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String sq="UPDATE user SET postnum=postnum+1 WHERE id="+uid;
PreparedStatement pstmt=conn.getPstmt(sq);
int flag=pstmt.executeUpdate(sq);
String sq="UPDATE user SET postnum=?+1 WHERE id="+uid;
PreparedStatement pstmt=conn.getPstmt(sq);
pstmt.setString(1,postnum);
int flag=pstmt.executeUpdate(sq);