UC知道关于JAVA代码读取表里一组数据的问题（代码版的）
来源：百度知道 编辑：UC知道 时间：2024/06/04 17:45:25
package cn;
import java.sql.*;
public class Test {
public static void main(String[] args){
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
String dbURL = "jdbc:sqlserver://localhost:1433;Database=sample";
String userName = "sa";
String userPwd = "2219013";
try{
Class.forName(driverName);
Connection dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
//PreparedStatement ps = dbConn.prepareStatement("Select from USER where user_id='070502'");
Statement stmt = dbConn.createStatement();
ResultSet rs = stmt.executeQuery("Select * from [USER] where user_id='070502'");
while(rs.next()){
System.out.println(rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3)+" "+rs.getString(4));
}
}catch(Exception
import java.sql.*;
public class Test {
public static void main(String[] args){
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
String dbURL = "jdbc:sqlserver://localhost:1433;Database=sample";
String userName = "sa";
String userPwd = "2219013";
try{
Class.forName(driverName);
Connection dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
//PreparedStatement ps = dbConn.prepareStatement("Select from USER where user_id='070502'");
Statement stmt = dbConn.createStatement();
ResultSet rs = stmt.executeQuery("Select * from [USER] where user_id='070502'");
while(rs.next()){
System.out.println(rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3)+" "+rs.getString(4));
}
}catch(Exception
好像有个数据集，可以循环的。
Java连接数据库一般都是六步(具体的操作步骤会不同):
连接数据库之前要导入数据库相应的驱动包。
以MySQL数据库为例：
1.加载数据库驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (Exception e) {
e.printStackTrace();//打印异常
}
2.连接数据库
try{
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/db",
"root","root");//获得数据库连接，用户名，密码,db:数据库名称
}catch(Exception e){
e.printStackTrace();
}
3.创建执行语句
Statement stmt=conn.createStatement();
4.返回结果。
ResultSet rs=stmt.createStatement("select * from db.table");
5.处理结果
while(rs.next()) {
rs.getString("username");
rs.getString("password");
}
6.关闭所有连接(先打开的连接后关闭)]
rs.close();
stmt.close();
conn.close();