java数据库连接、查询、更新等

1、java数据库连接、查询、更新

nameget='%'+nameget+'%'; 
string sqlgname = "select * from goods where gname like ?"; 
try 
{ 
  pstmt = conn.preparestatement(sqlgname); 
  pstmt.setstring(1, nameget); 
  rs = pstmt.executequery(); 
  while (rs.next()) 
  { 
    int gid = rs.getint("gid"); 
    string gname = rs.getstring(2); 
    double gprice = rs.getdouble(3); 
    int gnum = rs.getint(4); 
    goods goods = new goods(gid,gname,gprice,gnum); 
    goodslist.add(goods); 
    } 
  } catch (sqlexception e) 
  { 
    e.printstacktrace(); 
  }finally 
  { 
    dbclose.queryclose(pstmt, rs, conn); 
  } 

2、连接数据库

public final class dbconn 
{ 
  public static connection getconn() 
  { 
    connection conn = null; 
     
    string user  = "root"; 
    string passwd = "root"; 
    string url = "jdbc:mysql://localhost:3306/shop"; 
     
    //已加载完驱动 
    try 
    { 
      class.forname("com.mysql.jdbc.driver");  
      conn = drivermanager.getconnection(url,user,passwd); 
    }catch (sqlexception e) 
    { 
      e.printstacktrace(); 
    } 
    catch (classnotfoundexception e) 
    { 
      e.printstacktrace(); 
    } 
    return conn; 
  } 
 
} 

这篇文章就介绍到这，下一篇将为大家更好的更相关的文章。