最好用PreparedStatement
int inT=1;
String name="sky",sex="man";
PreparedStatement st = conn.prepareStatement("insert into stu (number,name,sex) values(?,?,?)");
st.setString(1,inT);
st.setString(2,name);
st.setString(3,sex);
st.executeQuery();
int inT=1;
String name="sky",sex="man";
String QueryStr="insert into stu (number,name,sex) values('"+inT+"','"+name+"','"+sex+"')";
rs=stt.executeQuery(QueryStr);