open(wxDb *copyDb)
     typeInfBlob.CaseSensitive    = copyDb->typeInfBlob.CaseSensitive;
     typeInfBlob.MaximumScale     = copyDb->typeInfBlob.MaximumScale;
 
+    // Memo
+    typeInfMemo.FsqlType         = copyDb->typeInfMemo.FsqlType;
+    typeInfMemo.TypeName         = copyDb->typeInfMemo.TypeName;
+    typeInfMemo.Precision        = copyDb->typeInfMemo.Precision;
+    typeInfMemo.CaseSensitive    = copyDb->typeInfMemo.CaseSensitive;
+    typeInfMemo.MaximumScale     = copyDb->typeInfMemo.MaximumScale;
+
 #ifdef DBDEBUG_CONSOLE
     cout << wxT("VARCHAR DATA TYPE: ") << typeInfVarchar.TypeName << endl;
     cout << wxT("INTEGER DATA TYPE: ") << typeInfInteger.TypeName << endl;
     cout << wxT("FLOAT   DATA TYPE: ") << typeInfFloat.TypeName << endl;
     cout << wxT("DATE    DATA TYPE: ") << typeInfDate.TypeName << endl;
     cout << wxT("BLOB    DATA TYPE: ") << typeInfBlob.TypeName << endl;
+    cout << wxT("MEMO    DATA TYPE: ") << typeInfMemo.TypeName << endl;
     cout << endl;
 #endif
 
@@ -2286,6 +2321,9 @@ bool wxDb::ExecSql(const wxString &pSqlStmt, wxDbColInf** columns, short& numcol
             case SQL_CHAR:
                 pColInf[colNum].dbDataType = DB_DATA_TYPE_VARCHAR;
                 break;
+            case SQL_LONGVARCHAR:
+                pColInf[colNum].dbDataType = DB_DATA_TYPE_MEMO;
+				break;
             case SQL_TINYINT:
             case SQL_SMALLINT:
             case SQL_INTEGER:
@@ -3069,6 +3107,9 @@ wxDbColInf *wxDb::GetColumns(const wxString &tableName, int *numCols, const wxCh
                         case SQL_CHAR:
                             colInf[colNo].dbDataType = DB_DATA_TYPE_VARCHAR;
                         break;
+                        case SQL_LONGVARCHAR:                        
+                            colInf[colNo].dbDataType = DB_DATA_TYPE_MEMO;
+							break;
                         case SQL_TINYINT:
                         case SQL_SMALLINT:
                         case SQL_INTEGER:

src/common/dbtable.cpp

@@ -413,11 +413,13 @@ void wxDbTable::setCbValueForColumn(int columnIndex)
     switch(colDefs[columnIndex].DbDataType)
     {
         case DB_DATA_TYPE_VARCHAR:
+        case DB_DATA_TYPE_MEMO:
             if (colDefs[columnIndex].Null)
                 colDefs[columnIndex].CbValue = SQL_NULL_DATA;
             else
                 colDefs[columnIndex].CbValue = SQL_NTS;
             break;
+            break;
         case DB_DATA_TYPE_INTEGER:
             if (colDefs[columnIndex].Null)
                 colDefs[columnIndex].CbValue = SQL_NULL_DATA;
@@ -484,6 +486,11 @@ bool wxDbTable::bindParams(bool forUpdate)
                 precision = colDefs[i].SzDataObj;
                 scale = 0;
                 break;
+            case DB_DATA_TYPE_MEMO:
+                fSqlType = pDb->GetTypeInfMemo().FsqlType;
+                precision = colDefs[i].SzDataObj;
+                scale = 0;
+                break;
             case DB_DATA_TYPE_INTEGER:
                 fSqlType = pDb->GetTypeInfInteger().FsqlType;
                 precision = pDb->GetTypeInfInteger().Precision;
@@ -1414,6 +1421,9 @@ bool wxDbTable::CreateTable(bool attemptDrop)
             case DB_DATA_TYPE_VARCHAR:
                 cout << pDb->GetTypeInfVarchar().TypeName << wxT("(") << (int)(colDefs[i].SzDataObj / sizeof(wxChar)) << wxT(")");
                 break;
+            case DB_DATA_TYPE_MEMO:
+                cout << pDb->GetTypeInfMemo().TypeName;
+                break;
             case DB_DATA_TYPE_INTEGER:
                 cout << pDb->GetTypeInfInteger().TypeName;
                 break;
@@ -1455,6 +1465,9 @@ bool wxDbTable::CreateTable(bool attemptDrop)
             case DB_DATA_TYPE_VARCHAR:
                 sqlStmt += pDb->GetTypeInfVarchar().TypeName;
                 break;
+            case DB_DATA_TYPE_MEMO:
+                sqlStmt += pDb->GetTypeInfMemo().TypeName;
+                break;
             case DB_DATA_TYPE_INTEGER:
                 sqlStmt += pDb->GetTypeInfInteger().TypeName;
                 break;
@@ -2349,6 +2362,11 @@ wxDbColDataPtr* wxDbTable::SetColDefs(wxDbColInf *pColInfs, UWORD numCols)
                    pColDataPtrs[index].SzDataObj  = pColInfs[index].bufferSize+(1*sizeof(wxChar));
                    pColDataPtrs[index].SqlCtype   = SQL_C_WXCHAR;
                    break;
+                case DB_DATA_TYPE_MEMO:
+                   pColDataPtrs[index].PtrDataObj = new wxChar[pColInfs[index].bufferSize+(1*sizeof(wxChar))];
+                   pColDataPtrs[index].SzDataObj  = pColInfs[index].bufferSize+(1*sizeof(wxChar));
+                   pColDataPtrs[index].SqlCtype   = SQL_C_WXCHAR;
+                   break;
                 case DB_DATA_TYPE_INTEGER:
                     // Can be long or short
                     if (pColInfs[index].bufferSize == sizeof(long))