package ;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 工具类
 * 
 */

public class Connectiontools {

  public static Connection getConn() {
    Connection conn = null;
    try {
      Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
      String url = "jdbc:sqlserver://localhost:1433;databaseName=test";
      String username = "zheng";
      String pwd = "123";
      conn = DriverManager.getConnection(url, username, pwd);
    } catch (SQLException e) {
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }
    return conn;
  }

  // 关闭修改操作
  public static void close(Statement stmt, Connection conn) {
    try {
      if (stmt != null) {
        stmt.close();
      }
      if (conn != null) {
        conn.close();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  // 关闭插入、插入等操作
  public static void close(Statement stmt, ResultSet rs, Connection conn) {
    try {
      if (stmt != null) {
        stmt.close();
      }
      if (rs != null) {
        rs.close();
      }
      if (conn != null) {
        conn.close();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }

  }

}

package ;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class StatementDemo1 {

  private Connection conn = null;
  private Statement stmt = null;
  private ResultSet result = null;

  // 查询员工信息
  public void query() {
    // 1、加载驱动
    try {
      conn = Connectiontools.getConn();
      stmt = conn.createStatement();
      // 查询信息
      String selectstr = "select *from info";
      result = stmt.executeQuery(selectstr);
      // 4、处理结果集
      System.out.println("员工编号：\t员工姓名：\t工作：");
      while (result.next()) {
        System.out.println(result.getString("id") + "\t" + result.getString("name") + "\t" + "\t"
            + result.getString("job"));
      }

    } catch (SQLException e) {
      e.printStackTrace();
    } finally {
      // 释放资源
      Connectiontools.close(stmt, result, conn);
    }

  }

  // 修改信息
  public void update() {
    try {
      // 1、加载驱动
      conn = Connectiontools.getConn();
      // 2、创建statement
      stmt = conn.createStatement();
      // 3、创建sql语句
      String updatestr = "update info set job='教授 ' where id='001'";
      int result = stmt.executeUpdate(updatestr);
      // 4、处理结果集
      if (result > 0) {
        System.out.println("更新成功！！！");
      } else {
        System.out.println("更新失败！！！");
      }
    } catch (SQLException e) {
      e.printStackTrace();
    } finally {
      Connectiontools.close(stmt, conn);
    }

  }

  public static void main(String[] args) {
    StatementDemo1 c = new StatementDemo1();
    c.query();
  }

}