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- implemented TSQLQuery.SetSchemaInfo
- added support for delete and insert
This commit is contained in:
joost
parent
e5c50c40ee
commit
e2d68a7e4f
@ -24,6 +24,8 @@ interface
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uses SysUtils, Classes, DB;
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type TSchemaType = (stNoSchema, stTables, stSysTables, stProcedures, stColumns, stProcedureParams, stIndexes, stPackages);
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type
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TSQLConnection = class;
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TSQLTransaction = class;
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@ -83,9 +85,10 @@ type
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procedure CommitRetaining(trans : TSQLHandle); virtual; abstract;
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procedure RollBackRetaining(trans : TSQLHandle); virtual; abstract;
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procedure UpdateIndexDefs(var IndexDefs : TIndexDefs;TableName : string); virtual;
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function GetSchemaInfoSQL(SchemaType : TSchemaType; SchemaObjectName, SchemaPattern : string) : string; virtual;
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public
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destructor Destroy; override;
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property Handle: Pointer read GetHandle;
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destructor Destroy; override;
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published
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property Password : string read FPassword write FPassword;
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property Transaction : TSQLTransaction read FTransaction write SetTransaction;
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@ -142,6 +145,7 @@ type
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FReadOnly : boolean;
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FUpdateMode : TUpdateMode;
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FusePrimaryKeyAsKey : Boolean;
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// FSchemaInfo : TSchemaInfo;
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procedure FreeStatement;
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procedure PrepareStatement;
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@ -164,17 +168,17 @@ type
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procedure SetDatabase(Value : TDatabase); override;
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procedure InternalAddRecord(Buffer: Pointer; AAppend: Boolean); override;
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procedure InternalClose; override;
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procedure InternalDelete; override;
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procedure InternalHandleException; override;
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procedure InternalInitFieldDefs; override;
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procedure InternalOpen; override;
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function GetCanModify: Boolean; override;
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Function GetSQLStatementType(SQL : String) : TStatementType; virtual;
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function ApplyRecUpdate : boolean; override;
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function ApplyRecUpdate(UpdateKind : TUpdateKind) : boolean; override;
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public
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procedure ExecSQL; virtual;
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constructor Create(AOwner : TComponent); override;
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destructor Destroy; override;
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procedure SetSchemaInfo( SchemaType : TSchemaType; SchemaObjectName, SchemaPattern : string); virtual;
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published
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// redeclared data set properties
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property Active;
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@ -212,6 +216,7 @@ type
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property IndexDefs : TIndexDefs read GetIndexDefs;
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property UpdateMode : TUpdateMode read FUpdateMode write SetUpdateMode;
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property UsePrimaryKeyAsKey : boolean read FUsePrimaryKeyAsKey write SetUsePrimaryKeyAsKey;
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// property SchemaInfo : TSchemaInfo read FSchemaInfo default stNoSchema;
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end;
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implementation
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@ -285,6 +290,13 @@ begin
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end;
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function TSQLConnection.GetSchemaInfoSQL( SchemaType : TSchemaType; SchemaObjectName, SchemaPattern : string) : string;
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begin
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DatabaseError(SMetadataUnavailable);
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end;
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{ TSQLTransaction }
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procedure TSQLTransaction.EndTransaction;
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@ -467,11 +479,6 @@ begin
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inherited internalclose;
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end;
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procedure TSQLQuery.InternalDelete;
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begin
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// not implemented - sql dataset
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end;
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procedure TSQLQuery.InternalHandleException;
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begin
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end;
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@ -703,10 +710,6 @@ begin
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Setlength(S,PE-P);
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Move(P^,S[1],(PE-P));
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result := (DataBase as TSQLConnection).StrToStatementType(s);
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{ S:=Lowercase(s);
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For t:=stselect to strollback do
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if (S=StatementTokens[t]) then
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Exit(t);}
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end;
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procedure TSQLQuery.SetReadOnly(AValue : Boolean);
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@ -738,49 +741,105 @@ begin
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(DataBase as TSQLConnection).UpdateIndexDefs(FIndexDefs,FTableName);
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end;
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function TSQLQuery.ApplyRecUpdate : boolean;
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function TSQLQuery.ApplyRecUpdate(UpdateKind : TUpdateKind) : boolean;
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var r,x,f : integer;
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fieldsstr,
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v : string;
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modify_query : tsqlquery;
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var
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sql_tables : string;
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sql_set : string;
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sql_where : string;
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s : string;
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begin
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Result := False;
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sql_tables := FTableName;
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sql_set := '';
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sql_where := '';
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for x := 0 to Fields.Count -1 do
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begin
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procedure UpdateWherePart(var sql_where : string;x : integer);
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begin
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if (pfInKey in Fields[x].ProviderFlags) or
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((FUpdateMode = upWhereAll) and (pfInWhere in Fields[x].ProviderFlags)) or
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((FUpdateMode = UpWhereChanged) and (pfInWhere in Fields[x].ProviderFlags) and (fields[x].value <> fields[x].oldvalue)) then
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begin
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// This should be converted to something like GetAsSQLText, but better wait until variants (oldvalue) are working for strings
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s := fields[x].oldvalue; // This directly int the line below raises a variant-error
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sql_where := sql_where + '(' + fields[x].DisplayName + '=' + s + ') and ';
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sql_where := sql_where + '(' + fields[x].FieldName + '=' + s + ') and ';
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end;
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if (pfInUpdate in Fields[x].ProviderFlags) then
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if ord(ActiveBuffer[(Fields[x].Fieldno-1) div 8]) and (1 shl ((Fields[x].Fieldno-1) mod 8)) > 0 then // check for null
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sql_set := sql_set + fields[x].DisplayName + '=' + (Database as TSQLConnection).GetAsSQLText(nil) + ','
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else
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sql_set := sql_set + fields[x].DisplayName + '=' + (Database as TSQLConnection).GetAsSQLText(fields[x]) + ',';
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end;
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end;
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setlength(sql_set,length(sql_set)-1);
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setlength(sql_where,length(sql_where)-5);
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function ModifyRecQuery : string;
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var x : integer;
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sql_set : string;
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sql_where : string;
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begin
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sql_tables := FTableName;
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sql_set := '';
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sql_where := '';
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for x := 0 to Fields.Count -1 do
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begin
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UpdateWherePart(sql_where,x);
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if (pfInUpdate in Fields[x].ProviderFlags) then
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if fields[x].IsNull then // check for null
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sql_set := sql_set + fields[x].FieldName + '=' + (Database as TSQLConnection).GetAsSQLText(nil) + ','
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else
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sql_set := sql_set + fields[x].FieldName + '=' + (Database as TSQLConnection).GetAsSQLText(fields[x]) + ',';
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end;
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setlength(sql_set,length(sql_set)-1);
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setlength(sql_where,length(sql_where)-5);
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result := 'update ' + sql_tables + ' set ' + sql_set + ' where ' + sql_where;
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end;
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function InsertRecQuery : string;
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var x : integer;
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sql_fields : string;
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sql_values : string;
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begin
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sql_tables := FTableName;
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sql_fields := '';
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sql_values := '';
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for x := 0 to Fields.Count -1 do
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begin
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if not fields[x].IsNull then
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begin
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sql_fields := sql_fields + fields[x].DisplayName + ',';
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sql_values := sql_values + (Database as TSQLConnection).GetAsSQLText(fields[x]) + ',';
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end;
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end;
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setlength(sql_fields,length(sql_fields)-1);
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setlength(sql_values,length(sql_values)-1);
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result := 'insert into ' + sql_tables + ' (' + sql_fields + ') values (' + sql_values + ')';
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end;
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function DeleteRecQuery : string;
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var x : integer;
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sql_where : string;
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begin
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sql_tables := FTableName;
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sql_where := '';
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for x := 0 to Fields.Count -1 do
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UpdateWherePart(sql_where,x);
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setlength(sql_where,length(sql_where)-5);
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result := 'delete from ' + sql_tables + ' where ' + sql_where;
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end;
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begin
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Result := False;
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with tsqlquery.Create(nil) do
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begin
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DataBase := self.Database;
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transaction := self.transaction;
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sql.clear;
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s := 'update ' + sql_tables + ' set ' + sql_set + ' where ' + sql_where;
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case UpdateKind of
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ukModify : s := ModifyRecQuery;
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ukInsert : s := InsertRecQuery;
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ukDelete : s := DeleteRecQuery;
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end; {case}
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sql.add(s);
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ExecSQL;
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Result := true;
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@ -816,11 +875,23 @@ begin
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FUpdateMode := AValue;
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end;
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procedure TSQLQuery.SetSchemaInfo( SchemaType : TSchemaType; SchemaObjectName, SchemaPattern : string);
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begin
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SQL.Clear;
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SQL.Add((DataBase as tsqlconnection).GetSchemaInfoSQL(SchemaType, SchemaObjectName, SchemaPattern));
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end;
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end.
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{
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$Log$
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Revision 1.12 2005-01-24 10:52:43 michael
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Revision 1.13 2005-02-07 11:23:41 joost
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- implemented TSQLQuery.SetSchemaInfo
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- added support for delete and insert
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Revision 1.12 2005/01/24 10:52:43 michael
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* Patch from Joost van der Sluis
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- Made it possible to run 'show' queries for MySQL
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