{"id":145862,"date":"2021-11-12T12:34:52","date_gmt":"2021-11-12T04:34:52","guid":{"rendered":"http:\/\/www.idc.net\/help\/145862\/"},"modified":"2021-11-12T12:34:52","modified_gmt":"2021-11-12T04:34:52","slug":"sqlite%e6%95%b0%e6%8d%ae%e5%ba%93%e6%b7%bb%e5%8a%a0%e5%ad%97%e6%ae%b5%e6%93%8d%e4%bd%9c%e6%ad%a5%e9%aa%a4%e5%8f%8a%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9-sqlite%e6%95%b0%e6%8d%ae%e5%ba%93%e6%b7%bb","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/145862\/","title":{"rendered":"SQLite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5\u64cd\u4f5c\u6b65\u9aa4\u53ca\u6ce8\u610f\u4e8b\u9879 (sqlite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5)"},"content":{"rendered":"<p>SQLite\u662f\u4e00\u79cd\u8f7b\u578b\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u4ee5\u5176\u5feb\u901f\u800c\u9ad8\u6548\u7684\u8868\u73b0\u548c\u6613\u7528\u6027\u800c\u4eab\u8a89\u5168\u7403\u3002\u5728\u65e5\u5e38\u7684\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5bf9SQLite\u6570\u636e\u5e93\u8fdb\u884c\u64cd\u4f5c\uff0c\u5176\u4e2d\u5305\u62ec\u6dfb\u52a0\u5b57\u6bb5\u3002\u672c\u7bc7\u6587\u7ae0\u5c06\u6df1\u5165\u63a2\u8ba8SQLite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5\u7684\u64cd\u4f5c\u6b65\u9aa4\u53ca\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<p>\u4e00\u3001\u6dfb\u52a0\u5b57\u6bb5\u7684\u64cd\u4f5c\u6b65\u9aa4<\/p>\n<p>\u5728SQLite\u6570\u636e\u5e93\u4e2d\u6dfb\u52a0\u5b57\u6bb5\u975e\u5e38\u65b9\u4fbf\uff0c\u53ea\u9700\u9075\u5faa\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<p>1\u3001\u6253\u5f00SQLite\u6570\u636e\u5e93\uff1a\u4f7f\u7528SQLite\u547d\u4ee4\u884c\u6216SQLite\u53ef\u89c6\u5316\u5de5\u5177\u6253\u5f00\u6570\u636e\u5e93\u3002<\/p>\n<p>2\u3001\u9009\u62e9\u9700\u8981\u6dfb\u52a0\u5b57\u6bb5\u7684\u8868\uff1a\u4f7f\u7528SELECT\u8bed\u53e5\u9009\u62e9\u9700\u8981\u6dfb\u52a0\u5b57\u6bb5\u7684\u8868\u3002<\/p>\n<p>3\u3001\u6267\u884cALTER TABLE\u8bed\u53e5\uff1a\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u6dfb\u52a0\u65b0\u7684\u5b57\u6bb5\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<p>ALTER TABLE \u8868\u540d ADD COLUMN \u65b0\u5b57\u6bb5\u540d \u6570\u636e\u7c7b\u578b;<\/p>\n<p>\u4f8b\u5982\uff0c\u6211\u4eec\u9700\u8981\u5411student\u8868\u4e2d\u6dfb\u52a0\u65b0\u7684\u5b57\u6bb5score\uff0c\u5176\u7c7b\u578b\u4e3a\u6d6e\u70b9\u578b\uff0c\u5219ALTER TABLE\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n<p>ALTER TABLE student ADD COLUMN score REAL;<\/p>\n<p>\u6267\u884c\u5b8cALTER 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NULL\u3001UNIQUE\u3001PRIMARY KEY\u3001FOREIGN 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\u8fde\u63a5\u5b57\u7b26\u4e32 data source=d:\\test.db3;password=1234<\/p>\n<p> SQLiteConnectionStringBuilder connStr = new SQLiteConnectionStringBuilder();<\/p>\n<p> connStr.DataSource = @\u201dd:\\test.db3\u2033;<\/p>\n<p> connStr.Password = \u201c1234\u201d;<\/p>\n<p> conn = new SQLiteConnection(connStr.ToString());<\/p>\n<p> conn.Open();<\/p>\n<p> \/\u8ff9\u795e\u4e4e\/ \u63d2\u5165\u6570\u636e<\/p>\n<p> string SQL = \u201cINSERT INTO test(k) VALUES(:k)\u201d;<\/p>\n<p> SQLiteCommand cmd = conn.CreateCommand();<\/p>\n<p> cmd.CommandText = SQL;<\/p>\n<p> \/\/ \u53d6\u56fe\u6807\uff0c\u51c6\u5907\u63d2\u5165\u5230\u6570\u636e\u5e93BLOB\u5b57\u6bb5<\/p>\n<p> FileStream picStream = File.OpenRead(@\u201d\u59ff\u6089d:\\1.bmp\u201d);<\/p>\n<p> byte bArray = new byte;<\/p>\n<\/p>\n<p> picStream.Read(bArray, 0, bArray.Length);<\/p>\n<p> picStream.Close();<\/p>\n<p> cmd.Parameters.Add(\u201ck\u201d, DbType.Binary).Value = bArray; \/\/ BLOB<\/p>\n<p> cmd.ExecuteNonQuery();<\/p>\n<p> \/\/\u53d6\u51fa\u6570\u636e <\/p>\n<p> cmd.CommandText = \u201cSELECT k FROM test\u201d;<\/p>\n<p> System.Data.SQLite.SQLiteDataReader reader = cmd.ExecuteReader();<\/p>\n<p> while (reader.Read())<\/p>\n<p> {<\/p>\n<p> MemoryStream streamImage = new MemoryStream(reader as byte);<\/p>\n<\/p>\n<p> pictureBox1.Image = Image.FromStream(streamImage);<\/p>\n<p> streamImage.Close(); \/\/\u778e\u7f13 \u5173\u95ed\u6d41<\/p>\n<p> }<\/p>\n<p> reader.close();<\/p>\n<p>sqlite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5\u7684\u4ecb\u7ecd\u5c31\u804a\u5230\u8fd9\u91cc\u5427\uff0c\u611f\u8c22\u4f60\u82b1\u65f6\u95f4\u9605\u8bfb\u672c\u7ad9\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8esqlite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5,SQLite\u6570\u636e\u5e93\u6dfb\u52a0\u5b57\u6bb5\u64cd\u4f5c\u6b65\u9aa4\u53ca\u6ce8\u610f\u4e8b\u9879,\u8bf7\u6559SQLite\u6570\u636e\u5e93\u8bfb\u5199BLOB\u5b57\u6bb5\u7684\u4fe1\u606f\u522b\u5fd8\u4e86\u5728\u672c\u7ad9\u8fdb\u884c\u67e5\u627e\u5594\u3002<\/p>\n<p><a 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[&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-145862","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/145862","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=145862"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/145862\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=145862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=145862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=145862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}