大家帮我看看这段代码那里错误啊??关于PreparedStatement的!!
如题,谢谢!
public int execSELECT(String sql) throws SQLException
{
if (conn == null)
throw new SQLException ("连接还没有被建立!");
if (sql == null)
throw new SQLException ("SQL-statement是null!");
clearResult ();
/////创建可滚动的只读的数据集
pstmt = conn.createPreparedStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs = pstmt.executeQuery (sql);
rsmd = rs.getMetaData();
numCols = rsmd.getColumnCount();
return numCols;
}