{"id":650,"date":"2012-10-25T09:41:28","date_gmt":"2012-10-25T01:41:28","guid":{"rendered":"http:\/\/www.vcoo.cc\/blog\/?p=650"},"modified":"2012-10-25T09:41:28","modified_gmt":"2012-10-25T01:41:28","slug":"sqldatareader-notice","status":"publish","type":"post","link":"https:\/\/vcoo.cc\/blog\/650\/","title":{"rendered":"[\u8f6c]\u4f7f\u7528SqlDataReader\u6ce8\u610f\u7684\u51e0\u70b9"},"content":{"rendered":"

\u542c\u9ad8\u624b\u4eec\u8bf4\u5c3d\u91cf\u4e0d\u8981\u7528SqlDataReader\u800c\u6362\u7528DataSet\uff0c\u5bf9\u4e8e\u521d\u5b66\u8005\u7684\u6211\u6765\u8bf4\u8fd8\u771f\u662f\u4e0d\u592a\u6e05\u695a\u6709\u4ec0\u4e48\u6df1\u5c42\u542b\u4e49\uff0c\u641c\u7d22\u4e86\u4e0bSqlDataReader\u7684\u6ce8\u610f\u70b9\uff0c\u6bd4\u8f83\u6709\u7528\uff0c\u5982\u679c\u5e73\u65f6\u7528\u5230\u7684\u65f6\u5019\u6ce8\u610f\u4e00\u4e0b\u5e94\u8be5\u6ca1\u4ec0\u4e48\u95ee\u9898\u3002@VCOO<\/p>\n

1\u3001\u5f53SqlDataReader\u6ca1\u6709\u5173\u95ed\u4e4b\u524d\uff0c\u6570\u636e\u5e93\u8fde\u63a5\u4f1a\u4e00\u76f4\u4fdd\u6301open\u72b6\u6001\uff0c\u6240\u4ee5\u5728\u4f7f\u7528SqlDataReader\u65f6\uff0c\u4f7f\u7528\u5b8c\u6bd5\u5e94\u8be5\u9a6c\u4e0a\u8c03\u7528SqlDataReader.Close()\u5173\u95ed\u5b83\u3002<\/p>\n

2\u3001\u4e00\u4e2a\u8fde\u63a5\u53ea\u80fd\u88ab\u4e00\u4e2aSqlDataReader\u4f7f\u7528\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u8981\u5c3d\u65e9\u5173\u95edSqlDataReader\u7684\u539f\u56e0\u3002<\/p>\n

3\u3001\u4f7f\u7528\u5b8cSqlDataReader\u540e\uff0c\u4f60\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u663e\u793a\u7684\u8c03\u7528\u6570\u636e\u5e93\u8fde\u63a5\u5bf9\u8c61\u7684Close\u65b9\u6cd5\u5173\u95ed\u8fde\u63a5\uff0c\u4e5f\u53ef\u4ee5\u5728\u8c03\u7528Command\u5bf9\u8c61\u7684ExecuteReader\u65b9\u6cd5\u65f6\u4f20\u9012CommandBehavior.CloseConnection \u8fd9\u4e2a\u679a\u4e3e\u53d8\u91cf\uff0c\u8fd9\u6837\u5728\u8c03\u7528SqlDataReader\u7684Close\u65b9\u6cd5\u65f6\u4f1a\u81ea\u52a8\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u3002<\/p>\n

4\u3001\u4f7f\u7528SqlDataReader\u65f6\u5c3d\u91cf\u4f7f\u7528\u548c\u6570\u636e\u5e93\u5b57\u6bb5\u7c7b\u578b\u5339\u914d\u7684\u65b9\u6cd5\u6765\u53d6\u5f97\u76f8\u5e94\u7684\u503c\uff0c\u6bd4\u5982\u5bf9\u4e8e\u6574\u5f62\u7684\u5b57\u6bb5\u4f7f\u7528GetInt32,\u5bf9\u5b57\u7b26\u7c7b\u578b\u7684\u5b57\u6bb5\u4f7f\u7528GetString\u3002\u8fd9\u6837\u4f1a\u51cf\u5c11\u56e0\u4e3a\u7c7b\u578b\u4e0d\u4e00\u81f4\u800c\u989d\u5916\u589e\u52a0\u7684\u7c7b\u578b\u8f6c\u6362\u64cd\u4f5c\u3002<\/p>\n

5\u3001\u4f7f\u7528SqlDataReader\u83b7\u53d6\u591a\u6761\u8bb0\u5f55\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u8bbf\u95ee\u5230\u53d6\u51fa\u8bb0\u5f55\u7684\u672b\u5c3e\u65f6\u60f3\u8981\u5173\u95edSqlDataReader,\u5e94\u8be5\u5148\u8c03\u7528Command\u5bf9\u8c61\u7684Cancel\u65b9\u6cd5\uff0c\u7136\u540e\u518d\u8c03\u7528SqlDataReader\u7684Close\u65b9\u6cd5\u3002Command\u5bf9\u8c61\u7684Cancel\u65b9\u6cd5\u4f7f\u5f97\u6570\u636e\u5e93\u4e0d\u518d\u628aSqlDataReader\u4e2d\u672a\u8bbf\u95ee\u7684\u6570\u636e\u53d1\u9001\u5230\u8c03\u7528\u7aef\uff0c\u5982\u679c\u4e0d\u8c03\u7528\u6b64\u65b9\u6cd5\u76f4\u63a5\u5173\u95edSqlDataReader\uff0c\u6570\u636e\u5e93\u4f1a\u53d1\u9001\u548cSqlDataReader\u672a\u8bbf\u95ee\u6570\u636e\u7b49\u957f\u7684\u7a7a\u6570\u636e\u6d41\u5230\u8c03\u7528\u7aef\u3002<\/p>\n

6\u3001\u5982\u679c\u60f3\u901a\u8fc7SqlCommand\u7684ExecuteReader\u65b9\u6cd5\u83b7\u53d6\u5b58\u50a8\u8fc7\u7a0b\u7684\u8fd4\u56de\u503c\u6216\u8005\u8f93\u51fa\u53c2\u6570\uff0c\u5fc5\u987b\u5148\u8c03\u7528SqlDataReader\u7684Close\u65b9\u6cd5\u540e\uff0c\u624d\u80fd\u83b7\u53d6\u8f93\u51fa\u53c2\u6570\u7684\u503c\u6216\u8005\u8fd4\u56de\u503c\u3002<\/p>\n

7\u3001\u5982\u679c\u4f7f\u7528SqlDataReader\u53ea\u8fd4\u56de\u4e00\u6761\u8bb0\u5f55\uff0c\u90a3\u4e48\u5728\u8c03\u7528Command\u7684ExecuteReader\u65b9\u6cd5\u65f6\uff0c\u6307\u5b9a
\nCommandBehavior.SingleRow\u53c2\u6570\uff0c\u8fd9\u4e2a\u53c2\u6570\u7684\u662f\u5426\u4f7f\u7528\u5bf9SQL Server .NET Data Provider\u6ca1\u6709\u4ec0\u4e48\u5f71\u54cd\uff0c\u4f46\u662f\u5f53\u4f60\u4f7f\u7528OLE DB .NET Data Provider\u65f6\uff0c\u6307\u5b9a\u8fd9\u4e2a\u53c2\u6570\u540e\uff0cDataPrivider\u5185\u90e8\u5c06\u4f7f\u7528IRow\u63a5\u53e3\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u76f8\u5bf9\u6765\u8bf4\u8017\u8d39\u8d44\u6e90\u7684IRowSet\u63a5\u53e3\u3002<\/p>\n

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