Java如何连接SQLServer,并实现查询、修改、删除方法
场景:A:在UI自动化时,删除数据时候,在界面UI提示“该XX已被使用,无法删除”。 这时候我们有需要做数据初始化的操作,需要把历史数据做删除,来确脚本运行的重复执行,和稳定性质。
B: 在做新增操作时候,需要校验数据是否存在后台。需要校验后台数据。
实现思路:
1.把数据库的连接地址、用户名、密码。 配置在框架配置文件处。
public class Const { public static final String DB_URL = "XXXX"; public static final String DB_DatabaseName = "XXX"; public static final String DB_UserName = "XXX"; public static final String DB_Password = "XXX"; }
2.DBHelper 方法
1 package com.pensee.utils; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 import java.sql.Statement; 8 import com.pensee.config.Const; 9 10 public class DBHelper { 11 static String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; 12 static String url = "jdbc:sqlserver://"+ Const.DB_URL +";DatabaseName="+ Const.DB_DatabaseName +""; 13 static Connection con = null; 14 static Statement st = null; 15 static ResultSet res = null; 16 17 18 public static void dataBase() { 19 try { 20 Class.forName(driver); 21 con = DriverManager.getConnection(url, ""+ Const.DB_UserName +"", ""+ Const.DB_Password +""); 22 } catch (ClassNotFoundException e) { 23 System.err.println("装载 JDBC/ODBC 驱动程序失败。"); 24 e.printStackTrace(); 25 } catch (SQLException e) { 26 System.err.println("无法连接数据库"); 27 e.printStackTrace(); 28 } 29 } 30 31 /** 32 * 查询SQL方法 33 * @param sql 34 * @return 35 * @throws SQLException 36 */ 37 public static ResultSet find(String sql) throws SQLException{//对数据库进行数据查询 38 //获得连接 39 dataBase(); 40 st=con.createStatement(); 41 try { 42 res=st.executeQuery(sql); 43 return res; 44 } catch (SQLException e) { 45 e.printStackTrace(); 46 return null; 47 } 48 49 } 50 /** 51 * SQL删除修改 52 * @param sql 53 * @return 54 * @throws SQLException 55 */ 56 public static boolean update(String sql) throws SQLException{//对增删改 57 //获得连接 58 dataBase(); 59 st = con.createStatement(); 60 try { 61 st.executeUpdate(sql); 62 return true; 63 } catch (SQLException e) { 64 e.printStackTrace(); 65 return false; 66 } 67 } 68 69 }
3. 如何调用DB
String sql = "update hr_staff_policy set HolidayPolicy = 3 where staffno ='0092'"; boolean result = DBHelper.update(sql); Assert.isTrue(result); System.out.println("SQL执行结果为:" +DBHelper.update(sql));
4. 效果图:
框架如何增加JDBC
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
进入sqljdbc4.jar包所在的位置,cmd运行以下命令(即在我们的project 的\lib路径下)
mvn install:install-file -Dfile=sqljdbc4.jar -Dpackaging=jar -DgroupId=com.microsoft.sqlserver -DartifactId=sqljdbc4 -Dversion=4.0
安装成功之后就可以在pom中引用sqljdbc依赖了。(已经加好上传了)
mvn install:install-file -Dfile=sqljdbc4.jar -Dpackaging=jar -DgroupId=com.microsoft.sqlserver -DartifactId=sqljdbc4 -Dversion=4.0
安装成功之后就可以在pom中引用sqljdbc依赖了。(已经加好上传了)
五、 优化后的代码
1 import java.sql.Connection; 2 import java.sql.DriverManager; 3 import java.sql.ResultSet; 4 import java.sql.ResultSetMetaData; 5 import java.sql.SQLException; 6 import java.sql.Statement; 7 import java.util.ArrayList; 8 9 import org.apache.logging.log4j.LogManager; 10 import org.apache.logging.log4j.Logger; 11 12 import com.pensee.config.Const; 13 14 public class DBHelper { 15 private static final Logger logger = LogManager.getLogger(DBHelper.class); 16 17 static String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; 18 static String url = "jdbc:sqlserver://"+ Const.DB_URL +";DatabaseName="+ Const.DB_DatabaseName +""; 19 20 private static Connection getDBConnection() { 21 Connection con = null; 22 try { 23 Class.forName(driver); 24 con = DriverManager.getConnection(url, ""+ Const.DB_UserName + "", ""+ Const.DB_Password +""); 25 } catch (ClassNotFoundException e) { 26 logger.error("装载 JDBC/ODBC 驱动程序失败。"); 27 } catch (SQLException e) { 28 logger.error("无法连接数据库"); 29 } 30 return con; 31 } 32 33 private static void closeConnection(Connection con) { 34 try { 35 con.close(); 36 } catch (SQLException e) { 37 ; 38 } 39 } 40 41 /** 42 * 查询SQL方法 43 * @param sql 44 * @return 45 * @throws SQLException 46 */ 47 public static ArrayList<String> query(String sql) throws SQLException{//对数据库进行数据查询 48 //获得连接 49 Connection con = getDBConnection(); 50 Statement st = con.createStatement(); 51 ResultSet res; 52 try { 53 res = st.executeQuery(sql); 54 } catch (SQLException e) { 55 throw new RuntimeException("查询失败: " + sql); 56 } 57 ArrayList<String> result = new ArrayList<String>(); 58 while(res.next()) { 59 ResultSetMetaData rsmd = res.getMetaData(); 60 int columnCount = rsmd.getColumnCount(); 61 for (int i=0;i<columnCount;i++) { 62 result.add(res.getString(i+1)); 63 } 64 } 65 closeConnection(con); 66 return result; 67 } 68 /** 69 * SQL删除修改 70 * @param sql 71 * @return 72 * @throws SQLException 73 */ 74 public static void updateDB(String sql) throws SQLException{//对增删改 75 //获得连接 76 Connection con = getDBConnection(); 77 Statement st = con.createStatement(); 78 int recordsNo = st.executeUpdate(sql); 79 if(recordsNo == 0) { 80 throw new RuntimeException("执行失败: " + sql); 81 } else if(recordsNo == 1){ 82 logger.info("更新成功1条: " + sql); 83 } else { 84 logger.info("更新成功条数: " + recordsNo); 85 } 86 closeConnection(con); 87 } 88 89 //存在数据的时候更新,不存在的时候不需要更新,影响数据行数为0或者1 90 public static void updateDBIfExist(String sql) throws SQLException{//对增删改 91 //获得连接 92 Connection con = getDBConnection(); 93 Statement st = con.createStatement(); 94 int recordsNo = st.executeUpdate(sql); 95 logger.info("更新成功的record数量 " + recordsNo); 96 closeConnection(con); 97 } 98 99 public static void deleteVacationBalance(String code, String staffId) throws SQLException { 100 String sql = "DELETE lb FROM Leave_Balance lb LEFT JOIN Leave_Code lc ON lc.id = lb.LeaveCode_id " 101 + "WHERE lc.LeaveBenefitCode ='" + code + "' and taffno ='" + staffId + "'"; 102 updateDB(sql); 103 } 104 105 /** 106 * 删除历史组织架构 107 * @param code 108 * @param staffId 109 * @throws SQLException 110 */ 111 public static void deleteHistoryOrganzationalStructure(String hisname) throws SQLException { 112 String sql = "DELETE FROM Org_DataType WHERE NAME='" + hisname + "'"; 113 updateDB(sql); 114 } 115 116 /** 117 * 取得员工工号,该员工没有卡,用于case E-653 118 * @return 119 * @throws SQLException 120 */ 121 public static String getStaffNoWithoutCard() throws SQLException { 122 String sql = "SELECT ac.staffNo FROM At_Card ac INNER JOIN hr_Staff hs ON ac.StaffNo = hs.StaffNo " 123 + "WHERE ac.No = '' AND hs.StaffType = 'Active'"; 124 String id = query(sql).get(0); 125 String sqlDelete = String.format("DELETE ap FROM At_PunchClockInfo ap INNER JOIN At_Card ac ON ap.At_Card_id = ac.Id " 126 + "WHERE ac.StaffNo ='%s'", id); 127 updateDB(sqlDelete); 128 return id; 129 } 130 }
六: jenkins配置增加JDBC