{"id":1869,"date":"2022-11-28T21:36:41","date_gmt":"2022-11-28T13:36:41","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1869"},"modified":"2022-11-28T21:36:41","modified_gmt":"2022-11-28T13:36:41","slug":"%e5%8d%87%e7%ba%a7%e4%bb%a5%e5%90%8e%e7%9a%84dao%e5%8f%8a%e7%9b%b8%e5%85%b3%e7%b1%bb%e7%9a%84%e6%b5%8b%e8%af%95","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1869","title":{"rendered":"\u5347\u7ea7\u4ee5\u540e\u7684DAO\u53ca\u76f8\u5173\u7c7b\u7684\u6d4b\u8bd5"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P45.dao;\r\n\r\nimport java.lang.reflect.Field;\r\nimport java.lang.reflect.ParameterizedType;\r\nimport java.lang.reflect.Type;\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.ArrayList;\r\nimport java.util.List;\r\n\r\nimport top.qaqaq.P35.util.JDBCUtils;\r\n\r\n\/*\r\n * DAO:\tdata(base) access object\r\n * \u5c01\u88c5\u4e86\u9488\u5bf9\u4e8e\u6570\u636e\u8868\u7684\u901a\u7528\u7684\u64cd\u4f5c\r\n * \r\n *\/\r\npublic abstract class BaseDAO&lt;T> {\r\n\t\r\n\tprivate Class&lt;T> clazz = null;\r\n\t\r\n\/\/\tpublic BaseDAO() {\r\n\/\/\t\t\r\n\/\/\t}\r\n\r\n\t{\r\n\t\t\/\/\u83b7\u53d6\u5f53\u524dBaseDAO\u7684\u5b50\u7c7b\u7ee7\u627f\u7684\u7236\u7c7b\u4e2d\u7684\u6cdb\u578b\r\n\t\tType genericSuperclass = this.getClass().getGenericSuperclass();\r\n\t\tParameterizedType paramType = (ParameterizedType) genericSuperclass;\r\n\t\t\r\n\t\tType&#91;] typeArguments = paramType.getActualTypeArguments();\r\n\t\tclazz = (Class&lt;T>) typeArguments&#91;0];\/\/\u6cdb\u578b\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\r\n\t\t\r\n\t}\r\n\t\r\n\t\/\/ \u901a\u7528\u7684\u589e\u5220\u6539\u64cd\u4f5c --version 2.0 (\u8003\u8651\u4e0a\u4e8b\u52a1)\r\n\tpublic int update(Connection conn, 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\tPreparedStatement ps = null;\r\n\t\ttry {\r\n\t\t\t\/\/ 1.\u9884\u7f16\u8bd1sql\u8bed\u53e5\uff0c\u8fd4\u56dePreparedStatement\u5b9e\u4f8b\r\n\t\t\tps = conn.prepareStatement(sql);\r\n\t\t\t\/\/ 2.\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\/\/ 3.\u6267\u884c\r\n\t\t\treturn ps.executeUpdate();\r\n\t\t} catch (Exception e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\r\n\t\t\t\/\/ \u4fee\u6539\u5176\u4e3a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\r\n\t\t\t\/\/ \u4e3b\u8981\u9488\u5bf9\u4e8e\u4f7f\u7528\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u7684\u4f7f\u7528\r\n\/\/\t\t\t\ttry {\r\n\/\/\t\t\t\t\tconn.setAutoCommit(true);\r\n\/\/\t\t\t\t} catch (SQLException e) {\r\n\/\/\t\t\t\t\te.printStackTrace();\r\n\/\/\t\t\t\t}\r\n\r\n\t\t\t\/\/ 4.\u8d44\u6e90\u7684\u5173\u95ed\r\n\t\t\tJDBCUtils.closeResource(null, ps);\r\n\t\t}\r\n\r\n\t\treturn 0;\r\n\t}\r\n\r\n\t\/\/ \u901a\u7528\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u7528\u4e8e\u8fd4\u56de\u6570\u636e\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55(varsion 2.0,\u8003\u8651\u4e0a\u4e8b\u52a1)\r\n\tpublic T getInstance(Connection conn, String sql, Object... args) {\r\n\t\tPreparedStatement ps = null;\r\n\t\tResultSet rs = null;\r\n\t\ttry {\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\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\t\tJDBCUtils.closeResource(null, ps, rs);\r\n\t\t}\r\n\r\n\t\treturn null;\r\n\t}\r\n\r\n\t\/\/ \u901a\u7528\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u7528\u4e8e\u8fd4\u56de\u6570\u636e\u8868\u4e2d\u591a\u6761\u8bb0\u5f55\u6784\u6210\u7684\u96c6\u5408(varsion 2.0,\u8003\u8651\u4e0a\u4e8b\u52a1)\r\n\tpublic List&lt;T> getForList(Connection conn, String sql, Object... args) {\r\n\t\tPreparedStatement ps = null;\r\n\t\tResultSet rs = null;\r\n\t\ttry {\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\t\t\t\/\/ \u521b\u5efa\u96c6\u5408\u5bf9\u8c61\r\n\t\t\tArrayList&lt;T> list = new ArrayList&lt;T>();\r\n\t\t\twhile (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:\u7ed9t\u5bf9\u8c61\u6307\u5b9a\u7684\u5c5e\u6027\u8d4b\u503c\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\tlist.add(t);\r\n\t\t\t}\r\n\r\n\t\t\treturn list;\r\n\t\t} catch (Exception e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\tJDBCUtils.closeResource(null, ps, rs);\r\n\t\t}\r\n\r\n\t\treturn null;\r\n\t}\r\n\r\n\t\/\/\u7528\u4e8e\u67e5\u8be2\u7279\u6b8a\u503c\u7684\u901a\u7528\u7684\u65b9\u6cd5\r\n\tpublic &lt;E> E getValue(Connection conn, String sql, Object... args) {\r\n\t\tPreparedStatement ps = null;\r\n\t\tResultSet rs = null;\r\n\t\ttry {\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\trs = ps.executeQuery();\r\n\t\t\tif(rs.next()) {\r\n\t\t\t\treturn (E) rs.getObject(1);\r\n\t\t\t}\r\n\t\t} catch (SQLException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\tJDBCUtils.closeResource(null, ps, rs);\r\n\t\t}\r\n\t\t\r\n\t\treturn null;\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P45.dao;\r\n\r\nimport java.sql.Connection;\r\nimport java.sql.Date;\r\nimport java.util.List;\r\n\r\nimport top.qaqaq.P43.bean.Customer;\r\n\r\n\/*\r\n * \u6b64\u63a5\u53e3\u7528\u4e8e\u89c4\u8303\u9488\u5bf9\u4e8ecustomers\u8868\u7684\u5e38\u7528\u64cd\u4f5c\r\n *\/\r\npublic interface CustomerDAO {\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u5c06cust\u5bf9\u8c61\u6dfb\u52a0\u5230\u6570\u636e\u5e93\u4e2d\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:20:36\r\n\t * @param conn\r\n\t * @param cust\r\n\t *\/\r\n\tvoid insert(Connection conn, Customer cust);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u9488\u5bf9\u6307\u5b9a\u7684id\uff0c\u5220\u9664\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:21:29\r\n\t * @param conn\r\n\t * @param id\r\n\t *\/\r\n\tvoid deleteById(Connection conn, int id);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u9488\u5bf9\u5185\u5b58\u4e2d\u7684cust\u5bf9\u8c61\uff0c\u53bb\u4fee\u6539\u6570\u636e\u8868\u4e2d\u6307\u5b9a\u7684\u8bb0\u5f55\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:23:35\r\n\t * @param conn\r\n\t * @param cust\r\n\t *\/\r\n\tvoid update(Connection conn, Customer cust);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u9488\u5bf9\u6307\u5b9a\u7684id\u67e5\u8be2\u5f97\u5230\u5bf9\u5e94\u7684Customer\u5bf9\u8c61\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:24:38\r\n\t * @param conn\r\n\t * @param id\r\n\t *\/\r\n\tCustomer getCustomerById(Connection conn, int id);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u67e5\u8be2\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u6784\u6210\u7684\u96c6\u5408\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:25:41\r\n\t * @param conn\r\n\t * @return\r\n\t *\/\r\n\tList&lt;Customer> getAll(Connection conn);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u8fd4\u56de\u6570\u636e\u8868\u4e2d\u7684\u6570\u636e\u7684\u6761\u76ee\u6570\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:26:57\r\n\t * @param conn\r\n\t * @return\r\n\t *\/\r\n\tLong getCount(Connection conn);\r\n\r\n\t\/**\r\n\t * \r\n\t * @Description \u8fd4\u56de\u6570\u636e\u8868\u4e2d\u6700\u5927\u7684\u751f\u65e5\r\n\t * @author RichieZhang\r\n\t * @date 2022\u5e7411\u670828\u65e5\u4e0b\u53482:28:35\r\n\t * @param conn\r\n\t * @return\r\n\t *\/\r\n\tDate getMaxBirth(Connection conn);\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P45.dao;\r\n\r\nimport java.lang.reflect.ParameterizedType;\r\nimport java.lang.reflect.Type;\r\nimport java.sql.Connection;\r\nimport java.sql.Date;\r\nimport java.util.List;\r\n\r\nimport top.qaqaq.P45.dao.BaseDAO;\r\nimport top.qaqaq.P43.bean.Customer;\r\n\r\npublic class CustomerDAOImpl extends BaseDAO&lt;Customer> implements CustomerDAO {\r\n\r\n\t@Override\r\n\tpublic void insert(Connection conn, Customer cust) {\r\n\t\t\r\n\t\tString sql = \"insert into customers(name,email,birth) values(?,?,?) \";\r\n\t\t\r\n\t\tupdate(conn, sql, cust.getName(),cust.getEmail(),cust.getBirth());\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void deleteById(Connection conn, int id) {\r\n\r\n\t\tString sql = \"delete from customers where id = ?\";\r\n\r\n\t\tupdate(conn, sql, id);\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void update(Connection conn, Customer cust) {\r\n\r\n\t\tString sql = \"update customers set name = ?,email = ?, birth = ? where id = ?\";\r\n\r\n\t\tupdate(conn, sql, cust.getName(), cust.getEmail(), cust.getBirth(), cust.getId());\r\n\t}\r\n\r\n\t@Override\r\n\tpublic Customer getCustomerById(Connection conn, int id) {\r\n\r\n\t\tString sql = \"select id,name,email,birth from customers where id = ?\";\r\n\r\n\t\tCustomer customer = getInstance(conn, sql, id);\r\n\r\n\t\treturn customer;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic List&lt;Customer> getAll(Connection conn) {\r\n\r\n\t\tString sql = \"select id,name,email,birth from customers \";\r\n\r\n\t\tList&lt;Customer> list = getForList(conn, sql);\r\n\r\n\t\treturn list;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic Long getCount(Connection conn) {\r\n\r\n\t\tString sql = \"select count(*) from customers\";\r\n\r\n\t\treturn getValue(conn, sql);\r\n\t}\r\n\r\n\t@Override\r\n\tpublic Date getMaxBirth(Connection conn) {\r\n\t\t\r\n\t\tString sql = \"select max(birth) from customers\";\r\n\t\t\r\n\t\treturn getValue(conn, sql);\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P45.dao.junit;\r\n\r\nimport static org.junit.jupiter.api.Assertions.*;\r\n\r\nimport java.sql.Connection;\r\nimport java.sql.Date;\r\nimport java.text.SimpleDateFormat;\r\nimport java.util.List;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport top.qaqaq.P35.util.JDBCUtils;\r\nimport top.qaqaq.P43.bean.Customer;\r\nimport top.qaqaq.P45.dao.CustomerDAOImpl;\r\n\r\nclass CustomerDAOImplTest {\r\n\t\r\n\tprivate CustomerDAOImpl dao = new CustomerDAOImpl();\r\n\r\n\t@Test\r\n\tvoid testInsert() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tCustomer cust = new Customer(1, \"\u5f20\u5c0f\u98de\", \"xiaofei@126.com\", new Date(42131114141214L));\r\n\t\t\tdao.insert(conn, cust);\r\n\t\t\t\r\n\t\t\tSystem.out.println(\"\u6dfb\u52a0\u6210\u529f\");\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testDeleteById() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tdao.deleteById(conn, 13);\r\n\t\t\t\r\n\t\t\tSystem.out.println(\"\u5220\u9664\u6210\u529f\");\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testUpdateConnectionCustomer() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tSimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM-dd\");\r\n\t\t\tjava.util.Date birth = sdf.parse(\"2000-01-01\");\r\n\t\t\t\r\n\t\t\tCustomer cust = new Customer(18,\"\u8d1d\u591a\u82ac\",\"beiduofen@126.com\",new Date(birth.getTime()));\r\n\t\t\tdao.update(conn, cust);\r\n\t\t\t\r\n\t\t\tSystem.out.println(\"\u4fee\u6539\u6210\u529f\");\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testGetCustomerById() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tCustomer cust = dao.getCustomerById(conn, 19);\r\n\t\t\t\r\n\t\t\tSystem.out.println(cust);\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testGetAll() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tList&lt;Customer> list = dao.getAll(conn);\r\n\t\t\t\r\n\t\t\tlist.forEach(System.out::println);\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testGetCount() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tLong count = dao.getCount(conn);\r\n\t\t\t\r\n\t\t\tSystem.out.println(\"\u8868\u4e2d\u7684\u8bb0\u5f55\u6570\u4e3a\uff1a\" + count);\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, null);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n\t@Test\r\n\tvoid testGetMaxBirth() {\r\n\t\tConnection conn = null;\r\n\t\ttry {\r\n\t\t\tconn = JDBCUtils.getConnection();\r\n\t\t\t\r\n\t\t\tDate maxBirth = dao.getMaxBirth(conn);\r\n\t\t\t\r\n\t\t\tSystem.out.println(\"\u6700\u5927\u7684\u751f\u65e5\u4e3a\uff1a\" + maxBirth);\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, null);\r\n\t\t}\r\n\t\t\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-1869","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\/1869"}],"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=1869"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1869\/revisions"}],"predecessor-version":[{"id":1870,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1869\/revisions\/1870"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1869"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1869"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1869"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}