通过ResultSetMetaData 对象获取 数据库表结构(字段名称,类型,长度等)

• package java.sql;
• /**
• * An object that can be used to get information about the types
• * and properties of the columns in a <code>ResultSet</code> object.
• * The following code fragment creates the <code>ResultSet</code> object rs,
• * creates the <code>ResultSetMetaData</code> object rsmd, and uses rsmd
• * to find out how many columns rs has and whether the first column in rs
• * can be used in a <code>WHERE</code> clause.
• * <PRE>
• *
• * ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
• * ResultSetMetaData rsmd = rs.getMetaData();
• * int numberOfColumns = rsmd.getColumnCount();
• * boolean b = rsmd.isSearchable(1);
• *
• * </PRE>
• */
• publicinterface ResultSetMetaData extends Wrapper