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DataPackageUnit.pas
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{*******************************************************}
{ }
{ 通用内存数据集控件 }
{ }
{ 功能：实现如TDataSet一样的内存数据集控制,支持Blob数据}
{*******************************************************}
//////////////////////////////////////////////////////////////////////////////////
/// ///
/// miniframe开源Web框架技术群：821855479 如果加不了群，请联系QQ：3123827806 ///
/// 网页制作器网址：https://wyeditor.com ///
/// 源码及demo下载：https://wyeditor.com/miniframe/ ///
/// ///
//////////////////////////////////////////////////////////////////////////////////
{$ifdef fpc}
{$MODE Delphi}
{$endif}
{.$INCLUDE Test.inc}
{$ifdef clientdotnet}
{$else}
unit DataPackageUnit;
interface
uses
SysUtils, Classes, db, Generics.Collections, Generics.Defaults, TypInfo{,
IdGlobalProtocols};
type
THjhMemoryDataSet = class;
TMFieldType = TFieldType{(mftUnknown, mftString, mftInteger,
mftBoolean, mftFloat, mftCurrency, mftDate, mftTime, mftDateTime,
mftBytes, mftBlob, mftWideString, mftVariant)};
PInfo = ^TInfo;
TInfo = packed record
{$IFDEF MSWINDOWS}
FieldName: string[100];
{$else}
FieldName: string;
{$ENDIF}
RecordNo: integer;
Size: integer;
end;
PSQLInfo = ^TSQLInfo;
TSQLInfo = packed record
{$IFDEF MSWINDOWS}
TableName: string[100];
{$else}
TableName: string;
{$endif}
Size: integer;
end;
TMFields = class;
EIndexOutBands = class(Exception)
public
constructor Create;reintroduce;
end;
ENotBlobError = class(Exception)
public
constructor Create;reintroduce;
end;
EBlobError = class(Exception)
public
constructor Create;reintroduce;
end;
TMField = class(TComponent)
private
FFieldName: string;
FMDataType: TMFieldType;
FCurPos: Integer;
FSlList, FTmpSL: TStringList;
FParentFields: TMFields;
function GetAsBoolean: Boolean;
function GetAsCurrency: Currency;
function GetAsDateTime: TDateTime;
function GetAsFloat: Double;
function GetAsInteger: Longint;
function GetAsString: string;
function GetAsVariant: Variant;
function GetFieldNo: Integer;
function GetIsNull: Boolean;
function GetStringValue: string;
procedure SetStringValue(Value: string);
procedure SetAsBoolean(const Value: Boolean);
procedure SetAsCurrency(const Value: Currency);
procedure SetAsDateTime(const Value: TDateTime);
procedure SetAsFloat(const Value: Double);
procedure SetAsInteger(const Value: Longint);
procedure SetAsString(const Value: string);
procedure SetAsVariant(const Value: Variant);
function GetAsDate: TDate;
function GetAsTime: TTime;
procedure SetAsDate(const Value: TDate);
procedure SetAsDTime(const Value: TTime);
function GetCommaText: string;
procedure SetCommaText(const Value: string);
function GetText: string;
procedure SetText(const Value: string);
function GetStringValueEx(CurPos: integer): string;
function BlobLoadFromFile_ToBase64(const FileName: string; var ErrStr: string): boolean;
function BlobLoadFromStream_ToBase64(Stream: TMemoryStream; var ErrStr: string): boolean;
public
function GetCommaTextEx: string;
function IndexOf(Value: string): integer;
constructor Create(AOwer: TComponent);override;
destructor Destroy; override;
procedure Clear;
function AsStringEx(Row: integer): string; //2020-08-28
function BlobLoadFromFile(const FileName: string; var ErrStr: string): boolean;
function BlobLoadFromStream(Stream: TMemoryStream; var ErrStr: string): boolean;
function BlobSaveToFile(const FileName: string; var ErrStr: string): boolean;
function BlobSaveToStream(Stream: TStream; var ErrStr: string): boolean;
published
property IsNull: Boolean read GetIsNull;
property DataType: TMFieldType read FMDataType write FMDataType;
property FieldName: string read FFieldName write FFieldName;
property ParentFields: TMFields read FParentFields write FParentFields;
property CurPos: integer read FCurPos write FCurPos default 0;
property FieldNo: Integer read GetFieldNo;
property CommaText: string read GetCommaText write SetCommaText;
property Text: string read GetText write SetText;
property AsVariant: Variant read GetAsVariant write SetAsVariant;
property AsBoolean: Boolean read GetAsBoolean write SetAsBoolean;
property AsCurrency: Currency read GetAsCurrency write SetAsCurrency;
property AsDateTime: TDateTime read GetAsDateTime write SetAsDateTime;
property AsDate: TDate read GetAsDate write SetAsDate;
property AsTime: TTime read GetAsTime write SetAsDTime;
property AsFloat: Double read GetAsFloat write SetAsFloat;
property AsInteger: Longint read GetAsInteger write SetAsInteger;
property AsString: string read GetAsString write SetAsString;
end;
TMFields = class(TObject)
private
FList: TList<TMField>;
FOwer: TComponent;
FParentMds: THjhMemoryDataSet;
function GetFieldList: string;
procedure SetFieldList(const Value: string);
protected
function GetCount: Integer;
function GetField(Index: Integer): TMField;
procedure SetField(Index: Integer; Value: TMField);
public
constructor Create(AOwer: TComponent);
destructor Destroy; override;
procedure Add(const FieldName: string; DataType: TMFieldType = ftString);
procedure Clear;
function FindField(const FieldName: string): TMField;
function FieldByName(const FieldName: string): TMField;
function FieldByNumber(FieldNo: Integer): TMField;
function IndexOf(Field: TMField): Integer;
procedure Remove(Field: TMField);
procedure Delete(FieldName: string);
{$ifdef fpc}
published
{$else}
public
{$endif}
property Fields[Index: Integer]: TMField read GetField write SetField; default;
//通过字段列表（以逗号分隔）传入，自动增加表头, 对于字段类型为数值型的要在名称后面加'*'标识
//如：CORP_ID, WZ_ID, MEAS_ID, WZM_CONVRATE*, WZM_TS //在WZM_CONVRATE后加*表示WZM_CONVRATE为数值型
published
property Count: Integer read GetCount;
property FieldList: string read GetFieldList write SetFieldList;
end;
THjhMemoryDataSet = class(TComponent)
private
FFields: TMFields;
FBof, FEof, FNeedProcessBlob, FNeedSQLScript: boolean;
FAbout: string;
FSl, SQLScriptSl: TStringList;
FTmpSL: TStringList;
FDataSet: TDataSet;
FTableName, FAliasName: string;
FHint, FDataString: string;
FBlobToBase64: boolean;
function GetRecordCount: integer;
function GetItems(index: integer): TMFields;
function GetCurRecordPos: integer;
procedure SetCurRecordPos(const Value: integer);
procedure Save;
procedure SaveSQLScript(Stream: TStream);
procedure SaveBlob(Stream: TStream);
procedure Load;
procedure LoadBlob(Stream: TStream);
procedure LoadSQLScript(Stream: TStream);
function GetRecords(index: integer; FieldName: string): Variant;
function GetCommaText: string;
function GetCommaTextEx: string;
procedure SetCommaText(const Value: string);
function GetData: OleVariant;
procedure SetData(const Value: OleVariant);
procedure MyAddField;
procedure OpenDataEx;
procedure SetBlobToBase64(const Value: boolean);
public
NeedSingleQuotes: boolean; //2018-02-26 数据添加单引号
constructor Create(AOwer: TComponent); override;
destructor Destroy; override;
procedure Clear; //清空数据和字段
procedure ClearData;//清空数据
function FieldByName(const FieldName: string): TMField; //通过字段名获取字段对象
function FindField(const FieldName: string): TMField; //通过字段名查找字段对象
function V(const FieldName: string): string; //通过字段名读取一项值，返回串
procedure S(const FieldName, Value: string); //通过字段名设置对应的值
procedure Append; //添加一行
procedure Insert;overload; //在当前位置插入一行
procedure Insert(Pos: integer);overload; //在指定位置插入一行
procedure Delete;overload; //删除当前行
procedure Delete(Pos: integer);overload; //删除指定下标的行
procedure First; //移到最前记录
procedure Prior; //移到前一记录
procedure Next; //移到下一记录
procedure Last; //移到最后记录
procedure Go(const Pos: integer); //移到指定行
function SaveToFile(const FileName: string; var ErrStr: string): boolean; //保存到文件
function SaveToStream(Stream: TStream; var ErrStr: string): boolean; //保存到流
function LoadFromFile(const FileName: string; var ErrStr: string): boolean; //从文件中加载
function LoadFromStream(Stream: TStream; var ErrStr: string): boolean; //从流中加载
procedure Open; //取字段名和数据
procedure OpenFields; //只读取字段，建表头
procedure OpenData; //只从数据集中取数据
procedure AddCurRow(MemoryStream: TMemoryStream); //添加一到mds中
procedure Post;
function IsEmpty: boolean; //判断数据集是不是空
procedure CopyOneRecord(SourMds: THjhMemoryDataset; NeedAppend: boolean = true); overload; //从SourMds复制数据集
procedure CopyOneRecord(SourCds: TDataset); overload; //从SourCds复制数据集
procedure CopyToOneRecord(TargetCds: TDataset); //把当前数据集复制到
procedure SetCommaTextEx(const Value: string);
//2022-05-12 add 通过文件后缀取适合base64的文件类型头信息
//class function GetFileMIMEType(FileName: string): string;
//class function GetFileMIMEType_Base64Head(FileName: string): string;
{$ifdef fpc}
published
{$else}
public
{$endif}
property Items[index: integer]: TMFields read GetItems; //获取指定下标的列
property Records[index: integer; FieldName: string]: Variant read GetRecords; //获取指定下标行指定的字段的值，这种方法获取多线程安全
protected
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
published
property Bof: boolean read FBof; //是否最前面
property Eof: boolean read FEof; //是否最后面
property CurRecordPos: integer read GetCurRecordPos write SetCurRecordPos; //当前行的位置
property Fields: TMFields read FFields write FFields; //字段对象集合
property RecordCount: integer read GetRecordCount; //数据集记录数
property CommaText: string read GetCommaText write SetCommaText; //将数据集转为字符串
property CommaTextEx: string read GetCommaTextEx write SetCommaText;
property Data: Olevariant read GetData write SetData; //将数据集转为Olevariant
property About: string read FAbout write FAbout;
property NeedProcessBlob: boolean read FNeedProcessBlob write FNeedProcessBlob default true; //是否需要处理Blob字段
property DataSet: TDataSet read FDataSet write FDataSet default nil; //绑定DataSet
property NeedSQLScript: boolean read FNeedSQLScript write FNeedSQLScript default false;
property AliasName: string read FAliasName write FAliasName;
property TableName: string read FTableName write FTableName;
property Hint: string read FHint write FHint;
property DataString: string read FDataString write FDataString;
property BlobToBase64: boolean read FBlobToBase64 write SetBlobToBase64; //2022-05-12 add //是否把Blob数据转Base64存贮
end;
//var
//MIMEMap: TIdMIMETable;
implementation
uses {dbtables,}PubSysUnit, Variants;
{ THjhMemoryDataSet }
function GetTableSQLScript(aTableName, aAliasName:string;
SQLIncludeIndexes: boolean = true;SQLAutoWrap:Boolean = true;
SQLSeparator:string = ''): string;
var
//Query1: TQuery ;
i:Integer ;
S,S1,DTn : String ;
Enterkey : string ;
begin
if SQLAutoWrap then Enterkey := #13#10
else Enterkey := '' ;
result := '';
{Query1:= TQuery.Create(nil);
try
Query1.Close;
Query1.SQl.Clear;
Query1.DatabaseName := aAliasName;
Query1.SQL.text := 'select FieldName=left(a.name,255) ,'
+' DataTypeName=left(b.name,255),'
+' DataLen=a.length,'
+' CanNull=columnproperty(object_id("'+aTableName+'"),a.name,"AllowsNull"),'
+' DefaultValue=(select left(text,20) from syscomments where id= a.cdefault) '
+' from syscolumns a,systypes b '
+' where a.id=object_id("'+aTableName+'") '
+' and a.xtype=b.xtype'
+' order by a.colid';
Query1.Open ;
s := 'Create Table [dbo].['+aTableName+'](' ;
While not Query1.Eof do
begin
if Pos(' ['+trim(Query1 .FieldByName('FieldName').AsString)+'] ',s) > 0 then
begin
Query1.Next;
Continue;
end;
DTn := trim(Query1.FieldByName('DataTypeName').AsString) ;
S := s +EnterKey+' ['+trim(Query1 .FieldByName('FieldName').AsString)+'] ['
+DTn+'] ';
if (Pos('char',LowerCase(DTn))>0)or(Pos('binary',LowerCase(DTn))>0) then
S := S+'('+Trim(Query1.FieldByName('DataLen').AsString)+') ';
if (pos('numeric',LowerCase(DTn))>0) then
S := S+'(5,0) ';
if Query1.FieldByName('CanNull').AsInteger = 0 then
S := S+' Not Null '
else S := S + ' Null ';
S1 := Query1.FieldByName('DefaultValue').AsString ;
i := Pos('(',s1) ;
if i>0 then
S := S + ' Default '+ S1;//Copy(s1,i+1,pos(')',s1)-i-1);hjh改为这句
S := S +' ,';
Query1.next ;
end;
S[Length(S)] := ')' ;
if SQLSeparator<>'' then S := S+Enterkey+SQLSeparator+' '+EnterKey
else S := S+EnterKey;
if SQLIncludeIndexes then
//包含索引
begin
Query1.Close;
Query1.SQL.Text :='select IndexName=left(a.name,255), '
+' ColName=left(Col_name(object_id("'+aTableName+'"),b.colid),255),'
+' IndexOrder=b.keyno,'
+' IsUnique=indexproperty(object_id("'+aTableName+'"),a.name,"IsUnique")'
+' from sysindexes a,sysindexkeys b '
+' where a.id=object_id("'+aTableName+'") and a.id=b.id '
+' and left(a.name,1)<>''_'' '
+' and a.indid=b.indid and a.used>0 '
+' order by a.name,b.colid ';
Query1.Open ;
S1 := '';
while not Query1.Eof do
begin
i := Query1.FieldByName('IsUnique').AsInteger ;
if S1<>Query1.FieldByName('IndexName').AsString then
begin
S1 := Query1.FieldByName('IndexName').AsString ;
if i=1 then
S := S +EnterKey+' Alter table '+aTableName+' add constraint '+
Query1.FieldByName('IndexName').AsString+' UNIQUE CLUSTERED ('
else
S := S +EnterKey+' Create Index '+
Query1.FieldByName('IndexName').AsString+' On '+ATableName+'(';
end;
S := S+Query1.FieldByName('ColName').AsString+',';
Query1.next ;
if Query1.Eof or(S1<>Query1.FieldByName('IndexName').AsString) then
begin
S[length(S)] := ')';
if SQLSeparator<>'' then S := S+Enterkey+SQLSeparator+' '+EnterKey
else S := S+EnterKey;
end;
end;
end;
finally
Query1.free;
end; }
Result := s;
end;
procedure THjhMemoryDataSet.Append;
var
lp: integer;
begin
for lp := 0 to Fields.Count - 1 do
begin
Fields.Fields[lp].FSlList.Add('');
Fields.Fields[lp].CurPos := Fields.Fields[lp].FSlList.Count - 1;
end;
FBof := false;
FEof := false;
end;
procedure THjhMemoryDataSet.Insert;
var
lp: integer;
begin
for lp := 0 to Fields.Count - 1 do
begin
if Fields.Fields[lp].FSlList.Count < 1 then
begin
Fields.Fields[lp].FSlList.Add('');
Fields.Fields[lp].CurPos := 0;
end else
Fields.Fields[lp].FSlList.Insert(Fields.Fields[lp].CurPos, '');
end;
FBof := false;
FEof := false;
end;
procedure THjhMemoryDataSet.Delete;
var
lp: integer;
begin
if RecordCount < 1 then exit;
for lp := 0 to Fields.Count - 1 do
begin
Fields.Fields[lp].FSlList.Delete(Fields.Fields[lp].CurPos);
if Fields.Fields[lp].CurPos > Fields.Fields[lp].FSlList.Count - 1 then
Fields.Fields[lp].CurPos := Fields.Fields[lp].CurPos - 1;
if Fields.Fields[lp].FSlList.Count = 0 then Fields.Fields[lp].CurPos := -1;
end;
if Fields.Count > 0 then
if Fields.Fields[0].CurPos < 1 then
FBof := true;
if (Fields.Fields[0].CurPos < 1)and(RecordCount < 1) then
FEof := true;
if Fields.Count > 0 then
if Fields.Fields[0].CurPos >= Fields.Count - 1 then
FEof := true;
end;
procedure THjhMemoryDataSet.Clear;
begin
FBof := true;
FEof := true;
CurRecordPos := -1;
Fields.Clear;
ClearData;
end;
constructor THjhMemoryDataSet.Create(AOwer: TComponent);
begin
inherited Create(AOwer);
FBlobToBase64 := false;
//{$ifdef XE10}
//NeedSingleQuotes := true; //2018-02-26 add
//{$ELSE}
NeedSingleQuotes := false; //2018-02-26 add
//{$ENDIF}
FFields := TMFields.Create(AOwer);
FFields.FParentMds := Self;
FHint := '';
FDataString := '';
FBof := true;
FEof := true;
FNeedProcessBlob := true;
FNeedSQLScript := false;
FDataSet := nil;
FTmpSL := TStringList.Create;
end;
destructor THjhMemoryDataSet.Destroy;
begin
if not Assigned(Self) then exit;
FFields.Clear;
FFields.Free;
if Assigned(FSl) then
FSl.Free;
if Assigned(SQLScriptSl) then
SQLScriptSl.Free;
FTmpSL.Free;
inherited;
end;
function THjhMemoryDataSet.FieldByName(const FieldName: string): TMField;
begin
Result := FindField(FieldName);
if Result = nil then raise Exception.Create(Name + '不存在的字段名['+FieldName+']');
end;
function THjhMemoryDataSet.FindField(const FieldName: string): TMField;
begin
Result := FFields.FindField(FieldName);
end;
function THjhMemoryDataSet.GetRecordCount: integer;
begin
Result := -1;
if FFields.Count < 1 then exit;
//hjh mod Result := TMField(FFields.FList.Items[0]).FSlList.Count;
Result := TMField(FFields.FList[0]).FSlList.Count;
end;
procedure THjhMemoryDataSet.First;
var
lp: integer;
begin
if RecordCount < 1 then
begin
FBof := true;
FEof := true;
exit;
end;
for lp := 0 to FFields.Count - 1 do
FFields.Fields[lp].CurPos := 0;
if RecordCount < 1 then
begin
FBof := true;
FEof := true;
end else
begin
FBof := false;
FEof := false;
end;
end;
procedure THjhMemoryDataSet.Last;
var
lp: integer;
begin
if RecordCount < 1 then exit;
for lp := 0 to FFields.Count - 1 do
FFields.Fields[lp].CurPos := FFields.Fields[lp].FSlList.Count - 1;
if RecordCount < 1 then
begin
FBof := true;
FEof := true;
end else
begin
FBof := false;
FEof := false;
end;
end;
procedure THjhMemoryDataSet.Next;
var
lp: integer;
begin
if RecordCount < 1 then
begin
FEof := true;
exit;
end;
FBof := false;
if Fields.Fields[0].CurPos = FFields.Fields[0].FSlList.Count - 1 then
FEof := true;
for lp := 0 to FFields.Count - 1 do
begin
FFields.Fields[lp].CurPos := FFields.Fields[lp].CurPos + 1;
if FFields.Fields[lp].CurPos > FFields.Fields[lp].FSlList.Count - 1 then
FFields.Fields[lp].CurPos := FFields.Fields[lp].FSlList.Count - 1;
end;
end;
procedure THjhMemoryDataSet.Prior;
var
lp: integer;
begin
if RecordCount < 1 then exit;
if Fields.Count > 0 then
FEof := false;
if Fields.Fields[0].CurPos = 0 then
FBof := true;
for lp := 0 to FFields.Count - 1 do
begin
FFields.Fields[lp].CurPos := FFields.Fields[lp].CurPos - 1;
if FFields.Fields[lp].CurPos < 0 then FFields.Fields[lp].CurPos := 0;
end;
end;
function THjhMemoryDataSet.GetItems(index: integer): TMFields;
var
lp: integer;
begin
Result := FFields;
for lp := 0 to Result.Count - 1 do
TMField(Result.Fields[lp]).CurPos := index;
end;
function THjhMemoryDataSet.GetCurRecordPos: integer;
begin
Result := -1;
if FFields.Count < 1 then exit;
Result := FFields.Fields[0].CurPos;
end;
procedure THjhMemoryDataSet.SetCurRecordPos(const Value: integer);
var
lp: integer;
begin
for lp := 0 to FFields.Count - 1 do
FFields.Fields[lp].CurPos := Value;
end;
procedure THjhMemoryDataSet.Delete(Pos: integer);
begin
CurRecordPos := Pos;
Delete;
end;
procedure THjhMemoryDataSet.Insert(Pos: integer);
begin
CurRecordPos := Pos;
Insert;
end;
procedure THjhMemoryDataSet.Go(const Pos: integer);
begin
CurRecordPos := Pos;
end;
procedure THjhMemoryDataSet.S(const FieldName, Value: string);
var
Field: TMField;
begin
Field := FindField(FieldName);
if Field <> nil then Field.AsString := Value;
end;
procedure THjhMemoryDataSet.Save;
var
pt: PTypeInfo;
function RepaceType(FieldType: TMFieldType):string;
begin
Result := '';
pt := TypeInfo(TMFieldType);
Result := GetEnumName(pt, Ord(FieldType));
{case FieldType of
mftUnknown: Result := 'mftUnknown';
mftString: Result := 'mftString';
mftInteger: Result := 'mftInteger';
mftBoolean: Result := 'mftBoolean';
mftFloat: Result := 'mftFloat';
mftCurrency: Result := 'mftCurrency';
mftDate: Result := 'mftDate';
mftTime: Result := 'mftTime';
mftDateTime: Result := 'mftDateTime';
mftBytes: Result := 'mftBytes';
mftBlob: Result := 'mftBlob';
mftWideString: Result := 'mftWideString';
mftVariant: Result := 'mftVariant';
end;}
end;
procedure MySaveField;
var
i: integer;
tmpStr: string;
begin
tmpStr := '';
for i := 0 to FFields.Count - 1 do
tmpStr := tmpStr + #2 + FFields.Fields[i].FieldName + #2 +
RepaceType(FFields.Fields[i].DataType);
if Length(tmpStr) > 1 then
System.Delete(tmpStr,1,1);
FSl.Add(tmpStr);
end;
procedure MySaveData;
var
i, k: integer;
SL, SL2: TStringList;
begin
SL := TStringList.Create;
try
SL2 := TStringList.Create;
try
for i := 0 to RecordCount - 1 do
begin
SL.Clear;
for k := 0 to FFields.Count - 1 do
begin
SL2.Text := Items[i].Fields[k].AsString;
SL.Add(SL2.CommaText);
end;
FSl.Add(SL.CommaText);
end;
finally
SL2.Free;
end;
finally
SL.Free;
end;
end;
begin
if not Assigned(FSl) then FSl := TStringList.Create
else FSl.Clear;
MySaveField;
MySaveData;
end;
procedure THjhMemoryDataSet.Load;
var
TmpSl: TStringList;
function RepaceType(FieldType: string): TMFieldType;
var
pt: PTypeInfo;
p: PTypeData;
I: integer;
begin
Result := ftString;
pt := TypeInfo(TMFieldType);
FieldType := trim(FieldType);
Result := ftString;
p := GetTypeData(TypeInfo(TMFieldType));
for I := p.MinValue to p.MaxValue do
if LowerCase(GetEnumName(pt,I)) = LowerCase(trim(FieldType)) then
begin
Result := TMFieldType(I);
break;
end;
{ //2022-05-11 add
if FieldType = 'mftUnknown' then Result := mftUnknown else
if FieldType = 'mftString' then Result := mftString else
if FieldType = 'mftInteger' then Result := mftInteger else
if FieldType = 'mftBoolean' then Result := mftBoolean else
if FieldType = 'mftFloat' then Result := mftFloat else
if FieldType = 'mftCurrency'then Result := mftCurrency else
if FieldType = 'mftDate' then Result := mftDate else
if FieldType = 'mftTime' then Result := mftTime else
if FieldType = 'mftDateTime'then Result := mftDateTime else
if FieldType = 'mftBytes' then Result := mftBytes else
if FieldType = 'mftBlob' then Result := mftBlob else
if FieldType = 'mftWideString' then Result := mftWideString else
if FieldType = 'mftVariant' then Result := mftVariant else
Result := mftString;}
end;
procedure MyLoadField;
var
TmpStr, Oth: string;
i: integer;
begin
TmpStr := FSl[0];
TmpStr := trim(TmpStr);
if TmpStr = '' then exit;
for i := 1 to length(TmpStr) do
if TmpStr[i] = #2 then TmpStr[i] := #13;
TmpSl.Text := TmpStr;
FFields.Clear;
for i := 0 to TmpSl.Count div 2 - 1 do
begin
if Pos(',' + TmpSl[2*i] + ',', Oth) < 1 then //2022-05-07 add 过滤
FFields.Add(TmpSl[2*i], RepaceType(TmpSl[2*i + 1]));
Oth := Oth + ',' + TmpSl[2*i] + ','; //2022-05-07 add 过滤
end;
end;
procedure MyLoadData;
var
i, j: integer;
TmpSl2: TStringlist;
begin
TmpSl2 := TStringlist.Create;
try
for i := 1 to FSl.Count - 1 do
begin
TmpSl.Clear;
TmpSl.CommaText := FSl[i];
Append;
//2022-05-17 mod for j := 0 to TmpSl.Count - 1 do
for j := 0 to FFields.Count - 1 do
begin
try
TmpSl2.CommaText := TmpSl[j];
//2017-11-09 mod FieldByName(FFields.Fields[j].FieldName).SetStringValue(TmpSl2.Text);
FieldByName(FFields.Fields[j].FieldName).SetStringValue(trim(TmpSl2.Text));
except
end;
end;
end;
finally
TmpSl2.Free;
end;
end;
begin
//{$ifdef XE10}
//NeedSingleQuotes := true; //2018-02-26 add
//{$ELSE}
NeedSingleQuotes := false; //2018-02-26 add
//{$ENDIF}
if (not Assigned(FSl)) or (FSl.Count < 1) then exit;
TmpSl := TStringList.Create;
try
MyLoadField;
MyLoadData;
finally
TmpSl.Free;
end;
end;
procedure THjhMemoryDataSet.SaveBlob(Stream: TStream);
var
Info: PInfo;
lp, Size: integer;
procedure SaveOneColBlob;
var
i: integer;
Ms: TMemoryStream;
begin
Size := SizeOf(TInfo);
Info^.FieldName := FFields.Fields[lp].FieldName;
for i := 0 to RecordCount - 1 do
begin
if trim(Items[i].FieldByName(Info^.FieldName).AsString) <> '' then
begin
Info^.RecordNo := i;
Ms := TMemoryStream(Items[i].FieldByName(Info^.FieldName).AsInteger);
Info^.Size := Ms.Size;
Stream.WriteBuffer(Info^, Size);
Ms.Position := 0;
//2010-02-02 mod Stream.CopyFrom(Ms, Info^.Size);
Stream.WriteBuffer(Ms.Memory^, Info^.Size);
end;
end;
end;
begin
New(Info);
try
for lp := 0 to FFields.Count - 1 do
begin
if FFields.Fields[lp].DataType = ftBlob then
begin
SaveOneColBlob;
end;
end;
finally
Dispose(PInfo(Info));
end;
end;
procedure THjhMemoryDataSet.SaveSQLScript(Stream: TStream);
var
SQLInfo: PSQLInfo;
Size: integer;
MemoryStream: TMemoryStream;
begin
New(SQLInfo);
try
Size := SizeOf(TSQLInfo);
SQLInfo^.TableName := '';
SQLInfo^.Size := 0;
if not (FNeedSQLScript and Assigned(SQLScriptSl)) then
begin
Stream.WriteBuffer(SQLInfo^, Size);
end else
begin
SQLInfo^.TableName := FTableName;
MemoryStream := TMemoryStream.Create;
try
SQLScriptSl.SaveToStream(MemoryStream);
SQLInfo^.Size := MemoryStream.Size;
SQLInfo^.TableName := FTableName;
Stream.WriteBuffer(SQLInfo^, Size);
MemoryStream.Position := 0;
Stream.CopyFrom(MemoryStream, SQLInfo^.Size);
finally
MemoryStream.Free;
end;
end;
finally
Dispose(PSQLInfo(SQLInfo));
end;
end;
function THjhMemoryDataSet.SaveToFile(const FileName: string; var ErrStr: string): boolean;
var
FileStream: TFileStream;
MemoryStream: TMemoryStream;
aSize: integer;
begin
//if Encoding = nil then Encoding := TEncoding.UTF8; //2020-08-23 add
Result := false;
try
Save;
if not FNeedProcessBlob then
FSl.SaveToFile(FileName, TEncoding.UTF8)
else begin
FileStream := TFileStream.Create(FileName, fmCreate);
try
MemoryStream := TMemoryStream.Create;
try
FSl.SaveToStream(MemoryStream, TEncoding.UTF8);
aSize := MemoryStream.Size;
FileStream.Write(aSize, SizeOf(aSize));
MemoryStream.Position := 0;
FileStream.CopyFrom(MemoryStream, aSize);
SaveSQLScript(FileStream);
if not BlobToBase64 then
SaveBlob(FileStream);
finally
MemoryStream.Free;
end;
finally
FileStream.Free;
end;
end;
except
on e: exception do
begin
ErrStr := e.Message;
exit;
end;
end;
Result := true;
end;
function THjhMemoryDataSet.SaveToStream(Stream: TStream; var ErrStr: string): boolean;
var
MemoryStream: TMemoryStream;
aSize: integer;
begin
Result := false;
try
Save;
if not FNeedProcessBlob then
FSl.SaveToStream(Stream)
else
begin
MemoryStream := TMemoryStream.Create;
try
FSl.SaveToStream(MemoryStream);
aSize := MemoryStream.Size;
Stream.Write(aSize, SizeOf(aSize));
MemoryStream.Position := 0;
//2010-02-02 mod Stream.CopyFrom(MemoryStream, aSize);
Stream.WriteBuffer(MemoryStream.Memory^, aSize);
SaveSQLScript(Stream);
SaveBlob(Stream);
finally
MemoryStream.Free;
end;
end;
except
on e: exception do
begin
ErrStr := e.Message;
exit;
end;
end;
Result := true;
end;
procedure THjhMemoryDataSet.LoadBlob(Stream: TStream);
var
Info: PInfo;
Size: integer;
MemoryStream: TMemoryStream;
begin
if Stream.Position >= Stream.Size then exit;
New(Info);
try
Size := SizeOf(TInfo);
while Stream.Position < Stream.Size do
begin
FillChar(Info^, Size, 0);
Stream.ReadBuffer(Info^, Size);
MemoryStream := TMemoryStream.Create;
if Info^.Size > 0 then
begin
//2010-02-02 mod
//MemoryStream.CopyFrom(Stream, Info^.Size);
MemoryStream.Size := Info^.Size;
Stream.ReadBuffer(MemoryStream.Memory^, Info^.Size);
Items[Info^.RecordNo].FieldByName(Info^.FieldName).
SetStringValue(IntToStr(LongInt(MemoryStream)));
end;
end;
finally
Dispose(PInfo(Info));
end;
end;