前提：
1.建立了与sqlserver数据库的连接
(JTDS连接sqlserver数据库的包jtds-1.2.7.jar)
2. 了解JDBC执行SQL的语法
一.实现效果
二.实现代码
1.DBUtil.java
说明：直接复制必然出错。
因为要连接自己的数据库，其中部分数据说明：
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
//本机V8 ip 192.168.223.1
//在数据库中建立的一个登录名 admin
//登录名admin 的密码 123123
//要连接的数据库 物流寄存 （因为是临时作业就先随便找个数据库放了）
DBUtil.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DBUtil
{
//连接数据库
private static Connection getSQLConnection(String ip, String user, String pwd, String db)
{
Connection con = null;
try
{
Class.forName("net.sourceforge.jtds.jdbc.Driver");
//con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/" + db + ";charset=utf8", user, pwd);
//jdbc:jtds:sqlserver://localhost:1433/dbname
//解决输出中文乱码
con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/" + db , user, pwd);
} catch (ClassNotFoundException e)
{
e.printStackTrace();
} catch (SQLException e)
{
e.printStackTrace();
}
return con;
}
//查询
public static String QuerySQL()
{
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "select * from 学生信息表";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
//System.out.println(rs);
while (rs.next())
{//学号、姓名、班级、性别、专业、学院
String s1 = rs.getString("学号").trim();
String s2 = rs.getString("姓名").trim();
String s3 = rs.getString("班级").trim();
String s4 = rs.getString("性别").trim();
String s5 = rs.getString("专业").trim();
String s6 = rs.getString("学院").trim();
result += s1 + " " + s2 + " " + s3 + " " + s4+ " " + s5+" "+s6+"\n";
// System.out.println(s1 + " - " + s2);
}
rs.close();
stmt.close();
conn.close();
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
//插入学生信息
public static String insert_student(String sno,String name,String banji,String sex,String shuanye,String xueyuan)
{//学号、姓名、班级、性别、专业、学院
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "insert into 学生信息表 values ('"+sno+"','"+name+"','"+banji+"','"+sex+"','"+shuanye+"','"+xueyuan+"');";
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);
stmt.close();
conn.close();
result+="插入成功";
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
//删除学生信息
public static String delete_student(String sno)
{//学号、姓名、班级、性别、专业、学院
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "delete 学生信息表 where 学号 = " + sno;
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);
stmt.close();
conn.close();
result+="删除成功";
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
//按学号查询
public static String QuerySQL_sno(String sno)
{
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1 171.120.157.130
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "select * from 学生信息表 where 学号 = '"+ sno+"';";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while (rs.next())
{//学号、姓名、班级、性别、专业、学院
String s1 = rs.getString("学号").trim();
String s2 = rs.getString("姓名").trim();
String s3 = rs.getString("班级").trim();
String s4 = rs.getString("性别").trim();
String s5 = rs.getString("专业").trim();
String s6 = rs.getString("学院").trim();
result += s1 + " " + s2 + " " + s3 + " " + s4+ " " + s5+" "+s6+"\n";
// System.out.println(s1 + " - " + s2);
}
rs.close();
stmt.close();
conn.close();
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
//按性别查询
public static String QuerySQL_sex(String sex)
{
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1 171.120.157.130
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "select * from 学生信息表 where 性别 = '"+sex+"';";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while (rs.next())
{//学号、姓名、班级、性别、专业、学院
String s1 = rs.getString("学号").trim();
String s2 = rs.getString("姓名").trim();
String s3 = rs.getString("班级").trim();
String s4 = rs.getString("性别").trim();
String s5 = rs.getString("专业").trim();
String s6 = rs.getString("学院").trim();
result += s1 + " " + s2 + " " + s3 + " " + s4+ " " + s5+" "+s6+"\n";
// System.out.println(s1 + " - " + s2);
}
rs.close();
stmt.close();
conn.close();
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
//按学院查询
public static String QuerySQL_xueyuan(String xueyuan)
{
String result = "";
try
{ //10.0.2.2 android ip
//本机V8 ip 192.168.223.1 171.120.157.130
Connection conn = getSQLConnection("192.168.223.1", "admin", "123123", "物流寄存");
String sql = "select * from 学生信息表 where 学院 = '"+ xueyuan +"';";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
//System.out.println(rs);
while (rs.next())
{//学号、姓名、班级、性别、专业、学院
String s1 = rs.getString("学号").trim();
String s2 = rs.getString("姓名").trim();
String s3 = rs.getString("班级").trim();
String s4 = rs.getString("性别").trim();
String s5 = rs.getString("专业").trim();
String s6 = rs.getString("学院").trim();
result += s1 + " " + s2 + " " + s3 + " " + s4+ " " + s5+" "+s6+"\n";
// System.out.println(s1 + " - " + s2);
}
rs.close();
stmt.close();
conn.close();
} catch (SQLException e)
{
e.printStackTrace();
result += "查询数据异常!" + e.getMessage();
}
return result;
}
public static void main(String[] args)
{
QuerySQL();
}
}
2.操作程序test.java
说明：只要DBUtil.java无错误，并且可以利用DBUtil.java操作数据库，则这个test.java可以直接复制
import java.util.*;
public class test {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int flag = 0;
String sno = "", name = " ", banji = " ", sex = " ", shuanye = " ", xueyuan = " ";
System.out.println(" 学生信息管理程序 ");
System.out.println(" 0.查看控制面板 ");
System.out.println(" 1.查询全体学生信息 ");
System.out.println(" 2.插入学生信息 ");
System.out.println(" 3.删除学生 ");
System.out.println(" 4.修改学生信息 ");
System.out.println(" 5.查询相关信息 ");
System.out.println(" 6.退出 ");
while(true) {
System.out.println(" 输入要继续执行的操作:");
flag = in.nextInt();
in.nextLine();
if(flag == 6) break;
else {
switch (flag) {
case 0:
System.out.println(" 0.查看控制面板 ");
System.out.println(" 1.查询全体学生信息 ");
System.out.println(" 2.插入学生信息 ");
System.out.println(" 3.删除学生 ");
System.out.println(" 4.修改学生信息 ");
System.out.println(" 5.查询相关信息 ");
System.out.println(" 6.退出 ");
break;
case 1://查询全部
System.out.println("查询全体学生信息：");
System.out.print(DBUtil.QuerySQL());
break;
case 2://插入信息
System.out.println("请输入要插入的学生的信息（以空格隔开）：");
String str = in.nextLine();
String[] S = str.split(" ");
sno = S[0];
name = S[1];
banji = S[2];
sex = S[3];
shuanye = S[4];
xueyuan = S[5];
System.out.print(DBUtil.insert_student(sno, name, banji, sex, shuanye, xueyuan));
break;
case 3://删除学生信息
System.out.println("请输入要删除的学生的学号：");
sno = in.nextLine();
System.out.print(DBUtil.delete_student(sno));
break;
case 4://修改学生信息
System.out.println("请输入要修改的学生的学号：");
sno = in.nextLine();
DBUtil.delete_student(sno);
System.out.println("请输入要修改的学生的信息以空格隔开(学号不可修改)：");
String str2 = in.nextLine();
String[] S2 = str2.split(" ");
name = S2[0];
banji = S2[1];
sex = S2[2];
shuanye = S2[3];
xueyuan = S2[4];
DBUtil.insert_student(sno, name, banji, sex, shuanye, xueyuan);
System.out.println("修改之后的数据：");
break;
case 5://查询相关信息
System.out.println(" 1.按学院查询 ");
System.out.println(" 2.按学号查询 ");
System.out.println(" 3.按性别查询 ");
int FLG = Integer.parseInt(in.nextLine());
//in.nextInt();
switch(FLG){
case 1 ://按学院查询
System.out.println("要查询的学院：");
String temp_xueyuan = in.nextLine();
System.out.print(DBUtil.QuerySQL_xueyuan(temp_xueyuan));
break;
case 2 ://按学号查询
System.out.println("要查询学生的学号：");
String temp_sno = in.nextLine();
System.out.print(DBUtil.QuerySQL_sno(temp_sno));
break;
case 3://按性别查询
System.out.println("要查询的性别：");
String temp_sex = in.nextLine();
System.out.print(DBUtil.QuerySQL_sex(temp_sex));
break;
}
break;
}//switch
}//else
}
}
}