Question

我正在使用JDBC驱动程序连接到不同的数据库类型。我的数据库的用户仅对目录具有查看权限。它适用于hive / teradata，但不适用于Oracle。

使用Oracle，我能够检索模式，但不能检索表/列。

Oracle特权：

SELECT_CATALOG_ROLE，创建会话，连接

Java代码：

DatabaseMetaData databaseMetadata = con.getMetaData（）; resTables = databaseMetadata.getTables（“ Test_Schema”，null，null， null）;

但是一旦我对表授予选择权限，它就会起作用。

我想念什么吗？

Answer 1

使用DatabaseMetaData.getMetaData答复基础视图all_objects，all_tab_comments和all_synonyms。这些视图考虑了授予访问权限的条件。

SELECT_CATALOG_ROLE授予对目录的访问权限，该目录将允许查询dba_objects。

要执行要求的操作，可以轻松地编写到DatabaseMetaData.getMetaData（）。getTables（..）的镜像Java API以使用dba_xyz视图。与此类似。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

import oracle.jdbc.OracleConnection;
import oracle.jdbc.OracleDatabaseMetaData;

public class MyMetaData extends OracleDatabaseMetaData {



    public MyMetaData(Connection conn) {
        super((OracleConnection) conn);
    }

    public synchronized ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) throws SQLException {
        // catalog isn't used
        // dba view based sql  

        String sql = "SELECT NULL AS table_cat,"+
        "       o.owner AS table_schem,\n       "+
        "       o.object_name AS table_name,\n  "+
        "       o.object_type AS table_type,\n"+
        "       c.comments AS remarks\n" +
        "  FROM dba_objects o, dba_tab_comments c\n"+
        "  WHERE o.owner LIKE :1 ESCAPE '/'\n    "+
        "  AND o.object_name LIKE :2 ESCAPE '/'\n"+
        "  AND o.owner = c.owner (+)\n    "+
        "  AND o.object_name = c.table_name (+)\n";

        // bind params

         PreparedStatement stmt = connection.prepareStatement(sql);
         stmt.setString(1, schemaPattern == null ? "%" : schemaPattern);
         stmt.setString(2, tableNamePattern == null ? "%" : tableNamePattern);

        return stmt.executeQuery();
    }

    public static void main(String[] args) throws SQLException {

        String conString = "jdbc:oracle:thin:@//localhost:1521/xe";
        Properties props = new Properties();
        props.setProperty("user", "klrice");
        props.setProperty("password", "klrice");
        Connection conn = DriverManager.getConnection(conString, props);
        // use this class
        MyMetaData md = new MyMetaData(conn);

        // test it out
        ResultSet rset = md.getTables(null, "ORDS_METADATA", null, null);
            while (rset.next()) {
                System.out.println(rset.getString(2));
            }    

    }

}

Answer 2

SELECT_CATALOG_ROLE允许对数据字典视图进行SELECT特权（例如select * from dba_users），但不适用于用户表。您必须明确指定所需表的权限，例如 grant select,update,delete on need_table for user_name; grant select,update,delete on DEPARTMENTS to test;

或赋予所有表选择权限（不切实际）。

[oracle10@aktp ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Wed Nov 21 14:39:55 2018

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> grant select any table to test;

Grant succeeded.

。

Answer 3

我在 jdbc 上遇到了同样的问题。我的解决方案就是这么简单。

create or replace synonym youruser.all_objects for dba_objects;
create or replace synonym youruser.all_tables for dba_tables;
create or replace synonym youruser.all_tab_columns for dba_tab_columns;
create or replace synonym youruser.all_users for dba_users;
create or replace synonym youruser.all_constraints for dba_constraints;
create or replace synonym youruser.all_cons_columns for dba_cons_columns;

这对我来说效果很好。

特权oracle jdbc getMetaData

3 个答案: