java - 权限 oracle jdbc getMetaData

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具有目录的查看权限。它适用于 hive/teradata，但不适用于 Oracle。

使用 Oracle，我可以检索架构，但不能检索表/列。

Oracle 权限:

SELECT_CATALOG_ROLE, CREATE SESSION, CONNECT

Java 代码:

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

但是一旦我授予表的选择权限，它就可以工作。

我错过了什么吗？

Answer 1

使用 DatabaseMetaData.getMetaData 会回复基础 View all_objects 、 all_tab_comments 和 all_synonyms 。这些 View 考虑了授予访问权限的内容。

SELECT_CATALOG_ROLE 授予对允许查询 dba_objects 的目录的访问权限。

为了执行所要求的操作，可以轻松编写 DatabaseMetaData.getMetaData().getTables(..) 的镜像 Java API 以使用 dba_xyz View 。与此类似的事情。

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));
            }    

    }

}