{"id":112,"date":"2003-05-30T15:47:00","date_gmt":"2003-05-30T07:47:00","guid":{"rendered":"http:\/\/www.freemindworld.com\/blog\/2003\/05\/0530_delphi%e4%b8%ad%e4%b8%a4%e4%b8%aabug%e7%9a%84%e5%88%86%e6%9e%90%e4%b8%8e%e4%bf%ae%e5%a4%8d.shtml"},"modified":"2012-01-30T17:06:37","modified_gmt":"2012-01-30T09:06:37","slug":"030530_two_bugs_in_delphi","status":"publish","type":"post","link":"https:\/\/www.freemindworld.com\/blog\/2003\/030530_two_bugs_in_delphi.shtml","title":{"rendered":"Delphi\u4e2d\u4e24\u4e2aBUG\u7684\u5206\u6790\u4e0e\u4fee\u590d"},"content":{"rendered":"

Delphi\u4e2d\u4e24\u4e2aBUG\u7684\u5206\u6790\u4e0e\u4fee\u590d<\/strong><\/span><\/p>\n

\u3000\u3000\u5728\u4f7f\u7528Delphi 7\u8fdb\u884c\u4e09\u5c42\u6570\u636e\u5e93\u5f00\u53d1\u65f6\uff0c\u9047\u5230\u4e86\u4e24\u4e2a\u5c0f\u95ee\u9898\uff0c\u901a\u8fc7\u53cd\u590d\u8bd5\u9a8c\uff0c\u7ec8\u4e8e\u627e\u51fa\u4e86Delphi 7\u4e2d\u7684\u4e24\u4e2a\u5c0fBUG\u5e76\u8fdb\u884c\u4e86\u4fee\u590d\uff08\u597d\u50cfDelphi 6\u4e2d\u4e5f\u6709\u76f8\u540c\u7684BUG\uff09\uff0c\u64b0\u5199\u6b64\u6587\u4e0e\u5927\u5bb6\u4e00\u8d77\u5206\u4eab\u6210\u529f\u7684\u559c\u60a6\u3002\u6211\u4e5f\u662f\u521d\u5b66Delphi\uff0c\u6587\u4e2d\u4e00\u5b9a\u5b58\u5728\u4e0d\u5c11\u8bf4\u7684\u4e0d\u5bf9\u7684\u5730\u65b9\uff0c\u8fd8\u8bf7\u5404\u4f4d\u670b\u53cb\u591a\u591a\u6307\u6b63\u3002<\/span><\/p>\n

\u3000\u3000BUG1.\u4f20\u53c2\u65f6\u4e2d\u6587\u88ab\u622a\u65ad\u7684\u95ee\u9898\uff1a<\/strong><\/span><\/span><\/p>\n

\u3000\u3000BUG\u518d\u73b0\u7684\u65b9\u6cd5\uff1a<\/strong><\/em><\/span><\/p>\n

\u3000\u3000\u540e\u53f0\u7528SQL Server 2000\uff0c\u91cc\u9762\u6709\u4e00\u4e2aXsHeTong\u8868\u7528\u4e8e\u8bd5\u9a8c\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u60a8\u7684\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u8c03\u6574\u3002<\/span><\/p>\n

\u3000\u3000\u5148\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u670d\u52a1\u5668\uff1a\u65b0\u5efa\u9879\u76ee\uff0c\u521b\u5efa\u4e00\u4e2a\u8fdc\u7a0b\u6570\u636e\u6a21\u5757\uff0c\u4e0a\u9762\u653e\u7f6e ADOConnection\u3001ADODataSet\u3001DataSetProvider\u5404\u4e00\uff0c\u5e76\u505a\u597d\u76f8\u5e94\u8bbe\u7f6e\uff0c\u5176\u4e2dADODataSet\u7684 ComamndText\u7559\u7a7a\uff0c\u5e76\u628a\u5b83\u7684Option\u4e2d\u7684poAllowCommandText\u8bbe\u7f6e\u4e3aTrue\u3002\u7f16\u8bd1\u8fd0\u884c\u3002<\/span><\/p>\n

\u3000\u3000\u518d\u521b\u5efa\u5ba2\u6237\u7aef\u7a0b\u5e8f\uff1a\u65b0\u5efa\u9879\u76ee\uff0c\u5728\u7a97\u4f53\u4e0a\u653e\u7f6eDCOMConnection\uff0c \u8fde\u4e0a\u524d\u9762\u4e0a\u521b\u5efa\u7684\u6570\u636e\u670d\u52a1\u5668\uff0c\u518d\u653e\u7f6e\u4e00\u4e2aClientDataSet\uff0c\u628a\u5b83\u7684\u8fde\u63a5\u8bbe\u6210\u8fd9\u91cc\u7684DCOMConnection\uff0c\u5e76\u8bbe\u7f6e\u5b83\u7684 ProviderName\u4e3a\u4e0a\u9762\u7684\u670d\u52a1\u5668\u4e0a\u7684DataSetProvider\u7684\u540d\u5b57\u3002\u6700\u540e\u653e\u7f6eDataSource\u548cDBGrid\u5404\u4e00\u5e76\u4f5c\u76f8\u5e94\u8bbe\u7f6e\u7528\u4e8e\u67e5 \u770b\u7ed3\u679c\uff0c\u518d\u653e\u7f6e\u4e00Button\u7528\u4e8e\u6d4b\u8bd5\u3002<\/span><\/p>\n

\u3000\u3000\u5728Button\u7684OnClick\u4e2d\u5199\u4e0b\u7c7b\u4f3c\u4e8e\u4e0b\u9762\u7684\u4ee3\u7801\uff08\u8fd9\u91cc\u6211\u7528\u4e86XsHeTong\u7684\u8868\u548c\u5b83\u7684\u4e24\u4e2a\u5b57\u6bb5HTH\uff08char 15\uff09\u3001GCMC\uff08varchar 100\uff09\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u4f60\u7684\u5b9e\u9645\u6d4b\u8bd5\u60c5\u51b5\u8fdb\u884c\u8c03\u6574\uff09\uff1a<\/span><\/p>\n

\u3000\u3000with ClientDataSet1 do
\nbegin
\nClose;
\nCommandText := ‘Insert Into XsHeTong(HTH, GCMC) values(:HTH,:GCMC)’;
\nParams[0].AsString := ‘12345’;
\nParams[1].AsString := ‘\u4f1a\u622a\u65ad\u7684\u4e2d\u6587\u5b57’;
\nExecute;
\nClose;
\nCommandText := ‘Select * from XsHeTong’;
\nOpen;
\nend;<\/span><\/p>\n

\u3000\u3000\u8fd0\u884c\u7a0b\u5e8f\uff0c\u70b9\u51fb\u6309\u94ae\uff0c\u770b\u5230\u8bb0\u5f55\u88ab\u63d2\u5165\u4e86\uff0c\u53ef\u60dc\u7ed3\u679c\u5e76\u4e0d\u6b63\u786e\uff0c\u201c\u4f1a\u622a\u65ad\u7684\u4e2d\u6587\u5b57\u201d\u53d8\u6210\u4e86\u201c\u4f1a\u622a\u65ad\u201d\uff0c\u4f46\u6ca1\u6709\u4e2d\u6587\u7684\u201c12345\u201d\u5012\u662f\u6b63\u786e\u7684\u63d2\u5165\u4e86\u3002<\/span><\/p>\n

\u3000\u3000BUG\u5206\u6790\u4e0e\u4fee\u590d\uff1a<\/em><\/strong><\/span><\/p>\n

\u3000\u3000\u4e3a\u4e86\u5bf9\u7167\u8d77\u89c1\uff0c\u6211\u8bd5\u7740\u76f4\u63a5\u7528\u4e00\u4e2aADOConnection\u548cADOCommand\u3001ADOTable\u8fdb\u884cC\/S\u6784\u67b6\u6d4b\u8bd5\uff0c\u7ed3\u679c\u662f\u6b63\u786e\u7684\uff0c\u4e2d\u6587\u5b57\u4e0d\u4f1a\u88ab\u5207\u65ad\u3002\u8fd9\u8bf4\u660e\u4e86\u6b64BUG\u53ea\u5728\u4e09\u5c42\u6784\u67b6\u4e0a\u51fa\u73b0\u3002<\/span><\/p>\n

\u3000\u3000 \u7528SQL Server\u4e8b\u4ef6\u63a2\u67e5\u5668\u63a2\u67e5\u63d0\u4ea4\u5230SQL Server\u4e0a\u8fd0\u884c\u7684\u8bed\u53e5\uff0c\u53d1\u73b0\u4e24\u5c42\u6784\u67b6\u4e0e\u4e09\u5c42\u6784\u67b6\u7684\u60c5\u51b5\u6709\u4ee5\u4e0b\u4e0d\u540c\uff1a<\/span><\/p>\n

\u3000\u3000\u4e24\u5c42\u6784\u67b6\uff1a
\nexec sp_executesql N’Insert into XsHeTong(HTH, GCMC) values(@P1,@P2)’, N’@P1 varchar(15),@P2 varchar(100)’, ‘12345’, ‘\u4f1a\u622a\u65ad\u7684\u4e2d\u6587\u5b57’<\/span><\/p>\n

\u3000\u3000\u4e09\u5c42\u6784\u67b6\uff1a
\n<\/span>\u3000\u3000exec sp_executesql N’Insert into XsHeTong(HTH, GCMC) values(@P1,@P2)’, N’@P1 varchar(5),@P2 varchar(7)’, ‘12345’, ‘\u4f1a\u622a\u65ad<\/span><\/p>\n

\u3000\u3000\u663e\u7136\uff0c\u4e24\u5c42\u6784\u67b6\u65f6\uff0c\u53c2\u6570\u7684\u957f\u5ea6\u662f\u6309\u5b9e\u9645\u5e93\u7ed3\u6784\u4f20\u7684\uff0c\u4e09\u5c42\u6784\u67b6\u65f6\uff0c\u53c2\u6570\u957f\u5ea6\u662f\u6309\u5b9e\u9645\u53c2\u6570\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\u4f20\u7684\uff0c\u800c\u5b9e\u9645\u5b57\u7b26\u4e32\u957f\u5ea6\u53c8\u4f3c\u4e4e\u662f\u7b97\u9519\u4e86\uff0c\u6ca1\u6709\u628a\u4e00\u4e2a\u4e2d\u6587\u5f53\u4e24\u4e2a\u5b57\u7b26\u957f\u5ea6\u5904\u7406\u3002<\/span><\/p>\n

\u3000\u3000\u6ca1\u6709\u529e\u6cd5\u53ea\u597d\u8fdb\u884c\u8ddf\u8e2a\u8c03\u8bd5\uff0c\u4e3a\u4e86\u8c03\u8bd5Delphi\u7684VCL\u5e93\uff0c\u9700\u8981\u5728\u5de5\u7a0b\u9009\u9879\u7684\u201cCompiler Options\u201d\u4e2d\u9009\u4e0a\u201cUse Debug DCUs\u201d\u3002<\/span><\/p>\n

\u3000\u3000\u5148\u8ddf\u8e2a\u5ba2\u6237\u7aef\u7a0b\u5e8f\uff0cClientDataSet1.Execute\u540e\uff0c\u5148\u540e \u7ecf\u5386\u4e86TCustomClientDataSet.Exectue\u3001TCustomeClientDataSet.PackageParams\u3001 TCustomClientDataSet.DoExecute\u7b49\u4e00\u7cfb\u5217\u51fd\u6570\uff0c\u4e00\u76f4\u5230 AppServer.AS_Execute(ProviderName, CommandText, Params, OwnerData); \u628a\u8bf7\u6c42\u63d0\u4ea4\u5230\u670d\u52a1\u5668\u5747\u6ca1\u6709\u4ec0\u4e48\u5f02\u5e38\u60c5\u51b5\uff0c\u770b\u6765\u95ee\u9898\u51fa\u5728\u670d\u52a1\u5668\u7aef\u3002<\/span><\/p>\n

\u3000\u3000\u5bf9\u670d\u52a1\u5668\u8fdb\u884c\u8ddf\u8e2a\uff0c\u53cd\u590d\u8bd5\u9a8c\u540e\uff0c\u6211\u628a\u91cd\u70b9\u843d\u5728\u4e86 TCustomADODataSet.PSSetCommandText\u51fd\u6570\u8eab\u4e0a\uff0c\u7ecf\u8fc7\u53cd\u590d\u7ec6\u81f4\u7684\u8ddf\u8e2a\uff0c\u76ee\u6807\u8d8a\u6765\u8d8a\u7cbe \u786e\uff1aTCustomADODataSet.PSSetParams\u3001TParameter.Assign\u3001TParameter.SetValue\u3001 VarDataSize\u3002\u7ec8\u4e8e\u627e\u5230\u4e86BUG\u7684\u6e90\u5934\uff1aVarDataSize\u51fd\u6570\uff0c\u4e0b\u9762\u662f\u5b83\u7684\u4ee3\u7801\uff1a<\/span><\/p>\n

\u3000\u3000function VarDataSize(const Value: OleVariant): Integer;
\nbegin
\nif VarIsNull(Value) then
\nResult := -1
\nelse if VarIsArray(Value) then
\nResult := VarArrayHighBound(Value, 1) + 1
\nelse if TVarData(Value).VType = varOleStr then
\nbegin
\nResult := Length(PWideString(@TVarData(Value).VOleStr)^); \/\/\u51fa\u95ee\u9898\u7684\u884c
\nif Result = 0 then
\nResult := -1;
\nend
\nelse
\nResult := SizeOf(OleVariant);
\nend;<\/span><\/p>\n

\u3000\u3000\u5c31\u662f\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u8ba1\u7b97\u5b9e\u53c2\u7684\u957f\u5ea6\u7684\uff0c\u5b83\u628aValue\u4e2d\u7684\u503c\u53d6\u51fa\u5730\u5740\uff0c\u5e76\u628a\u5b83\u4f5c\u4e3a\u4e00\u4e2aWideString\u7684\u6307\u9488\u53bb\u6c42\u5b57\u7b26\u4e32\u957f\u5ea6\uff0c\u7ed3\u679c\u5c31\u5bfc\u81f4\u4e86\u201c\u4f1a\u622a\u65ad\u7684\u4e2d\u6587\u5b57\u201d\u8fd9\u4e2a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u53d8\u6210\u4e867\uff0c\u800c\u4e0d\u662f14\u3002<\/span><\/p>\n

\u3000\u3000\u95ee\u9898\u627e\u5230\u4e86\uff0c\u89e3\u51b3\u8d77\u6765\u4e5f\u5c31\u4e0d\u56f0\u96be\u4e86\uff0c\u53ea\u8981\u7b80\u5355\u7684\u628a
\nResult := Length(PWideString(@TVarData(Value).VOleStr)^); \/\/\u51fa\u95ee\u9898\u7684\u884c
\n\u6539\u6210
\nResult := Length(PAnsiString(@TVarData(Value).VOleStr)^); \/\/\u6ca1\u95ee\u9898\u4e86
\n\u5c31\u53ef\u4ee5\u4e86\u3002<\/span><\/p>\n

\u3000\u3000\u4f46\u662f\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4\u6c42\u82f1\u6587\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u65f6\u957f\u5ea6\u88ab\u52a0\u500d\u4e86\uff0c\u6240\u4ee5\u4e5f\u53ef\u4ee5\u628a\u8fd9\u4e00\u884c\u6539\u6210\uff1a
\nResult := Length(Value); <\/span><\/p>\n

\u3000\u3000\u8fd9\u6837\uff0c\u4e0d\u7ba1\u662f\u4e2d\u6587\u8fd8\u662f\u82f1\u6587\u8fd8\u662f\u4e2d\u82f1\u6df7\u5408\u7684\u5b57\u7b26\u4e32\u5c31\u90fd\u53ef\u6c42\u5f97\u6b63\u786e\u7684\u957f\u5ea6\u4e86\u3002\u8fd9\u5c31\u6211\u81f3\u4eca\u4ecd\u767e\u601d\u4e0d\u89e3\u7684\u95ee\u9898\uff0c\u4e3a\u4ec0\u4e48Borland\u8981\u7ed5\u4e2a\u5708\u5b50\u901a\u8fc7\u6307\u9488\u53bb\u6c42\u53c2\u6570\u503c\u7684\u957f\u5ea6\u5462\uff1f\u54ea\u4f4d\u670b\u53cb\u77e5\u9053\u7684\u8bdd\u8fd8\u8bf7\u7ed9\u6211\u89e3\u91ca\u4e00\u4e0b\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/span><\/p>\n

\u3000\u3000\u6709\u4e9b\u670b\u53cb\u53ef\u80fd\u4f1a\u6709\u7591\u95ee\uff0c\u4e3a\u4ec0\u4e48\u5728\u4e0d\u901a\u8fc7\u4e09\u5c42\u6784\u67b6\u6765\u505a\u7684\u65f6\u5019\u4e0d\u4ea7\u751f\u8fd9\u4e2a\u5b57\u7b26\u4e32\u88ab\u622a\u65ad\u7684\u95ee\u9898\u5462\uff1f\u7b54\u6848\u5e76\u4e0d\u590d\u6742\uff0c\u5728\u76f4\u63a5\u901a\u8fc7ADOCommand\u6765\u5411SQL Server\u53d1\u9001\u547d\u4ee4\u65f6\uff0c\u5b83\u662f\u6309\u8868\u7ed3\u6784\u6765\u51b3\u5b9a\u53c2\u6570\u957f\u5ea6\u7684\u3002\u5b83\u4f1a\u5148\u5411SQL Server\u53d1\u4e00\u6761<\/span><\/p>\n

\u3000\u3000SET FMTONLY ON select HTH,GCMC from XsHeTong SET FMTONLY OFF<\/span><\/p>\n

\u3000\u3000\u6765\u83b7\u53d6\u8868\u7ed3\u6784\u3002\u800c\u5728\u4e09\u5c42\u6784\u67b6\u4e0b\uff0cTCustomADODataSet\u5185\u90e8\u867d\u7136\u4e5f\u662f\u7528TADOCommand\u5bf9\u8c61\u6765\u53d1\u547d\u4ee4\uff0c\u4f46\u5b83\u5374\u5728\u53d6\u5f97\u8868\u7ed3\u6784\u7684\u540e\uff0c\u5e76\u4e0d\u7528\u8fd9\u4e2a\u503c\u6765\u4f5c\u4e3a\u4f20\u53c2\u957f\u5ea6\uff0c\u800c\u662f\u91cd\u65b0\u53bb\u6309\u5b9e\u9645\u53c2\u6570\u6765\u8ba1\u7b97\u957f\u5ea6\uff0c\u7ed3\u679c\u5c31\u5bfc\u81f4\u4e86\u9519\u8bef\u3002<\/span><\/p>\n

\n

\u3000\u3000BUG2.ClientDataSet\u7684Lookup\u5b57\u6bb5\u7684\u95ee\u9898\uff1a<\/span><\/strong><\/span><\/p>\n

\u3000\u3000BUG\u518d\u73b0\u7684\u65b9\u6cd5\uff1a<\/em><\/strong><\/span><\/p>\n

\u3000\u3000\u65b0\u5efa\u5de5\u7a0b\uff0c\u5728\u4e0a\u9762\u653e\u7f6e\u4e24\u4e2aClientDataSet\uff0c\u5206\u522b\u4e3acds1\u548ccds2\uff0c\u5b83\u7684\u6570\u636e\u6765\u6e90\u4efb\u610f\uff0c\u5176\u4e2dcds1\u4e3a\u4e3b\u6570\u636e\u96c6\uff0c\u5728\u91cc\u9762\u589e\u52a0\u4e00\u4e2a\u65b0\u7684Lookup\u5b57\u6bb5\uff0c\u8fd9\u4e2aLookup\u5b57\u6bb5\u6839\u636ecds1\u4e2d\u7684\u4e00\u4e2a\u5b57\u7b26\u578b\u7684\u5b57\u6bb5\u503c\u5230cds2\u4e2d\u627e\u51fa\u5bf9\u5e94\u503c\u6765\u3002<\/span><\/p>\n

\u3000\u3000\u8fd0\u884c\u7a0b\u5e8f\uff0c\u4e00\u822c\u6765\u8bf4\u662f\u6b63\u5e38\u7684\uff0c\u4f46\u662f\u4e00\u65e6cds1\u7684\u88abLookup\u5b57\u6bb5\u4e2d\u7684\u503c\u51fa\u73b0\u4e86\u4e00\u4e2a\u5355\u5f15\u53f7”‘”\uff08\u60a8\u53ef\u4ee5\u4fee\u6539\u6216\u65b0\u589e\u4e00\u6761\u8bb0\u5f55\uff0c\u8f93\u5165\u5355\u5f15\u53f7\u8bd5\u8bd5\uff09\uff0c\u7acb\u5373\u4f1a\u5bfc\u81f4\u51fa\u9519\uff1a Unterminated string constant\uff08\u672a\u7ed3\u675f\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\uff09\u3002 <\/span><\/p>\n

\u3000\u3000BUG\u5206\u6790\u4e0e\u4fee\u590d\uff1a<\/strong><\/em><\/span><\/p>\n

\u3000\u3000\u8fd9\u4e2aBUG\u7684\u4ea7\u751f\u539f\u56e0\u8981\u6bd4\u4e0a\u4e00\u4e2a\u660e\u663e\u5f97\u591a\uff0c\u4e00\u5b9a\u662f\u6ca1\u6709\u6b63\u786e\u5904\u7406\u5355\u5f15\u53f7\u5e26\u6765\u7684\u526f\u4f5c\u7528\u5f15\u8d77\u7684\u3002<\/span><\/p>\n

\u3000\u3000\u540c\u6837\u7684\uff0c\u6211\u4eec\u6765\u8ddf\u8e2aVCL\u7684\u6e90\u7801\uff1a<\/span><\/p>\n

\u3000\u3000\u8fd0\u884c\u7a0b\u5e8f\uff0c\u51fa\u9519\u65f6\u6253\u5f00Call Stack\u7a97\u53e3\uff08\u5728View->Debug Windows\uff09\u83dc\u5355\u4e2d\uff0c\u67e5\u770b\u51fd\u6570\u8c03\u7528\u60c5\u51b5\uff0c\u524d\u9762\u7684\u4e00\u4e9b\u8c03\u7528\u662f\u663e\u800c\u6613\u89c1\u7684\uff0c\u6ca1\u6709\u95ee\u9898\uff0c\u6211\u4eec\u4ece\u8ddfLookup\u6709\u5173\u7684\u5730\u65b9\u5f00\u59cb\u67e5\u539f\u56e0\uff0c\u7b2c\u4e00\u4e2a\u4e0eLookup\u6709 \u5173\u7684\u51fd\u6570\u8c03\u7528\u662fTField.CalcLookupValue\uff0c\u6211\u4eec\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u8bbe\u7f6e\u65ad\u70b9\uff0c\u91cd\u65b0\u8fd0\u884c\u7a0b\u5e8f\uff0c\u4e2d\u65ad\u4e0b\u6765\u540e\uff0c\u8fdb\u884c\u5355\u6b65\u8c03\u8bd5\u3002<\/span><\/p>\n

\u3000\u3000TCustomClientDataSet.Lookup->TCustomClientDataSet.LocateRecord<\/span><\/p>\n

\u3000\u3000\u7ecf\u8fc7\u4e0a\u9762\u7684\u51e0\u6b21\u51fd\u6570\u8c03\u7528\uff0c\u5f88\u5feb\u7684\uff0c\u6211\u4eec\u5c31\u628a\u76ee\u6807\u5b9a\u5728\u4e86 LocateRecord\u8fc7\u7a0b\u4e2d\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u6839\u636eLookup\u5b57\u6bb5\u7684\u8bbe\u7f6e\u60c5\u51b5\uff0c\u751f\u6210\u76f8\u5e94\u7684\u8fc7\u6ee4\u6761\u4ef6\uff0c\u7136\u540e\u5230\u76ee\u6807\u6570\u636e\u96c6\u4e2d\u628a\u5bf9\u5e94\u7684\u503c\u627e\u5230\uff0c\u9519\u5c31\u9519\u5728\u8fc7 \u6ee4\u6761\u4ef6\u7684\u751f\u6210\u4e0a\u4e86\u3002\u6bd4\u5982\uff0c\u6211\u4eec\u8981\u6309cds1\u4e2dCust\u5b57\u6bb5\uff08\u5047\u8bbe\u662f001\uff09\u7684\u503c\u5230cds2\u4e2d\u6309CustID\u5b57\u6bb5\u503c\u627e\u5230\u5bf9\u5e94\u7684CustName\u5b57\u6bb5\u503c\u3002\u90a3\u751f \u6210\u7684\u6761\u4ef6\u5c31\u5e94\u8be5\u662f[CustID] = ‘001’\uff0c\u4f46\u5982\u679cCust\u7684\u503c\u662faa’bb\uff0c\u6309\u751f\u6210\u7684\u6761\u4ef6\u5c31\u4f1a\u53d8\u6210[CustID] = ‘aa’bb’\uff0c\u663e\u7136\u5bfc\u81f4\u4e86\u4e00\u4e2a\u672a\u7ed3\u675f\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u3002<\/span><\/p>\n

\u3000\u3000\u901a\u5e38\u6211\u4eec\u89e3\u51b3\u5355\u5f15\u53f7\u4e2d\u53c8\u51fa\u73b0\u5355\u5f15\u53f7\u7684\u60c5\u51b5\uff0c\u53ea\u9700\u628a\u5f15\u53f7\u4e2d\u7684\u5f15\u53f7\u5199\u4e24\u5c31\u884c\u4e86\uff0c\u8fd9\u91cc\u4e5f\u662f\u4e00\u6837\uff0c\u53ea\u8981\u8ba9\u751f\u6210\u7684\u6761\u4ef6\u53d8\u6210[CustID] = ‘aa”bb’\u5c31\u4e0d\u4f1a\u51fa\u9519\u4e86\u3002\u6240\u4ee5\u53ef\u4ee5\u8fd9\u6837\u4fee\u6539\u6e90\u4ee3\u7801\uff1a<\/span><\/p>\n

\u3000\u3000\u5728LocateRecord\u8fc7\u7a0b\u4e2d\u627e\u5230\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/span><\/p>\n

\u3000\u3000ftString, ftFixedChar, ftWideString, ftGUID
\nif (i = Fields.Count – 1) and (loPartialKey in Options) then
\nValStr := Format(”’%s*”’,[VarToStr(Value)]) else
\nValStr := Format(”’%s”’,[VarToStr(Value)]);<\/span><\/p>\n

\u3000\u3000\u6539\u6210\uff1a<\/span><\/p>\n

\u3000\u3000ftString, ftFixedChar, ftWideString, ftGUID:
\nif (i = Fields.Count – 1) and (loPartialKey in Options) then
\nValStr := Format(”’%s*”’,[ StringReplace(VarToStr(Value),””,”””,[rfReplaceAll])])
\nelse
\nValStr := Format(”’%s”’,[ StringReplace(VarToStr(Value),””,”””,[rfReplaceAll])]);<\/span><\/p>\n

\u3000\u3000\u4e5f\u5c31\u662f\u5728\u751f\u6210\u8fc7\u6ee4\u6761\u4ef6\u5b57\u7b26\u4e32\u65f6\u628a\u6761\u4ef6\u7684\u8fc7\u6ee4\u503c\u4e2d\u7684\u5355\u5f15\u53f7\u5168\u90e8\u4e00\u4e2a\u53d8\u4e24\u3002<\/span><\/p>\n

\u3000\u3000\u4e3a\u4e86\u786e\u4fdd\u8fd9\u6837\u4fee\u6539\u7684\u6b63\u786e\u6027\uff0c\u6211\u67e5\u770b\u4e86TCustomADODataSet\u4e2d \u7684\u5bf9\u5e94\u7684LocateRecord\u8fc7\u7a0b\uff08\u5728\u7528TADODataSet\u4e2d\u7684Lookup\u5b57\u6bb5\u65f6\u4e0d\u4f1a\u56e0\u5355\u5f15\u53f7\u51fa\u9519\uff0c\u53ea\u5728\u7528 TCustomClientDataSet\u65f6\u6709\u8fd9\u6837\u7684\u60c5\u51b5\uff09\uff0c\u5b83\u7684\u5904\u7406\u65b9\u6cd5\u4e0eTCustomClientDataSet\u7a0d\u6709\u4e0d\u540c\uff0c\u5b83\u662f\u901a\u8fc7 GetFilterStr\u51fd\u6570\u6765\u6784\u9020\u8fc7\u6ee4\u6761\u4ef6\u7684\uff0c\u4f46\u5728GetFilterStr\u4e2d\uff0c\u5b83\u6b63\u786e\u5904\u7406\u4e86\u5355\u5f15\u53f7\u7684\u95ee\u9898\u3002\u6240\u4ee5\u8fd9\u6837\u6765\u770b\uff0c\u6ca1\u6709\u5728 TCustomClientDataSet\u7684LocateRecord\u4e2d\u6b63\u786e\u5904\u7406\u5355\u5f15\u53f7\u7684\u95ee\u9898\uff0c\u786e\u5b9e\u662fBorland\u4e00\u4e2a\u4e0d\u5927\u4e0d\u5c0f\u7684\u758f\u6f0f\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Delphi\u4e2d\u4e24\u4e2aBUG\u7684\u5206\u6790\u4e0e\u4fee\u590d \u3000\u3000\u5728\u4f7f\u7528Delphi 7\u8fdb\u884c\u4e09\u5c42\u6570\u636e\u5e93\u5f00 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,11],"tags":[],"class_list":["post-112","post","type-post","status-publish","format-standard","hentry","category-csdn","category-11"],"_links":{"self":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/comments?post=112"}],"version-history":[{"count":0,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/112\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/media?parent=112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/categories?post=112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/tags?post=112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}