1、java数据库连接、查询、更新

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 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

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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; } }

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原文链接：https://blog.csdn.net/lxl121181/article/details/79174842