{"id":1782,"date":"2022-11-26T22:30:14","date_gmt":"2022-11-26T14:30:14","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1782"},"modified":"2022-11-27T12:40:30","modified_gmt":"2022-11-27T04:40:30","slug":"%e9%92%88%e5%af%b9order%e8%a1%a8%e7%9a%84%e9%80%9a%e7%94%a8%e7%9a%84%e6%9f%a5%e8%af%a2%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1782","title":{"rendered":"\u9488\u5bf9Order\u8868\u7684\u901a\u7528\u7684\u67e5\u8be2\u64cd\u4f5c"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P19.preparedstatement.crud;\r\n\r\nimport java.lang.reflect.Field;\r\nimport java.sql.Connection;\r\nimport java.sql.Date;\r\nimport java.sql.PreparedStatement;\r\nimport java.sql.ResultSet;\r\nimport java.sql.ResultSetMetaData;\r\nimport java.sql.SQLException;\r\n\r\nimport org.junit.Test;\r\n\r\nimport top.qaqaq.P14.util.JDBCUtils;\r\nimport top.qaqaq.P19.bean.Order;\r\n\r\n\/**\r\n * \r\n* @Description\t\u9488\u5bf9\u4e8eOrder\u8868\u7684\u901a\u7528\u7684\u67e5\u8be2\u64cd\u4f5c\r\n* @author RichieZhang Email:18358892@qq.com\r\n* @version\r\n* @date 2022\u5e7411\u670826\u65e5\u4e0b\u53487:08:07\r\n*\r\n *\/\r\npublic class OrderForQuery {\r\n\t\r\n\t\/*\r\n\t * \u9488\u5bf9\u4e8e\u8868\u7684\u5b57\u6bb5\u540d\u4e0e\u7c7b\u7684\u5c5e\u6027\u540d\u4e0d\u76f8\u540c\u7684\u60c5\u51b5\uff1a\r\n\t * 1. \u5fc5\u987b\u58f0\u660esql\u65f6\uff0c\u4f7f\u7528\u7c7b\u7684\u5c5e\u6027\u540d\u6765\u547d\u540d\u5b57\u6bb5\u7684\u522b\u540d\r\n\t * 2. \u4f7f\u7528ResultSetMetaData\u65f6\uff0c\u9700\u8981\u4f7f\u7528getColumnLabel()\u6765\u66ff\u6362getColumnName(),\r\n\t * \u83b7\u53d6\u5217\u7684\u522b\u540d\u3002\r\n\t * \t\u8bf4\u660e\uff1a\u5982\u679csql\u4e2d\u6ca1\u6709\u7ed9\u5b57\u6bb5\u8d77\u522b\u540d\uff0cgetColumnLabel()\u83b7\u53d6\u7684\u5c31\u662f\u5217\u540d\r\n\t * \r\n\t *\/\r\n\t\r\n\t@Test\r\n\tpublic void testOrderForQuery() {\r\n\t\tString sql = \"select order_id orderId,order_name orderName,order_date orderDate from `order` where order_id = ?\";\r\n\t\tOrder order = orderForQuery(sql, 1);\r\n\t\tSystem.out.println(order);\r\n\t}\r\n\t\r\n\t\/**\r\n\t * \r\n\t* @Description \t\u901a\u7528\u7684\u9488\u5bf9\u4e8eOrder\u8868\u7684\u67e5\u8be2\u64cd\u4f5c\r\n\t* @author RichieZhang\r\n\t* @date 2022\u5e7411\u670826\u65e5\u4e0b\u53487:22:45\r\n\t* @return\r\n\t * @throws Exception \r\n\t *\/\r\n\tpublic Order orderForQuery(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\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\t\t\t\r\n\t\t\t\/\/\u6267\u884c\uff0c\u83b7\u53d6\u7ed3\u679c\u96c6\r\n\t\t\trs = ps.executeQuery();\r\n\t\t\t\/\/\u83b7\u53d6\u7ed3\u679c\u96c6\u7684\u5143\u6570\u636e\r\n\t\t\tResultSetMetaData rsmd = rs.getMetaData();\r\n\t\t\t\/\/\u83b7\u53d6\u5217\u6570\r\n\t\t\tint columnCount = rsmd.getColumnCount();\r\n\t\t\tif(rs.next()) {\r\n\t\t\t\tOrder order = new Order();\r\n\t\t\t\tfor(int i = 0; i &lt; columnCount; i++) {\r\n\t\t\t\t\t\/\/\u83b7\u53d6\u6bcf\u4e2a\u5217\u7684\u5217\u503c: \u901a\u8fc7ResultSet\r\n\t\t\t\t\tObject columnValue = rs.getObject(i + 1);\r\n\t\t\t\t\t\/\/\u901a\u8fc7ResultSetMetaData\r\n\t\t\t\t\t\/\/\u83b7\u53d6\u5217\u7684\u5217\u540d\uff1agetColumnName()\t--\u4e0d\u63a8\u8350\u4f7f\u7528\r\n\t\t\t\t\t\/\/\u83b7\u53d6\u5217\u7684\u522b\u540d\uff1agetColumnLabel()\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\t\t\t\t\t\r\n\t\t\t\t\t\/\/\u901a\u8fc7\u53cd\u5c04\uff0c\u5c06\u5bf9\u8c61\u6307\u5b9a\u540dcolumnName\u7684\u5c5e\u6027\u8d4b\u503c\u4e3a\u6307\u5b9a\u7684\u503ccolumnValue\r\n\t\t\t\t\tField field = Order.class.getDeclaredField(columnLabel);\r\n\t\t\t\t\tfield.setAccessible(true);\r\n\t\t\t\t\tfield.set(order, columnValue);\r\n\t\t\t\t\t\r\n\t\t\t\t}\r\n\t\t\t\t\r\n\t\t\t\treturn order;\r\n\t\t\t\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\t\t\r\n\t\treturn null;\r\n\t\t\r\n\t}\r\n\t\r\n\t@Test\r\n\tpublic void testQuery1() {\r\n\t\t\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\t\t\tString sql = \"select order_id,order_name,order_date from `order` where order_id = ?\";\r\n\t\t\tps = conn.prepareStatement(sql);\r\n\t\t\tps.setObject(1, 1);\r\n\t\t\t\r\n\t\t\trs = ps.executeQuery();\r\n\t\t\tif(rs.next()) {\r\n\t\t\t\tint id = (int) rs.getObject(1);\r\n\t\t\t\tString name = (String) rs.getObject(2);\r\n\t\t\t\tDate date = (Date) rs.getObject(3);\r\n\t\t\t\t\r\n\t\t\t\tOrder order = new Order(id, name, date);\r\n\t\t\t\tSystem.out.println(order);\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\t\t\r\n\t}\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P19.bean;\r\n\r\nimport java.sql.Date;\r\n\r\npublic class Order {\r\n\r\n\tprivate int orderId;\r\n\tprivate String orderName;\r\n\tprivate Date orderDate;\r\n\r\n\tpublic Order() {\r\n\t}\r\n\r\n\tpublic Order(int orderId, String orderName, Date orderDate) {\r\n\t\tthis.orderId = orderId;\r\n\t\tthis.orderName = orderName;\r\n\t\tthis.orderDate = orderDate;\r\n\t}\r\n\r\n\tpublic int getOrderId() {\r\n\t\treturn orderId;\r\n\t}\r\n\r\n\tpublic void setOrderId(int orderId) {\r\n\t\tthis.orderId = orderId;\r\n\t}\r\n\r\n\tpublic String getOrderName() {\r\n\t\treturn orderName;\r\n\t}\r\n\r\n\tpublic void setOrderName(String orderName) {\r\n\t\tthis.orderName = orderName;\r\n\t}\r\n\r\n\tpublic Date getOrderDate() {\r\n\t\treturn orderDate;\r\n\t}\r\n\r\n\tpublic void setOrderDate(Date orderDate) {\r\n\t\tthis.orderDate = orderDate;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"Order &#91;orderId=\" + orderId + \", orderName=\" + orderName + \", orderDate=\" + orderDate + \"]\";\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\n\n\n<p><\/p>\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-1782","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\/1782"}],"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=1782"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1782\/revisions"}],"predecessor-version":[{"id":1783,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1782\/revisions\/1783"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1782"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1782"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}