Eclipse+Java数据库实现“增删改查”代码 |
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Eclipse+Java数据库实现“增删改查”代码
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建立包： shixun 导入jar(这里我用的是D:\Java\jdk-15.0.2\lib\mssql-jdbc-9.2.1.jre11.jar) 想要下载的在这下载 链接：https://pan.baidu.com/s/1xp3VHBcFHqhqV2iRDxFUEg 提取码：zyg5 具体导入： 1.打开一个项目，右击 找到 Build Path->configure Build path 2.
3.
4.导入jar
5.应用
ok, 下面，我们上代码 插入代码 AddJdbc.java package shixun.day02; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Statement; import java.sql.*; import javax.swing.JOptionPane; public class AddJdbc { public static void main(String[] args) { //声明JDBC驱动程序对象 String JDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; //定义JDBC的URL对象,TestDB为数据源 String conURL="jdbc:sqlserver://localhost:1433;DatabaseName=student"; String userName="sa"; String userPwd="123"; try { Class.forName(JDriver); } catch(java.lang.ClassNotFoundException e) { System.out.println("ForName :" + e.getMessage( )); } try { Connection con=DriverManager.getConnection(conURL,userName,userPwd); Statement s=con.createStatement( ); String r1="insert into stu(name,id,age,sex) values ('张三',1,18,'男')"; String r2="insert into stu(name,id,age,sex) values ('李四',2,19,'男')"; String r3="insert into stu(name,id,age,sex) values ('赵五',3,18,'男')"; //使用SQL 命令insert插入三条学生记录到表中 s.executeUpdate(r1); s.executeUpdate(r2); s.executeUpdate(r3); s.close( ); con.close( ); } catch(SQLException e) { System.out.println("SQLException: " +e.getMessage( )); } } }更新代码 UpdateDate.java package shixun.day02; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Statement; import java.sql.*; import javax.swing.JOptionPane; public class UpdateDate { public static void main(String[] args) { //声明JDBC驱动程序对象 String JDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; //定义JDBC的URL对象,TestDB为数据源 String conURL="jdbc:sqlserver://localhost:1433;DatabaseName=student"; String userName="sa"; String userPwd="123"; try { Class.forName(JDriver); } catch(java.lang.ClassNotFoundException e) { System.out.println("ForName :" + e.getMessage( )); } try { Connection con=DriverManager.getConnection(conURL,userName,userPwd); Statement s=con.createStatement( ); String r1="UPDATE stu set name='lib' where id=1"; 更新数据 s.executeUpdate(r1); s.close( ); con.close( ); } catch(SQLException e) { System.out.println("SQLException: " +e.getMessage( )); } } }删除代码 Delete.java package shixun.day02; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Statement; import java.sql.*; import javax.swing.JOptionPane; public class Delete { public static void main(String[] args) { //声明JDBC驱动程序对象 String JDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; //定义JDBC的URL对象,TestDB为数据源 String conURL="jdbc:sqlserver://localhost:1433;DatabaseName=student"; String userName="sa"; String userPwd="123"; try { Class.forName(JDriver); } catch(java.lang.ClassNotFoundException e) { System.out.println("ForName :" + e.getMessage( )); } try { Connection con=DriverManager.getConnection(conURL,userName,userPwd); Statement s=con.createStatement( ); String r1="delete from stu where id = 2"; System.out.println("删除成功！ "); //删除 s.executeUpdate(r1); s.close( ); con.close( ); } catch(SQLException e) { System.out.println("SQLException:！ " +e.getMessage( )); } } }查找代码 Select.java package shixun.day02; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Statement; import java.sql.*; import javax.swing.JOptionPane; public class Select { public static void main(String[] args) { //声明JDBC驱动程序对象 String JDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; //定义JDBC的URL对象,TestDB为数据源 String conURL="jdbc:sqlserver://localhost:1433;DatabaseName=student"; String userName="sa"; String userPwd="123"; try { Class.forName(JDriver); } catch(java.lang.ClassNotFoundException e) { System.out.println("ForName :" + e.getMessage( )); } try { Connection con=DriverManager.getConnection(conURL,userName,userPwd); Statement s=con.createStatement( ); String r1="select * from stu where id = 2"; //查询代码 s.executeUpdate(r1); s.close( ); Statement m = con.createStatement(); ResultSet rs = m.executeQuery("select * from student"); while (rs.next()) { System.out.println(rs.getString("name") + "\t" + rs.getInt("id") + "\t" + rs.getInt("age")+ "\t" + rs.getString("sex")); } m.close(); con.close(); } catch (SQLException e) { System.out.println("SQLException: " + e.getMessage()); } } } |
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