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|
{$mode objfpc}{$H+}
{$MACRO on}
interface
uses
Classes, SysUtils,sqldb,db,dynlibs,
{$IfDef mysql50}
mysql50dyn;
{$DEFINE TConnectionName:=TMySQL50Connection}
{$DEFINE TTransactionName:=TMySQL50Transaction}
{$DEFINE TCursorName:=TMySQL50Cursor}
{$ELSE}
{$IfDef mysql41}
mysql41dyn;
{$DEFINE TConnectionName:=TMySQL41Connection}
{$DEFINE TTransactionName:=TMySQL41Transaction}
{$DEFINE TCursorName:=TMySQL41Cursor}
{$ELSE}
{$IFDEF mysql4} // temporary backwards compatibility for Lazarus
mysql40dyn;
{$DEFINE TConnectionName:=TMySQLConnection}
{$DEFINE TTransactionName:=TMySQLTransaction}
{$DEFINE TCursorName:=TMySQLCursor}
{$ELSE}
mysql40dyn;
{$DEFINE TConnectionName:=TMySQL40Connection}
{$DEFINE TTransactionName:=TMySQL40Transaction}
{$DEFINE TCursorName:=TMySQL40Cursor}
{$EndIf}
{$EndIf}
{$EndIf}
Type
TTransactionName = Class(TSQLHandle)
protected
end;
TCursorName = Class(TSQLCursor)
protected
FQMySQL : PMySQL;
FRes: PMYSQL_RES; { Record pointer }
FNeedData : Boolean;
FStatement : String;
Row : MYSQL_ROW;
RowsAffected : QWord;
LastInsertID : QWord;
ParamBinding : TParamBinding;
ParamReplaceString : String;
end;
TConnectionName = class (TSQLConnection)
private
FDialect: integer;
FHostInfo: String;
FServerInfo: String;
FMySQL : PMySQL;
FDidConnect : Boolean;
function GetClientInfo: string;
function GetServerStatus: String;
procedure ConnectMySQL(var HMySQL : PMySQL;H,U,P : pchar);
protected
function StrToStatementType(s : string) : TStatementType; override;
Procedure ConnectToServer; virtual;
Procedure SelectDatabase; virtual;
function MySQLDataType(AType: enum_field_types; ASize, ADecimals: Integer; var NewType: TFieldType; var NewSize: Integer): Boolean;
function MySQLWriteData(AType: enum_field_types;ASize: Integer; AFieldType: TFieldType;Source, Dest: PChar): Boolean;
// SQLConnection methods
procedure DoInternalConnect; override;
procedure DoInternalDisconnect; override;
function GetHandle : pointer; override;
function GetAsSQLText(Field : TField) : string; overload; virtual;
function GetAsSQLText(Param : TParam) : string; overload; virtual;
Function AllocateCursorHandle : TSQLCursor; override;
Procedure DeAllocateCursorHandle(var cursor : TSQLCursor); override;
Function AllocateTransactionHandle : TSQLHandle; override;
procedure PrepareStatement(cursor: TSQLCursor;ATransaction : TSQLTransaction;buf : string; AParams : TParams); override;
procedure UnPrepareStatement(cursor:TSQLCursor); override;
procedure FreeFldBuffers(cursor : TSQLCursor); override;
procedure Execute(cursor: TSQLCursor;atransaction:tSQLtransaction;AParams : TParams); override;
procedure AddFieldDefs(cursor: TSQLCursor; FieldDefs : TfieldDefs); override;
function Fetch(cursor : TSQLCursor) : boolean; override;
function LoadField(cursor : TSQLCursor;FieldDef : TfieldDef;buffer : pointer) : boolean; override;
function GetTransactionHandle(trans : TSQLHandle): pointer; override;
function Commit(trans : TSQLHandle) : boolean; override;
function RollBack(trans : TSQLHandle) : boolean; override;
function StartdbTransaction(trans : TSQLHandle; AParams : string) : boolean; override;
procedure CommitRetaining(trans : TSQLHandle); override;
procedure RollBackRetaining(trans : TSQLHandle); override;
procedure UpdateIndexDefs(var IndexDefs : TIndexDefs;TableName : string); override;
Public
Property ServerInfo : String Read FServerInfo;
Property HostInfo : String Read FHostInfo;
property ClientInfo: string read GetClientInfo;
property ServerStatus : String read GetServerStatus;
published
property Dialect : integer read FDialect write FDialect;
property DatabaseName;
property HostName;
property KeepConnection;
property LoginPrompt;
property Params;
property OnLogin;
end;
EMySQLError = Class(Exception);
implementation
uses dbconst;
{ TConnectionName }
Resourcestring
SErrServerConnectFailed = 'Server connect failed.';
SErrDatabaseSelectFailed = 'failed to select database: %s';
SErrDatabaseCreate = 'Failed to create database: %s';
SErrDatabaseDrop = 'Failed to drop database: %s';
SErrNoData = 'No data for record';
SErrExecuting = 'Error executing query: %s';
SErrFetchingdata = 'Error fetching row data: %s';
SErrGettingResult = 'Error getting result set: %s';
SErrNoQueryResult = 'No result from query.';
SErrNotversion50 = 'TMySQL50Connection can not work with the installed MySQL client version (%s).';
SErrNotversion41 = 'TMySQL41Connection can not work with the installed MySQL client version (%s).';
SErrNotversion40 = 'TMySQL40Connection can not work with the installed MySQL client version (%s).';
Procedure MySQlError(R : PMySQL;Msg: String;Comp : TComponent);
Var
MySQLMsg : String;
begin
If (R<>Nil) then
begin
MySQLMsg:=Strpas(mysql_error(R));
DatabaseErrorFmt(Msg,[MySQLMsg],Comp);
end
else
DatabaseError(Msg,Comp);
end;
function TConnectionName.StrToStatementType(s : string) : TStatementType;
begin
S:=Lowercase(s);
if s = 'show' then exit(stSelect);
result := inherited StrToStatementType(s);
end;
function TConnectionName.GetClientInfo: string;
Var
B : Boolean;
begin
// To make it possible to call this if there's no connection yet
B:=(MysqlLibraryHandle=Nilhandle);
If B then
InitialiseMysql;
Try
Result:=strpas(mysql_get_client_info());
Finally
if B then
ReleaseMysql;
end;
end;
function TConnectionName.GetServerStatus: String;
begin
CheckConnected;
Result := mysql_stat(FMYSQL);
end;
procedure TConnectionName.ConnectMySQL(var HMySQL : PMySQL;H,U,P : pchar);
begin
HMySQL := mysql_init(HMySQL);
HMySQL:=mysql_real_connect(HMySQL,PChar(H),PChar(U),Pchar(P),Nil,0,Nil,0);
If (HMySQL=Nil) then
MySQlError(Nil,SErrServerConnectFailed,Self);
end;
function TConnectionName.GetAsSQLText(Field : TField) : string;
var esc_str : pchar;
begin
if (not assigned(field)) or field.IsNull then Result := 'Null'
else if field.DataType = ftString then
begin
Getmem(esc_str,sizeof(field.asstring)*2+1);
mysql_real_escape_string(FMySQL,esc_str,pchar(field.asstring),length(field.asstring));
Result := '''' + esc_str + '''';
Freemem(esc_str);
end
else Result := inherited GetAsSqlText(field);
end;
function TConnectionName.GetAsSQLText(Param: TParam) : string;
var esc_str : pchar;
begin
if (not assigned(param)) or param.IsNull then Result := 'Null'
else if param.DataType = ftString then
begin
Getmem(esc_str,sizeof(param.asstring)*2+1);
mysql_real_escape_string(FMySQL,esc_str,pchar(param.asstring),length(param.asstring));
Result := '''' + esc_str + '''';
Freemem(esc_str);
end
else Result := inherited GetAsSqlText(Param);
end;
procedure TConnectionName.ConnectToServer;
Var
H,U,P : String;
begin
H:=HostName;
U:=UserName;
P:=Password;
ConnectMySQL(FMySQL,pchar(H),pchar(U),pchar(P));
FServerInfo := strpas(mysql_get_server_info(FMYSQL));
FHostInfo := strpas(mysql_get_host_info(FMYSQL));
end;
procedure TConnectionName.SelectDatabase;
begin
if mysql_select_db(FMySQL,pchar(DatabaseName))<>0 then
MySQLError(FMySQL,SErrDatabaseSelectFailed,Self);
end;
procedure TConnectionName.DoInternalConnect;
begin
FDidConnect:=(MySQLLibraryHandle=NilHandle);
if FDidConnect then
InitialiseMysql;
{$IFDEF mysql50}
if copy(strpas(mysql_get_client_info()),1,3)<>'5.0' then
Raise EInOutError.CreateFmt(SErrNotversion50,[strpas(mysql_get_client_info())]);
{$ELSE}
{$IFDEF mysql41}
if copy(strpas(mysql_get_client_info()),1,3)<>'4.1' then
Raise EInOutError.CreateFmt(SErrNotversion41,[strpas(mysql_get_client_info())]);
{$ELSE}
if copy(strpas(mysql_get_client_info()),1,3)<>'4.0' then
Raise EInOutError.CreateFmt(SErrNotversion40,[strpas(mysql_get_client_info())]);
{$ENDIF}
{$ENDIF}
inherited DoInternalConnect;
ConnectToServer;
SelectDatabase;
end;
procedure TConnectionName.DoInternalDisconnect;
begin
inherited DoInternalDisconnect;
mysql_close(FMySQL);
FMySQL:=Nil;
if FDidConnect then
ReleaseMysql;
end;
function TConnectionName.GetHandle: pointer;
begin
Result:=FMySQL;
end;
function TConnectionName.AllocateCursorHandle: TSQLCursor;
begin
Result:=TCursorName.Create;
end;
Procedure TConnectionName.DeAllocateCursorHandle(var cursor : TSQLCursor);
begin
FreeAndNil(cursor);
end;
function TConnectionName.AllocateTransactionHandle: TSQLHandle;
begin
// Result:=TTransactionName.Create;
Result := nil;
end;
procedure TConnectionName.PrepareStatement(cursor: TSQLCursor;
ATransaction: TSQLTransaction; buf: string;AParams : TParams);
begin
// if assigned(AParams) and (AParams.count > 0) then
// DatabaseError('Parameters (not) yet supported for the MySQL SqlDB connection.',self);
With Cursor as TCursorName do
begin
FStatement:=Buf;
if assigned(AParams) and (AParams.count > 0) then
FStatement := AParams.ParseSQL(FStatement,false,psSimulated,paramBinding,ParamReplaceString);
if FStatementType=stSelect then
FNeedData:=True;
ConnectMySQL(FQMySQL,FMySQL^.host,FMySQL^.user,FMySQL^.passwd);
if mysql_select_db(FQMySQL,pchar(DatabaseName))<>0 then
MySQLError(FQMySQL,SErrDatabaseSelectFailed,Self);
end
end;
procedure TConnectionName.UnPrepareStatement(cursor: TSQLCursor);
begin
With Cursor as TCursorName do
begin
mysql_close(FQMySQL);
FQMysql := nil;
end;
end;
procedure TConnectionName.FreeFldBuffers(cursor: TSQLCursor);
Var
C : TCursorName;
begin
C:=Cursor as TCursorName;
if c.FStatementType=stSelect then
c.FNeedData:=False;
if (c.FQMySQL <> Nil) then
begin
mysql_close(c.FQMySQL);
c.FQMySQL:=Nil;
end;
If (C.FRes<>Nil) then
begin
Mysql_free_result(C.FRes);
C.FRes:=Nil;
end;
end;
procedure TConnectionName.Execute(cursor: TSQLCursor;
atransaction: tSQLtransaction;AParams : TParams);
Var
C : TCursorName;
i : integer;
begin
C:=Cursor as TCursorName;
If (C.FRes=Nil) then
begin
if Assigned(AParams) and (AParams.count > 0) then
for i := 0 to AParams.count -1 do
C.FStatement := stringreplace(C.FStatement,C.ParamReplaceString+inttostr(AParams[i].Index+1),GetAsSQLText(AParams[i]),[rfReplaceAll,rfIgnoreCase]);
if mysql_query(c.FQMySQL,Pchar(C.FStatement))<>0 then
MySQLError(c.FQMYSQL,Format(SErrExecuting,[StrPas(mysql_error(c.FQMySQL))]),Self)
else
begin
C.RowsAffected := mysql_affected_rows(c.FQMYSQL);
C.LastInsertID := mysql_insert_id(c.FQMYSQL);
if C.FNeedData then
C.FRes:=mysql_use_result(c.FQMySQL);
end;
end;
end;
function TConnectionName.MySQLDataType(AType: enum_field_types; ASize, ADecimals: Integer;
var NewType: TFieldType; var NewSize: Integer): Boolean;
begin
Result := True;
case AType of
FIELD_TYPE_TINY, FIELD_TYPE_SHORT, FIELD_TYPE_LONG, FIELD_TYPE_LONGLONG,
FIELD_TYPE_INT24:
begin
NewType := ftInteger;
NewSize := 0;
end;
{$ifdef mysql50}
FIELD_TYPE_NEWDECIMAL,
{$endif}
FIELD_TYPE_DECIMAL: if ADecimals < 5 then
begin
NewType := ftBCD;
NewSize := 0;
end
else
begin
NewType := ftFloat;
NewSize := 0;
end;
FIELD_TYPE_FLOAT, FIELD_TYPE_DOUBLE:
begin
NewType := ftFloat;
NewSize := 0;
end;
FIELD_TYPE_TIMESTAMP, FIELD_TYPE_DATETIME:
begin
NewType := ftDateTime;
NewSize := 0;
end;
FIELD_TYPE_DATE:
begin
NewType := ftDate;
NewSize := 0;
end;
FIELD_TYPE_TIME:
begin
NewType := ftTime;
NewSize := 0;
end;
FIELD_TYPE_VAR_STRING, FIELD_TYPE_STRING, FIELD_TYPE_ENUM, FIELD_TYPE_SET:
begin
NewType := ftString;
NewSize := ASize;
end;
else
Result := False;
end;
end;
procedure TConnectionName.AddFieldDefs(cursor: TSQLCursor;
FieldDefs: TfieldDefs);
var
C : TCursorName;
I, FC: Integer;
field: PMYSQL_FIELD;
DFT: TFieldType;
DFS: Integer;
begin
// Writeln('MySQL: Adding fielddefs');
C:=(Cursor as TCursorName);
If (C.FRes=Nil) then
begin
// Writeln('res is nil');
MySQLError(c.FQMySQL,SErrNoQueryResult,Self);
end;
// Writeln('MySQL: have result');
FC:=mysql_num_fields(C.FRes);
For I:= 0 to FC-1 do
begin
field := mysql_fetch_field_direct(C.FRES, I);
// Writeln('MySQL: creating fielddef ',I+1);
if MySQLDataType(field^.ftype, field^.length, field^.decimals, DFT, DFS) then
TFieldDef.Create(FieldDefs, field^.name, DFT, DFS, False, I+1);
end;
// Writeln('MySQL: Finished adding fielddefs');
end;
function TConnectionName.Fetch(cursor: TSQLCursor): boolean;
Var
C : TCursorName;
begin
C:=Cursor as TCursorName;
C.Row:=MySQL_Fetch_row(C.FRes);
Result:=(C.Row<>Nil);
end;
function TConnectionName.LoadField(cursor : TSQLCursor;
FieldDef : TfieldDef;buffer : pointer) : boolean;
var
I, FC: Integer;
field: PMYSQL_FIELD;
row : MYSQL_ROW;
C : TCursorName;
begin
// Writeln('LoadFieldsFromBuffer');
C:=Cursor as TCursorName;
if C.Row=nil then
begin
// Writeln('LoadFieldsFromBuffer: row=nil');
MySQLError(c.FQMySQL,SErrFetchingData,Self);
end;
Row:=C.Row;
FC := mysql_num_fields(C.FRES);
for I := 0 to FC-1 do
begin
field := mysql_fetch_field_direct(C.FRES, I);
if field^.name=FieldDef.name then break;
Inc(Row);
end;
Result := MySQLWriteData(field^.ftype, field^.length, FieldDef.DataType, Row^, Buffer);
end;
function InternalStrToFloat(S: string): Extended;
var
I: Integer;
Tmp: string;
begin
Tmp := '';
for I := 1 to Length(S) do
begin
if not (S[I] in ['0'..'9', '+', '-', 'E', 'e']) then
Tmp := Tmp + DecimalSeparator
else
Tmp := Tmp + S[I];
end;
Result := StrToFloat(Tmp);
end;
function InternalStrToCurrency(S: string): Extended;
var
I: Integer;
Tmp: string;
begin
Tmp := '';
for I := 1 to Length(S) do
begin
if not (S[I] in ['0'..'9', '+', '-', 'E', 'e']) then
Tmp := Tmp + DecimalSeparator
else
Tmp := Tmp + S[I];
end;
Result := StrToCurr(Tmp);
end;
function InternalStrToDate(S: string): TDateTime;
var
EY, EM, ED: Word;
begin
EY := StrToInt(Copy(S,1,4));
EM := StrToInt(Copy(S,6,2));
ED := StrToInt(Copy(S,9,2));
if (EY = 0) or (EM = 0) or (ED = 0) then
Result:=0
else
Result:=EncodeDate(EY, EM, ED);
end;
function InternalStrToDateTime(S: string): TDateTime;
var
EY, EM, ED: Word;
EH, EN, ES: Word;
begin
EY := StrToInt(Copy(S, 1, 4));
EM := StrToInt(Copy(S, 6, 2));
ED := StrToInt(Copy(S, 9, 2));
EH := StrToInt(Copy(S, 12, 2));
EN := StrToInt(Copy(S, 15, 2));
ES := StrToInt(Copy(S, 18, 2));
if (EY = 0) or (EM = 0) or (ED = 0) then
Result := 0
else
Result := EncodeDate(EY, EM, ED);
Result := Result + EncodeTime(EH, EN, ES, 0);
end;
function InternalStrToTime(S: string): TDateTime;
var
EH, EM, ES: Word;
begin
EH := StrToInt(Copy(S, 1, 2));
EM := StrToInt(Copy(S, 4, 2));
ES := StrToInt(Copy(S, 7, 2));
Result := EncodeTime(EH, EM, ES, 0);
end;
function InternalStrToTimeStamp(S: string): TDateTime;
var
EY, EM, ED: Word;
EH, EN, ES: Word;
begin
{$IFNDEF mysql40}
EY := StrToInt(Copy(S, 1, 4));
EM := StrToInt(Copy(S, 6, 2));
ED := StrToInt(Copy(S, 9, 2));
EH := StrToInt(Copy(S, 12, 2));
EN := StrToInt(Copy(S, 15, 2));
ES := StrToInt(Copy(S, 18, 2));
{$ELSE}
EY := StrToInt(Copy(S, 1, 4));
EM := StrToInt(Copy(S, 5, 2));
ED := StrToInt(Copy(S, 7, 2));
EH := StrToInt(Copy(S, 9, 2));
EN := StrToInt(Copy(S, 11, 2));
ES := StrToInt(Copy(S, 13, 2));
{$ENDIF}
if (EY = 0) or (EM = 0) or (ED = 0) then
Result := 0
else
Result := EncodeDate(EY, EM, ED);
Result := Result + EncodeTime(EH, EN, ES, 0);;
end;
function TConnectionName.MySQLWriteData(AType: enum_field_types;ASize: Integer; AFieldType: TFieldType;Source, Dest: PChar): Boolean;
var
VI: Integer;
VF: Double;
VC: Currency;
VD: TDateTime;
Src : String;
begin
Result := False;
if Source = Nil then
exit;
Src:=StrPas(Source);
case AType of
FIELD_TYPE_TINY, FIELD_TYPE_SHORT, FIELD_TYPE_LONG, FIELD_TYPE_LONGLONG,
FIELD_TYPE_INT24:
begin
if (Src<>'') then
VI := StrToInt(Src)
else
VI := 0;
Move(VI, Dest^, SizeOf(Integer));
end;
{$ifdef mysql50}
FIELD_TYPE_NEWDECIMAL,
{$endif}
FIELD_TYPE_DECIMAL, FIELD_TYPE_FLOAT, FIELD_TYPE_DOUBLE:
if AFieldType = ftBCD then
begin
VC := InternalStrToCurrency(Src);
Move(VC, Dest^, SizeOf(Currency));
end
else
begin
if Src <> '' then
VF := InternalStrToFloat(Src)
else
VF := 0;
Move(VF, Dest^, SizeOf(Double));
end;
FIELD_TYPE_TIMESTAMP:
begin
if Src <> '' then
VD := InternalStrToTimeStamp(Src)
else
VD := 0;
Move(VD, Dest^, SizeOf(TDateTime));
end;
FIELD_TYPE_DATETIME:
begin
if Src <> '' then
VD := InternalStrToDateTime(Src)
else
VD := 0;
Move(VD, Dest^, SizeOf(TDateTime));
end;
FIELD_TYPE_DATE:
begin
if Src <> '' then
VD := InternalStrToDate(Src)
else
VD := 0;
Move(VD, Dest^, SizeOf(TDateTime));
end;
FIELD_TYPE_TIME:
begin
if Src <> '' then
VD := InternalStrToTime(Src)
else
VD := 0;
Move(VD, Dest^, SizeOf(TDateTime));
end;
FIELD_TYPE_VAR_STRING, FIELD_TYPE_STRING, FIELD_TYPE_ENUM, FIELD_TYPE_SET:
begin
{ Write('Moving string of size ',asize,' : ');
P:=Source;
If (P<>nil) then
While P[0]<>#0 do
begin
Write(p[0]);
inc(p);
end;
Writeln;
} if Src<> '' then
Move(Source^, Dest^, ASize)
else
Dest^ := #0;
end;
end;
Result := True;
end;
procedure TConnectionName.UpdateIndexDefs(var IndexDefs : TIndexDefs;TableName : string);
var qry : TSQLQuery;
begin
if not assigned(Transaction) then
DatabaseError(SErrConnTransactionnSet);
qry := tsqlquery.Create(nil);
qry.transaction := Transaction;
qry.database := Self;
with qry do
begin
ReadOnly := True;
sql.clear;
sql.add('show index from ' + TableName);
open;
end;
while not qry.eof do with IndexDefs.AddIndexDef do
begin
Name := trim(qry.fieldbyname('Key_name').asstring);
Fields := trim(qry.fieldbyname('Column_name').asstring);
If Name = 'PRIMARY' then options := options + [ixPrimary];
If qry.fieldbyname('Non_unique').asinteger = 0 then options := options + [ixUnique];
qry.next;
{ while (name = qry.fields[0].asstring) and (not qry.eof) do
begin
Fields := Fields + ';' + trim(qry.Fields[2].asstring);
qry.next;
end;}
end;
qry.close;
qry.free;
end;
function TConnectionName.GetTransactionHandle(trans: TSQLHandle): pointer;
begin
Result:=Nil;
end;
function TConnectionName.Commit(trans: TSQLHandle): boolean;
begin
// Do nothing.
end;
function TConnectionName.RollBack(trans: TSQLHandle): boolean;
begin
// Do nothing
end;
function TConnectionName.StartdbTransaction(trans: TSQLHandle; AParams : string): boolean;
begin
// Do nothing
end;
procedure TConnectionName.CommitRetaining(trans: TSQLHandle);
begin
// Do nothing
end;
procedure TConnectionName.RollBackRetaining(trans: TSQLHandle);
begin
// Do nothing
end;
end.
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