首页技术文章正文

天富娱乐注册注册开户亚星ybl6148【实战教程】

更新时间:2021年08月06日18时44分来源:传智教育浏览次数:

好口碑IT培训

(一)创建工程，引入驱动包

在下图目录中可以找到驱动包ORACLE的JDBC驱动包，拷贝到工程即可使用

jdbc链接oracel数据库01

创建java工程waterboss，建立lib文件夹，将ojdbc.jar拷贝到此文件夹，然后add build path

(二)BaseDao

我们通常编写BaseDao负责加载驱动，获取数据库连接，关闭资源，代码如下：

 package cn.itcast.waterboss.dao; import java.sql.SQLException; /** * 基本数据访问类 * @author Administrator * */ public class BaseDao { static { try { Class.forName("oracle.jdbc.driver.OracleDriver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } } /** * 获取数据库连接 * @return * @throws SQLException */ public static java.sql.Connection getConnection() throws SQLException { return java.sql.DriverManager.getConnection( "jdbc:oracle:thin:@192.168.80.10:1521:orcl", "wateruser", "itcast" ); } /** * 关闭资源 * @param rs * @param stmt * @param conn */ public static void closeAll( java.sql.ResultSet rs, java.sql.Statement stmt, java.sql.Connection conn ) { if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (stmt != null) { try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }

JDBC驱动为：

oracle.jdbc.OracleDriver

连接字符串( 瘦连接 )：

jdbc:oracle:thin:@虚拟机的 IP:1521:orcl

(三)业主增删改代码编写

1.创建实体类

 package cn.itcast.waterboss.entity; import java.util.Date; /** * 业主实体类 * @author Administrator * */ public class Owners { private Long id; private String name; private Long addressid; private String housenumber; private String watermeter; private Date adddate; private Long ownertypeid; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Long getAddressid() { return addressid; } public void setAddressid(Long addressid) { this.addressid = addressid; } public String getHousenumber() { return housenumber; } public void setHousenumber(String housenumber) { this.housenumber = housenumber; } public String getWatermeter() { return watermeter; } public void setWatermeter(String watermeter) { this.watermeter = watermeter; } public Date getAdddate() { return adddate; } public void setAdddate(Date adddate) { this.adddate = adddate; } public Long getOwnertypeid() { return ownertypeid; } public void setOwnertypeid(Long ownertypeid) { this.ownertypeid = ownertypeid; } }

2.创建Dao类实现增删改

 package cn.itcast.waterboss.dao; import cn.itcast.waterboss.entity.Owners; import java.sql.SQLException; /** * 业主数据访问类 * @author Administrator * */ public class OwnersDao { /** * 新增业主 * @param owners */ public static void add(Owners owners) { java.sql.Connection conn = null; java.sql.PreparedStatement stmt = null; try { conn = BaseDao.getConnection(); stmt = conn.prepareStatement("insert into T_OWNERS values(?,?,?,?,?,?,?)"); stmt.setLong(1, owners.getId()); stmt.setString(2, owners.getName()); stmt.setLong(3, owners.getAddressid()); stmt.setString(4, owners.getHousenumber()); stmt.setString(5, owners.getWatermeter()); stmt.setDate(6, new java.sql.Date(owners.getAdddate().getTime())); stmt.setLong(7, owners.getOwnertypeid()); stmt.execute(); } catch (SQLException e) { e.printStackTrace(); } finally { BaseDao.closeAll(null, stmt, conn); } } /** * 修改业主 * @param owners */ public static void update(Owners owners) { java.sql.Connection conn = null; java.sql.PreparedStatement stmt = null; try { conn = BaseDao.getConnection(); stmt = conn.prepareStatement( "update T_OWNERS set name=?,addressid=?,housenumber=?," + "watermeter=?,adddate=?, ownertypeid=? where id=?" ); stmt.setString(1, owners.getName()); stmt.setLong(2, owners.getAddressid()); stmt.setString(3, owners.getHousenumber()); stmt.setString(4, owners.getWatermeter()); stmt.setDate(5, new java.sql.Date(owners.getAdddate().getTime())); stmt.setLong(6, owners.getOwnertypeid()); stmt.setLong(7, owners.getId()); stmt.execute(); } catch (SQLException e) { e.printStackTrace(); } finally { BaseDao.closeAll(null, stmt, conn); } } /** * 删除业主 * @param owners */ public static void delete(Long id) { java.sql.Connection conn = null; java.sql.PreparedStatement stmt = null; try { conn = BaseDao.getConnection(); stmt = conn.prepareStatement("delete from T_OWNERS where id=?"); stmt.setLong(1, id); stmt.execute(); } catch (SQLException e) { e.printStackTrace(); } finally { BaseDao.closeAll(null, stmt, conn); } } }