java与数据库的连接实例

/*在进行下面的操作时，先配置好数据库连接驱动*/

 

//将数据插入oracle

import java.sql.*;

public class JDBCExample {
 public static void main(String[] args) {
  String driver = "oracle.jdbc.driver.OracleDriver";
  String url = "jdbc:oracle:thin:@192.168.1.224:1521:ora9";
  String username = "scott";
  String password = "root";
  String sql = "insert into users(username,password) values(?,?)";
  try {
   Class.forName(driver);
   // new oracle.jdbc.driver.OracleDriver();
   Connection conn = DriverManager.getConnection(url, username,
     password);
   // Statement stat = conn.createStatement();
   PreparedStatement pstmt = conn.prepareStatement(sql);
   pstmt.setString(1, "samka");
   pstmt.setString(2, "123");
   pstmt.executeUpdate();

   pstmt.close();
   conn.close();
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {

   e.printStackTrace();
  }
 }

}

 

//查询oracle中的数据

import java.sql.*;

public class JDBCExample {
 public static void main(String[] args) {
  String driver = "oracle.jdbc.driver.OracleDriver";
  String url = "jdbc:oracle:thin:@192.168.1.224:1521:ora9";
  String username = "scott";
  String password = "root";
  String sql = "select * from users";
  try {
   Class.forName(driver);
   // new oracle.jdbc.driver.OracleDriver();
   Connection conn = DriverManager.getConnection(url, username,
     password);
   // Statement stat = conn.createStatement();
   PreparedStatement pstmt = conn.prepareStatement(sql);

   ResultSet rs = pstmt.executeQuery();
   while (rs.next()) {
    System.out.println("name:" + rs.getString("username")
      + "/tpassword:" + rs.getString("password"));
   }
   rs.close();
   pstmt.close();
   conn.close();
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {

   e.printStackTrace();
  }
 }

}

 

//对MySql进行插入操作

import java.sql.*;
public class register
{ 
 /**
  * @param args
  */
 String name="samka";
 String gender="male";
 String phone="8873293";
 String introduction="I am a student!";
 
 public void setsName(String name)
 {
  this.name = name;
 }
 public String getsName()
 {
  return name;
 }
 
 public void setsGender(String gender)
 {
  this.gender = gender;
 }
 public String getsGender()
 {
  return gender;
 }
 
 public void setsPhone(String phone)
 {
  this.phone = phone;
 }
 public String getsPhone()
 {
  return phone;
 }
 
 public void setsIntroduction(String introduction)
 {
  this.introduction = introduction;
 }
 public String getsIntroduction()
 {
  return introduction;
 }

 public void insert()
 {
  try
  {
   Class.forName("com.mysql.jdbc.Driver");
   Connection con = DriverManager.getConnection("jdbc:mysql://localhost/service","root","root");
   //不明白下面两个参数?
   Statement stat = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
   //插入语句:executeUpdate
   stat.executeUpdate("insert into register(name,gender,phone,introduction)values('"+this.getsName()+"','"+this.getsGender()+"','"+this.getsPhone()+"','"+this.getsIntroduction()+"')");
   
  }
  catch(SQLException e)
  {
   System.out.print("插入失败"+e);
  }
  catch(Exception e)
  {
   System.out.print("有异常"+e);
  }
 }
 public static void main(String[] args)
 {
  register reg = new register();
  reg.insert();
 }
}

 

//对MySql的查询操作

import java.sql.*;
public class select
{
  public static void main(String[] args)
  {
   String rowdata="rfghtryhthy";
   ResultSet result;
   try{
    Connection con;
    Class.forName("com.mysql.jdbc.Driver");
    con = DriverManager.getConnection("jdbc:mysql://localhost/service","root","root");
    Statement stat = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
    result = stat.executeQuery("select * from register");
    //获得结果集元数据
    ResultSetMetaData rsmd = result.getMetaData();
    //得到结果集中的列数
    int colCount = rsmd.getColumnCount();
    //得到结果集中第一列的列名
    rowdata = rsmd.getColumnName(1).trim();
    //依次得到其余列的列名
    for(int i=2; i<=colCount; i++)
    {
     rowdata = rowdata+" : "+rsmd.getColumnName(i).trim();
    }
    System.out.println(rowdata);
    System.out.println("----------------------------------------------------");
    while(result.next())
    {
     rowdata = result.getString(1).trim();
     for(int i=2; i<=colCount; i++)
     {
      rowdata = rowdata+" : "+result.getString(i);
     }
     
     System.out.println(rowdata);
     System.out.println("/n");
    }
    
   }
   catch(Exception e)
   {
    System.out.print("有异常"+e);
   }
  }
}