{"id":1823,"date":"2022-11-27T23:19:52","date_gmt":"2022-11-27T15:19:52","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1823"},"modified":"2022-11-27T23:19:53","modified_gmt":"2022-11-27T15:19:53","slug":"%e8%af%be%e5%90%8e%e7%bb%83%e4%b9%a02%ef%bc%9a%e6%b7%bb%e5%8a%a0%e5%9b%9b%e5%85%ad%e7%ba%a7%e6%88%90%e7%bb%a9%e3%80%81%e8%af%be%e5%90%8e%e7%bb%83%e4%b9%a02%ef%bc%9a%e6%9f%a5%e8%af%a2%e8%80%83%e8%af%95","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1823","title":{"rendered":"\u8bfe\u540e\u7ec3\u4e602\uff1a\u6dfb\u52a0\u56db\u516d\u7ea7\u6210\u7ee9\u3001\u8bfe\u540e\u7ec3\u4e602\uff1a\u67e5\u8be2\u8003\u8bd5\u7ed3\u679c\u3001\u8bfe\u540e\u7ec3\u4e602\uff1a\u5220\u9664\u8003\u8bd5\u6570\u636e"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P26.exer;\r\n\r\nimport java.lang.reflect.Field;\r\nimport java.sql.Connection;\r\nimport java.sql.PreparedStatement;\r\nimport java.sql.ResultSet;\r\nimport java.sql.ResultSetMetaData;\r\nimport java.sql.SQLException;\r\nimport java.util.Scanner;\r\n\r\nimport org.junit.Test;\r\n\r\nimport top.qaqaq.P14.util.JDBCUtils;\r\n\r\npublic class Exer2Test {\r\n\r\n\t\/\/ \u95ee\u98981\uff1a\u5411examstudent\u8868\u4e2d\u6dfb\u52a0\u4e00\u6761\u8bb0\u5f55\r\n\t\/*\r\n\t * Type: \r\n\t * IDCard: \r\n\t * ExamCard: \r\n\t * StudentName: \r\n\t * Location: \r\n\t * Grade:\r\n\t *\/\r\n\t@Test\r\n\tpublic void testInsert() {\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tSystem.out.print(\"\u56db\u7ea7\/\u516d\u7ea7\uff1a\");\r\n\t\tint type = scanner.nextInt();\r\n\t\tSystem.out.print(\"\u8eab\u4efd\u8bc1\u53f7\uff1a\");\r\n\t\tString IDCard = scanner.next();\r\n\t\tSystem.out.print(\"\u51c6\u8003\u8bc1\u53f7\uff1a\");\r\n\t\tString examCard = scanner.next();\r\n\t\tSystem.out.print(\"\u5b66\u751f\u59d3\u540d\uff1a\");\r\n\t\tString studentName = scanner.next();\r\n\t\tSystem.out.print(\"\u6240\u5728\u57ce\u5e02\uff1a\");\r\n\t\tString location = scanner.next();\r\n\t\tSystem.out.print(\"\u8003\u8bd5\u6210\u7ee9\uff1a\");\r\n\t\tint grade = scanner.nextInt();\r\n\t\t\r\n\t\tString sql = \"insert into examstudent(type,IDCard,examCard,studentName,location,grade) values(?,?,?,?,?,?)\";\r\n\t\t\r\n\t\tint insertCount = update(sql,type,IDCard,examCard,studentName,location,grade);\r\n\t\tif(insertCount > 0) {\r\n\t\t\tSystem.out.println(\"\u6dfb\u52a0\u6210\u529f\");\r\n\t\t}else {\r\n\t\t\tSystem.out.println(\"\u6dfb\u52a0\u5931\u8d25\");\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t\/\/ \u901a\u7528\u7684\u589e\u5220\u6539\u64cd\u4f5c\r\n\tpublic int update(String sql, Object... args) {\/\/ sql\u4e2d\u5360\u4f4d\u7b26\u7684\u4e2a\u6570\u4e0e\u53ef\u53d8\u5f62\u53c2\u7684\u957f\u5ea6\u76f8\u540c\uff01\r\n\t\tConnection conn = null;\r\n\t\tPreparedStatement ps = null;\r\n\t\ttry {\r\n\t\t\t\/\/ 1.\u83b7\u53d6\u6570\u636e\u5e93\u7684\u8fde\u63a5\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\/\/ 2.\u9884\u7f16\u8bd1sql\u8bed\u53e5\uff0c\u8fd4\u56dePreparedStatement\u5b9e\u4f8b\r\n\t\t\tps = conn.prepareStatement(sql);\r\n\t\t\t\/\/ 3.\u586b\u5145\u5360\u4f4d\u7b26\r\n\t\t\tfor (int i = 0; i &lt; args.length; i++) {\r\n\t\t\t\tps.setObject(i + 1, args&#91;i]);\/\/ \u5c0f\u5fc3\u53c2\u6570\u58f0\u660e\u9519\u8bef\uff01\uff01\r\n\t\t\t}\r\n\t\t\t\/\/ 4.\u6267\u884c\r\n\t\t\t\/*\r\n\t\t\t * ps.execute(); \r\n\t\t\t * \u5982\u679c\u6267\u884c\u7684\u662f\u67e5\u8be2\u64cd\u4f5c\uff0c\u6709\u8fd4\u56de\u7ed3\u679c\uff0c\u5219\u6b64\u65b9\u6cd5\u8fd4\u56detrue; \r\n\t\t\t * \u5982\u679c\u6267\u884c\u7684\u662f\u589e\u3001\u5220\u3001\u6539\u64cd\u4f5c\uff0c\u6ca1\u6709\u8fd4\u56de\u7ed3\u679c\uff0c\u5219\u6b64\u65b9\u6cd5\u8fd4\u56defalse.\r\n\t\t\t *\/\r\n\t\t\t\/\/ \u65b9\u5f0f\u4e00\uff1a\r\n\/\/\t\t\t\treturn ps.execute();\r\n\t\t\t\/\/ \u65b9\u5f0f\u4e8c\uff1a\r\n\t\t\treturn ps.executeUpdate();\r\n\t\t} catch (SQLException e) {\r\n\t\t\t\/\/ TODO Auto-generated catch block\r\n\t\t\te.printStackTrace();\r\n\t\t} catch (Exception e) {\r\n\t\t\t\/\/ TODO Auto-generated catch block\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\t\/\/ 5.\u8d44\u6e90\u7684\u5173\u95ed\r\n\t\t\tJDBCUtils.closeResource(conn, ps);\r\n\t\t}\r\n\r\n\t\treturn 0;\r\n\t}\r\n\t\r\n\t\/\/\u95ee\u98982\uff1a\u6839\u636e\u8eab\u4efd\u8bc1\u53f7\u6216\u8005\u51c6\u8003\u8bc1\u53f7\u67e5\u8be2\u5b66\u751f\u6210\u7ee9\u4fe1\u606f\r\n\t@SuppressWarnings(\"resource\")\r\n\t@Test\r\n\tpublic void queryWithIDCardOrExamCard() {\r\n\t\tSystem.out.println(\"\u8bf7\u9009\u62e9\u60a8\u8981\u8f93\u5165\u7684\u7c7b\u578b\uff1a\");\r\n\t\tSystem.out.println(\"a.\u51c6\u8003\u8bc1\u53f7\");\r\n\t\tSystem.out.println(\"b.\u8eab\u4efd\u8bc1\u53f7\");\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tString selection = scanner.next();\r\n\t\tif(\"a\".equalsIgnoreCase(selection)){\/\/if(selection.equalsIgnoreCase(\"a\")) {\r\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u51c6\u8003\u8bc1\u53f7\uff1a\");\r\n\t\t\tString examCard = scanner.next();\r\n\t\t\tString sql = \"select FlowID flowID,Type type,IDCard,ExamCard examCard,StudentName name,Location location,Grade grade from examstudent where examCard = ?\";\r\n\t\t\t\r\n\t\t\tStudent student = getInstance(Student.class, sql, examCard);\r\n\t\t\tif(student != null) {\r\n\t\t\t\tSystem.out.println(student);\r\n\t\t\t}else {\r\n\t\t\t\tSystem.out.println(\"\u8f93\u5165\u7684\u51c6\u8003\u8bc1\u53f7\u6709\u8bef\uff01\");\r\n\t\t\t}\r\n\t\t\t\r\n\t\t}else if(\"b\".equalsIgnoreCase(selection)) {\r\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u8eab\u4efd\u8bc1\u53f7\uff1a\");\r\n\t\t\tString IDCard = scanner.next();\r\n\t\t\tString sql = \"select FlowID flowID,Type type,IDCard,ExamCard examCard,StudentName name,Location location,Grade grade from examstudent where IDCard = ?\";\r\n\t\t\t\r\n\t\t\tStudent student = getInstance(Student.class, sql, IDCard);\r\n\t\t\tif(student != null) {\r\n\t\t\t\tSystem.out.println(student);\r\n\t\t\t}else {\r\n\t\t\t\tSystem.out.println(\"\u8f93\u5165\u7684\u8eab\u4efd\u8bc1\u53f7\u6709\u8bef\uff01\");\r\n\t\t\t}\r\n\t\t}else {\r\n\t\t\tSystem.out.println(\"\u60a8\u7684\u8f93\u5165\u6709\u8bef\uff0c\u8bf7\u91cd\u65b0\u8fdb\u5165\u7a0b\u5e8f\u3002\");\r\n\t\t}\r\n\t\t\r\n\t}\r\n\t\r\n\r\n\tpublic &lt;T> T getInstance(Class&lt;T> clazz, String sql, Object... args) {\r\n\t\tConnection conn = null;\r\n\t\tPreparedStatement ps = null;\r\n\t\tResultSet rs = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\r\n\t\t\tps = conn.prepareStatement(sql);\r\n\t\t\tfor (int i = 0; i &lt; args.length; i++) {\r\n\t\t\t\tps.setObject(i + 1, args&#91;i]);\r\n\t\t\t}\r\n\r\n\t\t\trs = ps.executeQuery();\r\n\t\t\t\/\/ \u83b7\u53d6\u7ed3\u679c\u96c6\u7684\u5143\u6570\u636e : ResultSetMetaData\r\n\t\t\tResultSetMetaData rsmd = rs.getMetaData();\r\n\t\t\t\/\/ \u901a\u8fc7ResultSetMetaData\u83b7\u53d6\u7ed3\u679c\u96c6\u4e2d\u7684\u5217\u6570\r\n\t\t\tint columnCount = rsmd.getColumnCount();\r\n\r\n\t\t\tif (rs.next()) {\r\n\t\t\t\tT t = clazz.newInstance();\r\n\t\t\t\t\/\/ \u5904\u7406\u7ed3\u679c\u96c6\u4e00\u884c\u6570\u636e\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5217\r\n\t\t\t\tfor (int i = 0; i &lt; columnCount; i++) {\r\n\t\t\t\t\t\/\/ \u83b7\u53d6\u5217\u503c\r\n\t\t\t\t\tObject columnvalue = rs.getObject(i + 1);\r\n\r\n\t\t\t\t\t\/\/ \u83b7\u53d6\u6bcf\u4e2a\u5217\u7684\u5217\u540d\r\n\/\/\t\t\t\t\tString columnName = rsmd.getColumnName(i + 1);\r\n\t\t\t\t\tString columnLabel = rsmd.getColumnLabel(i + 1);\r\n\r\n\t\t\t\t\t\/\/ \u7ed9t\u5bf9\u8c61\u6307\u5b9a\u7684columnName\u5c5e\u6027\uff0c\u8d4b\u503c\u4e3acolumnvalue\uff1b\u901a\u8fc7\u53cd\u5c04\r\n\t\t\t\t\tField field = clazz.getDeclaredField(columnLabel);\r\n\t\t\t\t\tfield.setAccessible(true);\r\n\t\t\t\t\tfield.set(t, columnvalue);\r\n\r\n\t\t\t\t}\r\n\t\t\t\treturn t;\r\n\t\t\t}\r\n\t\t} catch (Exception e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\tJDBCUtils.closeResource(conn, ps, rs);\r\n\t\t}\r\n\r\n\t\treturn null;\r\n\t}\r\n\t\r\n\t\/\/\u95ee\u98983\uff1a\u5220\u9664\u6307\u5b9a\u7684\u5b66\u751f\u4fe1\u606f\r\n\t@Test\r\n\tpublic void testDeleteByExamCard() {\r\n\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u5b66\u751f\u7684\u8003\u53f7\uff1a\");\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tString examCard = scanner.next();\r\n\t\t\/\/\u67e5\u8be2\u6307\u5b9a\u51c6\u8003\u8bc1\u53f7\u7684\u5b66\u751f\r\n\t\tString sql = \"select FlowID flowID,Type type,IDCard,ExamCard examCard,StudentName name,Location location,Grade grade from examstudent where examCard = ?\";\r\n\t\tStudent student = getInstance(Student.class, sql, examCard);\r\n\t\tif(student == null) {\r\n\t\t\tSystem.out.println(\"\u67e5\u65e0\u6b64\u4eba\uff0c\u8bf7\u91cd\u65b0\u8f93\u5165\");\r\n\t\t}else {\r\n\t\t\tString sql1 = \"delete from examstudent where examCard = ?\";\r\n\t\t\tint deleteCount = update(sql1,examCard);\r\n\t\t\tif(deleteCount > 0) {\r\n\t\t\t\tSystem.out.println(\"\u5220\u9664\u6210\u529f\");\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\t\r\n\t\/\/\u4f18\u5316\u4ee5\u540e\u7684\u64cd\u4f5c\uff1a\r\n\t@Test\r\n\tpublic void testDeleteByTxamCard1() {\r\n\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u5b66\u751f\u7684\u8003\u53f7\uff1a\");\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tString examCard = scanner.next();\r\n\t\tString sql1 = \"delete from examstudent where examCard = ?\";\r\n\t\tint deleteCount = update(sql1,examCard);\r\n\t\tif(deleteCount > 0) {\r\n\t\t\tSystem.out.println(\"\u5220\u9664\u6210\u529f\");\r\n\t\t}else {\r\n\t\t\tSystem.out.println(\"\u67e5\u65e0\u6b64\u4eba\uff0c\u8bf7\u91cd\u65b0\u8f93\u5165\");\r\n\t\t}\r\n\t\t\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P26.exer;\r\n\r\n\/*\r\n * Type: \r\n * IDCard: \r\n * ExamCard: \r\n * StudentName: \r\n * Location: \r\n * Grade:\r\n *\/\r\npublic class Student {\r\n\r\n\tprivate int flowID; \/\/ \u6d41\u6c34\u53f7\r\n\tprivate int type; \/\/ \u8003\u8bd5\u7c7b\u578b\r\n\tprivate String IDCard; \/\/ \u8eab\u4efd\u8bc1\u53f7\r\n\tprivate String examCard; \/\/ \u51c6\u8003\u8bc1\u53f7\r\n\tprivate String name; \/\/ \u5b66\u751f\u59d3\u540d\r\n\tprivate String location; \/\/ \u6240\u5728\u57ce\u5e02\r\n\tprivate int grade; \/\/ \u6210\u7ee9\r\n\r\n\tpublic Student() {\r\n\t}\r\n\r\n\tpublic Student(int flowID, int type, String iDCard, String examCard, String name, String location, int grade) {\r\n\t\tthis.flowID = flowID;\r\n\t\tthis.type = type;\r\n\t\tIDCard = iDCard;\r\n\t\tthis.examCard = examCard;\r\n\t\tthis.name = name;\r\n\t\tthis.location = location;\r\n\t\tthis.grade = grade;\r\n\t}\r\n\r\n\tpublic int getType() {\r\n\t\treturn type;\r\n\t}\r\n\r\n\tpublic void setType(int type) {\r\n\t\tthis.type = type;\r\n\t}\r\n\r\n\tpublic String getIDCard() {\r\n\t\treturn IDCard;\r\n\t}\r\n\r\n\tpublic void setIDCard(String iDCard) {\r\n\t\tIDCard = iDCard;\r\n\t}\r\n\r\n\tpublic String getExamCard() {\r\n\t\treturn examCard;\r\n\t}\r\n\r\n\tpublic void setExamCard(String examCard) {\r\n\t\tthis.examCard = examCard;\r\n\t}\r\n\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\tpublic String getLocation() {\r\n\t\treturn location;\r\n\t}\r\n\r\n\tpublic void setLocation(String location) {\r\n\t\tthis.location = location;\r\n\t}\r\n\r\n\tpublic int getGrade() {\r\n\t\treturn grade;\r\n\t}\r\n\r\n\tpublic void setGrade(int grade) {\r\n\t\tthis.grade = grade;\r\n\t}\r\n\r\n\tpublic int getFlowID() {\r\n\t\treturn flowID;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\tSystem.out.println(\"==========\u67e5\u8be2\u7ed3\u679c==========\");\r\n\t\treturn info();\r\n\t}\r\n\r\n\tprivate String info() {\r\n\t\treturn \"\u6d41\u6c34\u53f7\uff1a\" + flowID + \"\\n\u56db\u7ea7\/\u516d\u7ea7\uff1a\" + type + \"\\n\u8eab\u4efd\u8bc1\u53f7\uff1a\" + IDCard + \"\\n\u51c6\u8003\u8bc1\u53f7\uff1a\" + examCard +\r\n\t\t\t\t\"\\n\u5b66\u751f\u59d3\u540d\uff1a\" + name + \"\\n\u533a\u57df\uff1a\" + location + \"\\n\u6210\u7ee9\uff1a\" + grade;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[48],"class_list":["post-1823","post","type-post","status-publish","format-standard","hentry","category-jdbc-code","tag-jdbc"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1823"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1823"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1823\/revisions"}],"predecessor-version":[{"id":1824,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1823\/revisions\/1824"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}