{"id":2181,"date":"2015-03-21T21:56:46","date_gmt":"2015-03-21T13:56:46","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=2181"},"modified":"2015-07-17T21:40:17","modified_gmt":"2015-07-17T13:40:17","slug":"tqconverter-%e6%95%b0%e6%8d%ae%e9%9b%86%e4%b8%8e%e6%95%b0%e6%8d%ae%e6%b5%81%e4%b9%8b%e9%97%b4%e7%9a%84%e8%bd%ac%e6%8e%a5%e6%a1%a5","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=2181","title":{"rendered":"TQConverter &#8211; \u6570\u636e\u96c6\u4e0e\u6570\u636e\u6d41\u4e4b\u95f4\u7684\u8f6c\u63a5\u6865"},"content":{"rendered":"<p>TQConverter \u5728 QDB \u4e2d\u5360\u636e\u4e86\u91cd\u8981\u7684\u4f4d\u7f6e\uff0c\u5b83\u662f\u6570\u636e\u4e0e\u6570\u636e\u6d41\u4e4b\u95f4\u7684\u683c\u5f0f\u8f6c\u6362\u5668\uff0c\u5b83\u7684\u7528\u9014\u5728\u4e8e\uff1a<\/p>\n<ul>\n<li>\u5229\u7528 TQDataSet \u7684 LoadFromStream\/LoadFromFile \u51fd\u6570\u5c06\u6570\u636e\u4ece\u6587\u4ef6\u6216\u6d41\u4e2d\u52a0\u8f7d\u5230 TQDataSet \u6570\u636e\u96c6\u5bf9\u8c61<\/li>\n<li>\u5229\u7528 TQDataSet \u7684 SaveToStream\/SaveToFile \u51fd\u6570\u5c06\u6570\u636e\u4ece TQDataSet \u6570\u636e\u96c6\u8f93\u51fa\u5230\u6587\u4ef6\u6216\u6d41\u4e2d<\/li>\n<li>\u5229\u7528 TQProvider \u7684 ApplyChanges \u5c06\u53d8\u66f4\u5185\u5bb9\u4ece\u6587\u4ef6\u6216\u6d41\u4e2d\u63d0\u4ea4\u5230 TQProvider \u5bf9\u5e94\u7684\u6570\u636e\u5e93\u4e2d<\/li>\n<li>\u5229\u7528 TQProvider \u7684 OpenDataStream \u51fd\u6570\u5c06\u4ece\u6570\u636e\u5e93\u53d6\u51fa\u7684\u6570\u636e\u76f4\u63a5\u4fdd\u5b58\u5230\u6587\u4ef6\u6216\u6d41\u4e2d<\/li>\n<\/ul>\n<p>\u8003\u8651\u5230\u6570\u636e\u4fdd\u5b58\u5230\u6587\u4ef6\u6216\u6d41\u65f6\uff0c\u9700\u8981\u52a0\u5bc6\u548c\u538b\u7f29\u6570\u636e\u7684\u5904\u7406\uff0c\u56e0\u6b64 TQConverter \u5bf9\u6b64\u63d0\u4f9b\u4e86\u652f\u6301\uff0c\u53ef\u4ee5\u4e3a\u5176\u5173\u8054\u591a\u4e2a TQStreamProcessor \uff08\u6d41\u5904\u7406\u5668\uff09\u5b50\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u6bcf\u4e00\u6b65\u90fd\u5bf9\u76ee\u6807\u6570\u636e\u6d41\u8fdb\u884c\u5fc5\u8981\u7684\u5904\u7406\u3002<\/p>\n<p>TQConverter\u3001TQProvider\u3001TQStreamProcessor\u3001TQDataSet \u56db\u8005\u4e4b\u95f4\u7684\u5173\u7cfb\u5927\u81f4\u53ef\u7528\u4e0b\u56fe\u8868\u793a\uff1a<\/p>\n<p><a href=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/QDB.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2182\" src=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/QDB.jpg\" alt=\"QDB\" width=\"648\" height=\"496\" srcset=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/QDB.jpg 648w, https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/QDB-300x230.jpg 300w\" sizes=\"auto, (max-width: 648px) 100vw, 648px\" \/><\/a>\u4e0b\u9762\u6211\u4eec\u5c06\u7ed3\u5408 TQJsonConverter \u6765\u8bf4\u660e\u4e00\u4e0b\u5982\u4f55\u7f16\u5199\u81ea\u5df1\u7684\u683c\u5f0f\u8f6c\u6362\u5668\u3002\u9996\u5148\uff0c\u6211\u4eec\u770b\u4e00\u4e0b TQConverter \u7684\u63a5\u53e3\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">TQConverter = class(TComponent)\r\n  protected\r\n    FDataSet: TQDataSet;\r\n    FExportRanges: TQExportRanges;\r\n    FStream: TStream;\r\n    FOriginStream: TStream;\r\n    FDataSetCount: Integer;\r\n    FActiveDataSet: Integer;\r\n    FOnProgress: TQDataConveterProgress;\r\n    FStreamProcessors: TQStreamProcessors;\r\n    procedure SetDataSet(const Value: TQDataSet);\r\n    \/\/ \u5bfc\u51fa\u63a5\u53e3\r\n    procedure BeforeExport; virtual;\r\n    procedure BeginExport(AIndex:Integer);virtual;\r\n    procedure SaveFieldDefs(ADefs: TQFieldDefs); virtual; abstract;\r\n    function WriteRecord(ARec: TQRecord): Boolean; virtual; abstract; \/\/ \u5199\u51fa\u6570\u636e\r\n    function EndExport(AIndex:Integer);virtual;\r\n    procedure AfterExport; virtual;\r\n    \/\/ \u5bfc\u5165\u63a5\u53e3\r\n    procedure BeforeImport; virtual;\r\n    procedure BeginImport(AIndex:Integer);virtual;\r\n    procedure LoadFieldDefs(AFieldDefs: TQFieldDefs); virtual; abstract;\r\n    function ReadRecord(ARec: TQRecord): Boolean; virtual; abstract; \/\/ \u5bfc\u5165\u6570\u636e\u5185\u5bb9\r\n    procedure EndImport(AIndex:Integer);virtual;\r\n    procedure AfterImport; virtual;\r\n    \/\/ \u8fdb\u5ea6\r\n    procedure DoProgress(AStep: TQConvertStep; AProgress, ATotal: Integer);\r\n    property ActiveDataSet:Integer read FActiveDataSet write FActiveDataSet;\r\n    property DataSetCount: Integer read FDataSetCount write FDataSetCount;\r\n  public\r\n    constructor Create(AOwner: TComponent); override;\r\n    destructor Destroy; override;\r\n  published\r\n    property ExportRanges: TQExportRanges read FExportRanges\r\n      write FExportRanges;\r\n    property OnProgress: TQDataConveterProgress read FOnProgress\r\n      write FOnProgress;\r\n    property DataSet: TQDataSet read FDataSet write SetDataSet;\r\n    property StreamProcessors: TQStreamProcessors read FStreamProcessors;\r\n  end;<\/pre>\n<p>\u7136\u540e\u6211\u4eec\u5148\u4ecb\u7ecd\u4e00\u4e0b\u4fdd\u5b58\u6570\u636e\u5230\u6d41\u65f6\uff0c\u5230\u5e95\u53d1\u751f\u4ec0\u4e48\uff0c\u8fd9\u5757\u5927\u5bb6\u53ef\u4ee5\u7ed3\u5408 TQDataSet.SaveToStream \u51fd\u6570\u6765\u4e86\u89e3\uff0c\u4e3a\u4e86\u8282\u7701\u7bc7\u5e45\uff0c\u6211\u4eec\u5728\u6b64\u5c31\u4e0d\u76f4\u63a5\u8f6c\u8f7d\u6e90\u7801\u3002<\/p>\n<ol>\n<li>\u51c6\u5907\u5bfc\u51fa\u9636\u6bb5\uff1a\n<ul>\n<li>\u8bbe\u7f6e TQConverter \u8f6c\u6362\u5668\u5b9e\u4f8b\u7684 FStream \u548c FDataSet \u5c5e\u6027\u4e3a\u76ee\u6807\u6570\u636e\u6d41\u548c\u5f53\u524d\u6e90\u6570\u636e\u96c6\uff1b<\/li>\n<li>\u6839\u636e TQConverter.ExportRanges \u5c5e\u6027\uff0c\u786e\u5b9a\u8981\u5bfc\u51fa\u7684\u4ec0\u4e48\u72b6\u6001\u7684\u8bb0\u5f55\uff08 AcceptStatus \u7528\u6765\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001\u7684\u96c6\u5408\uff09\uff1b<\/li>\n<li>\u8c03\u7528 TQConverter \u8f6c\u6362\u5668\u7684 BeforeExport \u51fd\u6570\uff0c\u4ee5\u4fbf\u8ba9 TQConverter \u5728\u771f\u6b63\u6267\u884c\u5bfc\u51fa\u64cd\u4f5c\u4e4b\u524d\u505a\u4e00\u4e9b\u9700\u8981\u7684\u5904\u7406\uff08TQConverter \u672c\u8eab\u7684\u5b9e\u73b0\u91cc\uff0c\u5982\u679c\u4f60\u6307\u5b9a\u4e86\u6d41\u5904\u7406\u5668\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u5185\u5b58\u6d41\u6765\u5b58\u653e\u5bfc\u51fa\u7ed3\u679c\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u5199\u5230\u76ee\u6807\u6d41\u91cc\uff0c\u4ee5\u65b9\u4fbf\u540e\u7eed\u5904\u7406\u3002\u5b50\u7c7b\u53ef\u4ee5\u91cd\u8f7d\u4ee5\u589e\u52a0\u989d\u5916\u7684\u63a7\u5236\uff09\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>\u5bfc\u51fa\u6570\u636e\u9636\u6bb5 : \u6b64\u9636\u6bb5\u9700\u8981\u533a\u5206\u4e0b\u5f53\u524d\u6570\u636e\u96c6\u662f\u5355\u4e00\u6570\u636e\u96c6\u8fd8\u662f\u591a\u4e2a\u6570\u636e\u96c6\uff0c\u5982\u679c\u662f\u5355\u4e00\u6570\u636e\u96c6\uff0c\u90a3\u4e48\u76f4\u63a5\u5bfc\u51fa\u5f53\u524d\u6570\u636e\u96c6\uff1b\u53cd\u4e4b\uff0c\u5219\u5faa\u73af\u5bfc\u51fa\u6bcf\u4e2a\u5b50\u6570\u636e\u96c6\uff08\u524d\u63d0\u662f TQConverter \u7684\u5b50\u7c7b\u652f\u6301\u5bfc\u51fa\u591a\u4e2a\u6570\u636e\u96c6\uff09\u3002\u5728\u5bfc\u51fa\u65f6\uff0cTQConverter \u5b9e\u4f8b\u53ef\u4ee5\u901a\u8fc7 DataSetCount \u5c5e\u6027\uff0c\u4e86\u89e3\u9700\u8981\u5bfc\u51fa\u591a\u5c11\u4e2a\u6570\u636e\u96c6\uff0c\u901a\u8fc7 ActiveDataSet \u5c5e\u6027\u6765\u77e5\u9053\u5f53\u524d\u5bfc\u51fa\u7684\u662f\u7b2c\u51e0\u4e2a\u6570\u636e\u96c6\uff08\u7d22\u5f15\u4ece 0 \u5f00\u59cb\uff09\u3002\u5bfc\u51fa\u6bcf\u4e2a\u6570\u636e\u96c6\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a\n<ul>\n<li>\u9996\u5148\u8c03\u7528 TQConverter \u7684 BeginExport \u6765\u901a\u77e5\u8f6c\u6362\u5668\u8981\u5bfc\u51fa\u7684\u6570\u636e\u96c6\u7d22\u5f15\uff1b<\/li>\n<li>\u5982\u679c\u5bfc\u51fa\u8303\u56f4\u5305\u542b merMeta \uff0c\u5219\u8c03\u7528 TQConverter \u5b9e\u4f8b\u7684 SaveFieldDefs \u6765\u5bfc\u51fa\u5f53\u524d\u6570\u636e\u8868\u7684\u5b57\u6bb5\u5b9a\u4e49\u4fe1\u606f\uff1b<\/li>\n<li>\u9488\u5bf9\u6bcf\u6761\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\uff0c\u8c03\u7528 TQConverter \u7684 WriteRecord \u65b9\u6cd5\u6765\u5b8c\u6210\u5355\u6761\u8bb0\u5f55\u6570\u636e\u7684\u5bfc\u51fa\u64cd\u4f5c\u76f4\u5230\u5168\u90e8\u5b8c\u6210\uff1b<\/li>\n<li>\u8c03\u7528 TQConverter \u7684 EndExport \u6765\u901a\u77e5\u8f6c\u6362\u5668\u6307\u5b9a\u7d22\u5f15\u7684\u6570\u636e\u96c6\u5bfc\u51fa\u7ed3\u675f\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u675f\u5bfc\u51fa\u9636\u6bb5\n<ol>\n<li>\u8c03\u7528 TQConverter.AfterExport \u51fd\u6570\u6765\u5b8c\u6210\u5bfc\u51fa\u8fc7\u7a0b\u7684\u6e05\u7406\u5de5\u4f5c\uff08\u5728 TQConverter \u672c\u8eab\u7684\u5b9e\u73b0\u91cc\uff0c\u5982\u679c\u4f60\u6307\u5b9a\u4e86\u6d41\u5904\u7406\u5668\uff0c\u5219\u4f1a\u987a\u5e8f\u8c03\u7528\u6d41\u5904\u7406\u5668\uff0c\u5bf9\u5bfc\u51fa\u7684\u5185\u5bb9\u8fdb\u884c\u5904\u7406\uff0c\u5e76\u5c06\u5904\u7406\u7ed3\u679c\u5199\u56de\u5230\u76ee\u6807\u6570\u636e\u6d41\uff09\uff1b<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p>\u53cd\u8fc7\u6765\uff0c\u5f53\u6211\u4eec\u4ece\u6d41\u6216\u6587\u4ef6\u4e2d\u52a0\u8f7d\u6570\u636e\u5230\u6570\u636e\u96c6\u91cc\u65f6\uff0c\u6211\u4eec\u7ed3\u5408LoadFromStream\u65b9\u6cd5\uff0c\u6765\u770b\u5b83\u90fd\u6267\u884c\u4e86\u90a3\u4e9b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u51c6\u5907\u5bfc\u5165\u9636\u6bb5\n<ul>\n<li>\u5173\u95ed\u5f53\u524d\u6570\u636e\u96c6\uff1b<\/li>\n<li>\u5c06\u6253\u5f00\u65b9\u5f0f\u8bbe\u7f6e\u4e3a dsomByConverter\uff0c\u4ee5\u901a\u77e5\u540e\u9762\u6253\u5f00\u6570\u636e\u96c6\u64cd\u4f5c\u8c03\u7528 InternalOpen \u51fd\u6570\u65f6\uff0c\u6309\u4ece\u8f6c\u6362\u5668\u5bfc\u5165\u6570\u636e\u7684\u65b9\u5f0f\u6765\u521d\u59cb\u5316\u76f8\u5173\u64cd\u4f5c\uff1b<\/li>\n<li>\u8bbe\u7f6e TQConverter \u8f6c\u6362\u5668\u5b9e\u4f8b\u7684 FStream \u548c FDataSet \u5c5e\u6027\u4e3a\u6e90\u6570\u636e\u6d41\u548c\u5f53\u524d\u6570\u636e\u96c6\uff08\u76ee\u6807\uff09\uff1b<\/li>\n<li>\u89e6\u53d1 TQConverter.BeforeImport \u51fd\u6570\uff0c\u4ee5\u4fbf\u8ba9 TQConverter \u5b9e\u4f8b\u6765\u505a\u4e00\u4e9b\u5bfc\u5165\u524d\u7684\u51c6\u5907\u5de5\u4f5c\uff08\u5728 TQConverter \u81ea\u8eab\u7684\u5b9e\u73b0\u91cc\uff0c\u5982\u679c\u6307\u5b9a\u4e86\u6d41\u5904\u7406\u5668\uff0c\u5219\u9006\u5e8f\u8c03\u7528\u8fd9\u4e9b\u6d41\u5904\u7406\u5668\u7684 BeforeLoad \u65b9\u6cd5\uff0c\u8fdb\u884c\u6570\u636e\u5904\u7406\u3002\u8fd9\u548c AfterExport \u4e2d\u7684\u5b9e\u73b0\u987a\u5e8f\u6b63\u597d\u76f8\u53cd\uff09\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>\u5bfc\u5165\u6570\u636e\u9636\u6bb5\uff1a\u6b64\u9636\u6bb5\u9700\u8981\u533a\u5206\u4e0b\u5f53\u524d\u6d41\u4e2d\u5305\u542b\u7684\u662f\u5355\u4e00\u6570\u636e\u96c6\u8fd8\u662f\u591a\u4e2a\u6570\u636e\u96c6\uff0c\u5982\u679c\u662f\u5355\u4e00\u6570\u636e\u96c6\uff0c\u90a3\u4e48\u76f4\u63a5\u5bfc\u5165\u5230\u5f53\u524d\u6570\u636e\u96c6\uff1b\u53cd\u4e4b\uff0c\u5219\u5faa\u73af\u5bfc\u5165\u5230\u6bcf\u4e2a\u5b50\u6570\u636e\u96c6\u3002\u5728\u524d\u9762\u8c03\u7528 TQConverter.BeforeImport \u51fd\u6570\u65f6\uff0c\u5b50\u7c7b\u5e94\u91cd\u8f7d\u8bbe\u7f6e\u597d DataSetCount \u5c5e\u6027\u6765\u544a\u8bc9\u5bfc\u5165\u8fc7\u7a0b\u603b\u5171\u6709\u591a\u5c11\u4e2a\u6570\u636e\u96c6\u3002\u800c\u5728\u5bfc\u5165\u65f6\uff0c\u5bfc\u5165\u8fc7\u7a0b\u901a\u8fc7\u8bbe\u7f6e ActiveDataSet \u5c5e\u6027\u6765\u544a\u8bc9 TQConverter \u5b9e\u4f8b\u5f53\u524d\u5bfc\u5165\u7684\u662f\u7b2c\u51e0\u4e2a\u6570\u636e\u96c6\uff08\u7d22\u5f15\u4ece 0 \u5f00\u59cb\uff09\u3002\u5bfc\u5165\u6bcf\u4e2a\u6570\u636e\u96c6\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a\n<ul>\n<li>\u9996\u5148\u8c03\u7528 TQConverter \u7684 BeginImport \u65b9\u6cd5\u6765\u544a\u8bc9\u8f6c\u6362\u5668\u8981\u5bfc\u5165\u7684\u6570\u636e\u96c6\u7d22\u5f15\u53f7\uff1b<\/li>\n<li>\u8c03\u7528 TQConverter \u5b9e\u4f8b\u7684 LoadFieldDefs \u6765\u5bfc\u5165\u5f53\u524d\u6570\u636e\u8868\u7684\u5b57\u6bb5\u5b9a\u4e49\u4fe1\u606f\uff1b<\/li>\n<li>\u8c03\u7528 TQConverter \u7684 ReadRecord \u65b9\u6cd5\u6765\u5b8c\u6210\u5355\u6761\u8bb0\u5f55\u6570\u636e\u7684\u8bfb\u53d6\u64cd\u4f5c\u76f4\u5230\u5168\u90e8\u8bfb\u53d6\u5b8c\u6210\uff0c\u51fd\u6570\u8fd4\u56de False\uff1b<\/li>\n<\/ul>\n<ul>\n<li>\u8c03\u7528 TDataSet.Open \u65b9\u6cd5\u6570\u636e\u96c6\u5bf9\u8c61\u3002\u5982\u679c\u6709\u591a\u4e2a\u6570\u636e\u96c6\uff0c\u5219\u901a\u8fc7\u8bbe\u7f6e\u5f53\u524d\u6d3b\u52a8\u6570\u636e\u96c6\u4e3a\u7b2c\u4e00\u4e2a\u6570\u636e\u96c6\u6765\u6253\u5f00\u6570\u636e\u96c6\uff1b<\/li>\n<li>\u8c03\u7528 TQConverter \u7684 EndImport \u65b9\u6cd5\u6765\u544a\u8bc9\u8f6c\u6362\u5668\u5bfc\u5165\u6307\u5b9a\u7d22\u5f15\u7684\u6570\u636e\u96c6\u5b8c\u6210\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u675f\u5bfc\u5165\u9636\u6bb5\n<ul>\n<li>\u8c03\u7528 TQConverter.AfterImport \u51fd\u6570\uff0c\u4ee5\u4fbf\u8ba9 TQConverter \u5b9e\u4f8b\u6765\u505a\u4e00\u4e9b\u6e05\u7406\u5de5\u4f5c\uff1b<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u4e0a\u9762\u5c31\u662f TQConverter \u5bfc\u51fa\u548c\u5bfc\u5165\u5230\u6570\u636e\u96c6\u7684\u8fc7\u7a0b\uff0c\u800c TQProvider \u8c03\u7528 ApplyChanges \u5e94\u7528\u66f4\u65b0\u7684\u8fc7\u7a0b\u4e0e\u4e9b\u7c7b\u4f3c\uff0c\u53ea\u662f\u4e2d\u95f4\u72b6\u6001\u7684\u68c0\u6d4b\u7565\u6709\u4e0d\u540c\uff0c\u4f46\u90a3\u4e9b\u90fd\u662f\u7531 TQProvider \u6765\u5b8c\u6210\u7684\u3002\u5177\u4f53\u5230 TQConverter \u4e0a\u6765\u8bf4\uff0c\u5b83\u5e76\u6ca1\u6709\u4efb\u4f55\u4e0d\u540c\u3002<\/p>\n<p>\u90a3\u4e48\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c31\u770b\u770b TQJsonConverter \uff08\u4f4d\u4e8e qconverter_stds.pas \uff09 \u90fd\u91cd\u8f7d\u5e72\u4e86\u70b9\u5565\uff1f<\/p>\n<p>\u5728\u7ee7\u7eed\u4e4b\u524d\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u4e0b TQJsonConverter \u7ea6\u5b9a\u7684 JSON \u6570\u636e\u5305\u683c\u5f0f\uff0c\u4e0b\u56fe\u662f\u76f4\u63a5\u622a\u53d6\u81ea MsgPackView \uff1a<\/p>\n<p><a href=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/qds_jsonformat.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2185\" src=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/qds_jsonformat.jpg\" alt=\"qds_jsonformat\" width=\"299\" height=\"452\" srcset=\"https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/qds_jsonformat.jpg 299w, https:\/\/blog.qdac.cc\/wp-content\/uploads\/2015\/03\/qds_jsonformat-198x300.jpg 198w\" sizes=\"auto, (max-width: 299px) 100vw, 299px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Type \uff1a\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u56fa\u5b9a\u4e3a QDAC.DataSet\uff0c\u4ee5\u4fbf\u6807\u8bb0\u8fd9\u7531\u4e8e TQJsonConverter \u751f\u6210\u7684\u6570\u636e\uff0c\u7528\u4e8e\u52a0\u8f7d\u65f6\u8fdb\u884c\u683c\u5f0f\u68c0\u6d4b\uff1b<\/li>\n<li>DataSets \uff1a \u6570\u7ec4\u7c7b\u578b\uff0c\u7528\u4e8e\u4fdd\u5b58\u4e00\u5230\u591a\u4e2a\u6570\u636e\u96c6\u7684\u5185\u5bb9\uff0c\u6bcf\u4e2a\u6570\u636e\u96c6\u5bf9\u8c61\u4e3a\u4e00\u9879\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u6570\u636e\u96c6\u5bf9\u8c61\uff0c\u5176\u5b83\u4e49\u5982\u4e0b\uff1a\n<ul>\n<li>Fields \uff1a\u5bf9\u8c61\u7c7b\u578b\uff0c\u5b83\u5305\u542b\u4e86\u4e86\u6bcf\u4e00\u4e2a\u5b57\u6bb5\u7684\u5b9a\u4e49\u4fe1\u606f\uff0c\u6bcf\u4e2a\u5b57\u6bb5\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b57\u6bb5\u540d\u505a\u4e3a\u5bf9\u8c61\u7684\u540d\u79f0\u3002\u4e0b\u9762\u7684\u5217\u51fa\u4e86\u5176\u4e2d\u7684\u5404\u4e2a\u9879\u76ee\u540d\u79f0\uff0c\u5176\u4e2d\uff0c\u9664\u4e86 FieldType \u548c Flags \u662f\u5fc5\u7136\u5b58\u5728\u7684\uff0c\u5176\u5b83\u90fd\u6709\u53ef\u80fd\u4e0d\u5b58\u5728\uff0c\u6b64\u65f6\u5b83\u4eec\u53d6\u9ed8\u8ba4\u503c\u3002\n<ul>\n<li>FieldType\u00a0\uff1a\u6574\u6570\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u6bb5\u7c7b\u578b\u5bf9\u5e94\u7684\u6574\u6570\u503c\uff1b<\/li>\n<li>Flags \uff1a \u6574\u6570\uff0c\u5185\u90e8\u6807\u5fd7\uff0c\u53c2\u8003\u6e90\u7801\u4e2d\u6570\u636e\u5217\u5c5e\u6027\u5b9a\u4e49\u4e2d\u7684 SCHEMA_XXX \u6807\u5fd7\u4f4d\u5b9a\u4e49\uff1b<\/li>\n<li>Size \uff1a\u6574\u6570\uff0c\u7528\u4e8e\u4fdd\u5b58\u5185\u5bb9\u957f\u5ea6\uff0c\u5bf9\u4e8e\u5185\u90e8\u4fdd\u7559\u7c7b\u578b\uff0c\u8be5\u5b57\u6bb5\u53ef\u80fd\u4e0d\u5b58\u5728\u6216\u4e3a0\uff1b<\/li>\n<li>Prec \uff1a\u6574\u6570\uff0c\u7528\u4e8e\u4fdd\u5b58\u6570\u503c\u7cbe\u5ea6\uff1b<\/li>\n<li>Scale \uff1a\u6574\u6570\uff0c\u7528\u4e8e\u4fdd\u5b58\u5c0f\u6570\u70b9\u540e\u4f4d\u7f6e\uff1b<\/li>\n<li>Schema \uff1a \u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u6bb5\u6240\u96b6\u5c5e\u7684\u67b6\u6784\uff08\u5982\uff1adatabase.public.table \u4e2d\u7684 public\uff09\uff0c\u4e00\u822c\u6570\u636e\u5e93\u5bf9\u5e94\u7684\u662f\u7528\u6237\u540d\uff1b<\/li>\n<li>Catalog : \u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u6bb5\u6240\u96b6\u5c5e\u7684\u6570\u636e\u5e93\u540d\uff1b<\/li>\n<li>Table : \u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u4fdd\u5b58\u5b57\u6bb5\u96b6\u5c5e\u7684\u7269\u7406\u8868\u540d<\/li>\n<li>Base : \u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u4fdd\u5b58\u6570\u636e\u5e93\u4e2d\u539f\u59cb\u7684\u5b57\u6bb5\u540d\uff08\u5982\uff1aselect a as b from tab \u4e2d\u7684 a \u5373\u4e3a\u539f\u59cb\u5b57\u6bb5\u540d\uff09\uff1b<\/li>\n<li>DBType : \u6574\u6570\u503c\uff0c\u7528\u4e8e\u5b58\u8d2e\u6570\u636e\u5e93\u4e2d\u7684\u7269\u7406\u5b57\u6bb5\u7c7b\u578b\uff0c\u5bf9\u4e8e\u5185\u5b58\u8868\uff0c\u5b83\u59cb\u7ec8\u4e3a 0 \u6216\u4e0d\u5b58\u5728\uff1b<\/li>\n<li>DBNo : \u6574\u6570\u503c\uff0c\u8bb0\u5f55\u6570\u636e\u5e93\u4e2d\u5b57\u6bb5\u7684\u539f\u59cb\u987a\u5e8f\u53f7\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>Records : \u6570\u7ec4\u7c7b\u578b\uff0c\u7528\u4e8e\u4fdd\u5b58\u6bcf\u4e00\u6761\u8bb0\u5f55\u7684\u5185\u5bb9\u3002\u6bcf\u4e00\u6761\u8bb0\u5f55\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a\n<ul>\n<li>Status \uff1a \u6574\u6570\u503c\uff0c\u8bb0\u5f55\u6570\u636e\u7684\u72b6\u6001\uff08\u53c2\u8003 TUpdateStatus \u5b9a\u4e49\uff0c\u53d6\u679a\u4e3e\u503c\u7684\u6574\u6570\u503c\uff09\uff1b<\/li>\n<li>Old \uff1a \u6570\u7ec4\uff0c\u7528\u4e8e\u4fdd\u5b58\u8bb0\u5f55\u7684\u539f\u59cb\u503c\uff0c\u5bf9\u4e8e\u65b0\u589e\u7684\u8bb0\u5f55\uff0c\u5b83\u4e0d\u5b58\u5728\u3002\u6570\u7ec4\u7684\u6bcf\u4e00\u4e2a\u6210\u5458\u5bf9\u5e94\u4e8e\u5b57\u6bb5\u5b9a\u4e49\u76f8\u5bf9\u5e94\u4f4d\u7f6e\u7684\u5b57\u6bb5\u7684\u503c\uff1b<\/li>\n<li>New\uff1a\u6570\u7ec4\uff0c\u7528\u4e8e\u4fdd\u5b58\u8bb0\u5f55\u7684\u65b0\u503c\uff0c\u5bf9\u4e8e\u672a\u4fee\u6539\u6216\u5df2\u5220\u9664\u72b6\u6001\u7684\u8bb0\u5f55\uff0c\u5b83\u4e0d\u5b58\u5728\uff1b\u6570\u7ec4\u7684\u6bcf\u4e00\u4e2a\u6210\u5458\u5bf9\u5e94\u4e8e\u5b57\u6bb5\u5b9a\u4e49\u76f8\u5bf9\u5e94\u4f4d\u7f6e\u7684\u5b57\u6bb5\u7684\u503c\uff1b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u597d\u4e86\uff0c\u5b9a\u4e49\u5b8c\u4e8b\uff0c\u6211\u4eec\u770b\u5b9e\u73b0\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">  TQJsonConverter = class(TQConverter)\r\n  protected\r\n    FJson, FDSRoot, FActiveDS, FActiveRecs: TQJson;\r\n    FRecordIndex: Integer;\r\n    FLoadingDefs: TQFieldDefs;\r\n    procedure BeforeExport; override;\r\n    procedure SaveFieldDefs(ADefs: TQFieldDefs); override;\r\n    function WriteRecord(ARec: TQRecord): Boolean; override;\r\n    procedure AfterExport; override;\r\n    procedure BeforeImport; override;\r\n    procedure LoadFieldDefs(AFieldDefs: TQFieldDefs); override;\r\n    function ReadRecord(ARec: TQRecord): Boolean; override;\r\n    procedure AfterImport; override;\r\n  end;\r\n<\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u91cd\u8f7d\u4e86 TQConverter \u4e2d\u4e0e\u5bfc\u5165\u5bfc\u51fa\u76f8\u5173\u7684\u51e0\u4e2a\u51fd\u6570\uff1a<\/p>\n<ul>\n<li>\u5bfc\u51fa\u51fd\u6570\uff1aBeforeExport \u3001SaveFieldDefs \u3001 WriteRecord \u3001 AfterExport<\/li>\n<li>\u5bfc\u5165\u51fd\u6570\uff1aBeforeImport\u3001 LoadFieldDefs \u3001 ReadRecord \u3001 AfterImport<\/li>\n<\/ul>\n<p>\u540c\u65f6\uff0c\u5b83\u5b9a\u4e49\u4e86\u51e0\u4e2a\u53d8\u91cf\uff1a<\/p>\n<ul>\n<li>FJson \u4e3a\u5bfc\u5165\u5bfc\u51fa\u65f6\u7684 QJson \u7684\u6839\u7ed3\u70b9\uff1b<\/li>\n<li>FDSRoot \u4e3a\u6240\u6709\u5bfc\u5165\u6216\u5bfc\u51fa\u6570\u636e\u96c6\u7684\u6839\u7ed3\u70b9\uff1b<\/li>\n<li>FActiveDS \u4e3a\u5f53\u524d\u6b63\u5728\u5bfc\u5165\u6216\u5bfc\u51fa\u7684\u6570\u636e\u96c6\u6839\u7ed3\u70b9\uff1b<\/li>\n<li>FActiveRecs \u4e3a\u5f53\u524d\u5bfc\u5165\u6216\u5bfc\u51fa\u6570\u636e\u96c6\u7684\u8bb0\u5f55\u6839\u7ed3\u70b9\uff1b<\/li>\n<\/ul>\n<p>\u5269\u4e0b\u7684\u6b65\u9aa4\u5c31\u662f\u6309\u7167\u683c\u5f0f\u5728\u4e0a\u9762\u91cd\u8f7d\u7684\u51fd\u6570\u4e2d\u5b9e\u73b0\u5fc5\u8981\u7684\u64cd\u4f5c\u4e86\uff1a<\/p>\n<ul>\n<li>\u5bfc\u51fa\u51fd\u6570\n<ul>\n<li>BeforeExport\n<ul>\n<li>\u8c03\u7528\u7236\u5bf9\u8c61\u7684 BeforeExport\uff1b<\/li>\n<li>\u521b\u5efa FJson \u5bf9\u8c61\u7684\u5b9e\u4f8b\uff1b<\/li>\n<li>\u8bbe\u7f6e Type \u8282\u70b9\u7684\u503c\uff1b<\/li>\n<li>\u6dfb\u52a0 DataSets \u6839\u7ed3\u70b9\uff0c\u5e76\u4fdd\u5b58\u5230 FDSRoot \u53d8\u91cf\u4e2d\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>SaveFieldDefs :\n<ul>\n<li>\u6dfb\u52a0\u4e86 FActiveDS \u7ed3\u70b9\u6765\u8bb0\u5f55\u65b0\u7684\u6570\u636e\u96c6\uff1b<\/li>\n<li>\u4fdd\u5b58\u5b57\u6bb5\u4fe1\u606f\u5b9a\u4e49\u5230 Fields \u7ed3\u70b9\uff1b<\/li>\n<li>\u5982\u679c\u4e0d\u662f\u53ea\u4fdd\u5b58\u5143\u6570\u636e\uff0c\u5219\u521b\u5efa Records \u7ed3\u70b9\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>WriteRecord\n<ul>\n<li>\u00a0\u5199\u5165\u6307\u5b9a\u8bb0\u5f55\u7684\u5185\u5bb9\u5230 Json \u4e2d\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>AfterExport\n<ul>\n<li>\u5c06 FJson \u7684\u5185\u5bb9\u4fdd\u5b58\u5230\u76ee\u6807\u6570\u636e\u6d41\u4e2d\uff1b<\/li>\n<li>\u91ca\u653e FJson \u5bf9\u8c61\uff1b<\/li>\n<li>\u8c03\u7528\u7236\u5bf9\u8c61\u7684 AfterExport\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u5bfc\u5165\u51fd\u6570\n<ul>\n<li>BeforeImport\n<ul>\n<li>\u8c03\u7528\u7236\u5bf9\u8c61\u7684BeforeImport\uff1b<\/li>\n<li>\u521b\u5efa FJson \u5bf9\u8c61\u7684\u5b9e\u4f8b\uff1b<\/li>\n<li>\u68c0\u67e5 Type \u7ed3\u70b9\u7684\u503c\uff0c\u4ee5\u786e\u5b9a\u662f\u5426\u662f\u81ea\u5df1\u521b\u5efa\u7684\u683c\u5f0f\uff1b<\/li>\n<li>\u627e\u5230 DataSets \u6839\u7ed3\u70b9\uff0c\u4fdd\u5b58\u5230 FDSRoot \u53d8\u91cf\u4e2d\uff1b<\/li>\n<li>\u66f4\u65b0 DataSetCount \u7684\u503c\uff0c\u4ee5\u4fbf\u901a\u77e5\u5bfc\u5165\u8fc7\u7a0b\u5b9e\u9645\u7684\u6570\u636e\u96c6\u6570\u91cf\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>LoadFieldDefs \uff1a\n<ul>\n<li>\u5c06\u6d3b\u52a8\u7684\u6570\u636e\u96c6\u6839\u7ed3\u70b9\u8d4b\u7ed9 FActiveDS\uff1b<\/li>\n<li>\u7136\u540e\u5b57\u6bb5\u52a0\u8f7d\u5b9a\u4e49\uff1b<\/li>\n<li>\u627e\u5230 Records \u7ed3\u70b9\uff0c\u5e76\u8d4b\u7ed9 FActiveRecs\uff1b<\/li>\n<li>\u8bbe\u7f6e\u5f53\u524d\u8bb0\u5f55\u7d22\u5f15 FRecordIndex \u4e3a -1\uff1b<\/li>\n<\/ul>\n<\/li>\n<li>ReadRecord \uff1a\u6839\u636e FRecordIndex \u8bfb\u53d6\u4e0b\u4e00\u6761\u8bb0\u5f55\u7684\u5185\u5bb9\uff0c\u6210\u529f\uff0c\u8fd4\u56de True\uff0c\u5931\u8d25\uff0c\u8fd4\u56de False\uff1b<\/li>\n<li>AfterImport\uff1a\u8c03\u7528\u7236\u5bf9\u8c61\u7684 AfterExport \u548c\u91ca\u653e FJson \u5bf9\u8c61\uff1b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u597d\u4e86\uff0c\u5173\u4e8e TQConverter \u7684\u8bf4\u660e\uff0c\u6682\u65f6\u5c31\u5230\u8fd9\u513f\uff0c\u6709\u4e0d\u660e\u767d\u7684\u670b\u53cb\u53ef\u4ee5\u5728\u7fa4\u91cc\u76f4\u63a5\u95ee\u3002\u8be6\u7ec6\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u53ef\u4ee5\u53c2\u8003 qconverter_xxx.pas \u7684\u6e90\u7801\uff0c\u4ee5 qconverter \u6253\u5934\u7684\u6e90\u7801\u4e3a\u5404\u79cd\u8f6c\u6362\u5668\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TQConverter \u5728 QDB \u4e2d\u5360 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