Java操作数据库之类的封装!...

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

class DBManager{

//定义成员变量
Connection conn =null;
Statement  stmt =null;
ResultSet  rst  =null;

//创建数据库连接对象
public void getConnection(String dbIP,String dbPort,String dbName,String dbUser,String dbPassword){
//加载数据库驱动
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch(ClassNotFoundException e){

System.out.println("加载数据库驱动失败:\n"+e.toString());

return;

}

//开始连接数据库
try{
conn =DriverManager.getConnection("jdbc:sqlserver://"+dbIP+":"+dbPort+";databaseName="+dbName, dbUser, dbPassword);
}
catch (SQLException e) {
System.out.println("获取连接失败" + e.toString());
return;
}
}

//得到SQL执行对象
public Statement getStatement(){
try{
stmt =conn.createStatement();
}
catch(SQLException e){
System.out.println(e.toString());
return stmt =null;
}
return stmt;
}
  
  //创建记录,即向数据库中插入数据
  public int create(Statement stmt,String sqlCreate){
  int nRecord=0;
  try{
  nRecord =stmt.executeUpdate(sqlCreate);
  }
  catch(SQLException e){
  System.out.println(e.toString());
  }
  
  return nRecord;
}
  
  //查询记录
  public ResultSet read(Statement stmt,String sqlSelect){
  ResultSet rst =null;
  try{
  rst =stmt.executeQuery(sqlSelect);
  }
  catch(SQLException e){
  System.out.println(e.toString());
  }
  
  return rst;
}
  
  //更新记录
  public int update(Statement stmt,String sqlUpdate){
  int nRecord=0;
  try{
  nRecord =stmt.executeUpdate(sqlUpdate);
  }
  catch(SQLException e){
  System.out.println(e.toString());
  }
  return nRecord;
}
  
  //删除记录
  public int delete(Statement stmt,String sqlDelete){
  int nRecord=0;
  try{
  nRecord =stmt.executeUpdate(sqlDelete);
  }
  catch(SQLException e){
  System.out.println(e.toString());
  }
  return nRecord;
}
  
   //关闭结果集
  public void closeResultSet(ResultSet rs){
  try{
  rst.close();
  }
  catch(SQLException e){
  System.out.println(e.toString());
  return;
  }
  }
   //关闭SQL语句执行对象
  public void closeStatement(Statement stmt){
  try{
  stmt.close();
  }
  catch(SQLException e){
  System.out.println(e.toString());
  return;
  }

}

//断开与数据库的连接

  public void closeConnection(Connection conn){
  try{
  conn.close();
  }
  catch(SQLException e){
  System.out.println(e.toString());
  return;
  }
}
}