sql="select email form user where name='"+sname+"'"; sname是变量!需要加单引号的!
sql="select email form user where name='"+sname+"'"; sname是个变量,要加单引号!
sql="select email form user where name='"+sname+"'";
调试的时候把需执行的sql语句输出来看看是不是你需要的。
sql="select email form user where name='"+sname+"'";
int --> Integer Integer it = new Integer(6); int --> String String s = String.valueOf(6);String --> int int i = Integer.parseInt(str); String --> Integer Integer it = Integer.valueOf(str);Integer --> int int i = it.intValue(); Intgeger --> String String s = it.toString();
char型的要用单引号括起来,数字就不用了
sql="select email form user where name='"+sname+"'";
sname是变量!需要加单引号的!
sname是个变量,要加单引号!
int --> String String s = String.valueOf(6);String --> int int i = Integer.parseInt(str);
String --> Integer Integer it = Integer.valueOf(str);Integer --> int int i = it.intValue();
Intgeger --> String String s = it.toString();