日期:2014-05-20  浏览次数:20828 次

【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);
        }
    }
}

报错如下:
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)



这真神奇了,实在不知道什么原因,求高人们解答~~

------解决方案--------------------
探讨
不过我就想知道oracle真的不能使用ParameterMetaData这个类么