JDBC里面关于元数据的有关问题

【求助】JDBC里面关于元数据的问题

Java code

import java.sql.Connection;import java.sql.ParameterMetaData;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;//参数的数据源信息public class PMMD {    public static void main(String[] args) throws SQLException {        read("select id,name,birthday,money from user1 where name=? and birthday<? and money>?",null);    }    static void read(String sql,Object[] params) throws SQLException{        Connection conn = null;        PreparedStatement ps = null;        ResultSet rs = null;        try {            conn = JdbcUtilsSing.getInstance().getConnection();            ps = conn.prepareStatement(sql);                ParameterMetaData pmd = ps.getParameterMetaData();            int count = pmd.getParameterCount();            for(int i =1;i<=count;i++){                System.out.print(pmd.getParameterClassName(i)+"\t");                System.out.print(pmd.getParameterType(i)+"\t");              System.out.println(pmd.getParameterTypeName(i));            }        } finally{            JdbcUtils.free(rs,ps,conn);        }    }}

Java code

Exception in thread "main" java.sql.SQLException: 不支持的特性    at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:119)    at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:115)    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:221)    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:293)    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:574)    at oracle.jdbc.driver.DatabaseError.throwUnsupportedFeatureSqlException(DatabaseError.java:1009)    at oracle.jdbc.driver.OracleParameterMetaData.getParameterClassName(OracleParameterMetaData.java:193)    at com.jdbc.PMMD.read(PMMD.java:27)    at com.jdbc.PMMD.main(PMMD.java:12)