您是否要基于关键字构建完整的数据库搜索?您可以通过以下代码获取表名，表列名和行数.但是您无法在同一代码中获取行数据，而是可以基于搜索结果获取行数据.

Are you trying to build a full database search based on a key word? You can get table names , table column names and row counts by following code. But you cannot get row data within same code, you can get row data based on search results.

   --Set output size
   SET serveroutput ON size 1000000

   DECLARE
      -- var table Name for cursor loop.
      t_c1_tname      user_tab_columns.table_name%TYPE;
      -- var column name for dynamic sql statement.
      t_c1_cname      user_tab_columns.column_name%TYPE;
      -- var string for dynamic sql statement.
      t_command       VARCHAR2(200);
      -- var for your search key word.
      l_str varchar2(20) := '%test%';
      -- var for dynamic cursor.
      t_cid           INTEGER;
      -- var for total row counts.
      t_total_records NUMBER(10);
      -- var for stat of executing dynamic sql statement.
      stat            INTEGER;
      --var for each loop row counts.
      row_count       INTEGER;
      -- var for minimum search result, here I set value = 0;
      t_limit         INTEGER := 0;    -- Only show tables with more rows

      -- cursor gets all table name, column name.
      CURSOR c1 IS select table_name, column_name
        from user_tab_columns
        where data_type in ( 'VARCHAR2' , 'VARCHAR', 'CHAR' );
    BEGIN
      t_limit := 0;
      OPEN c1;
      LOOP
      FETCH c1 INTO t_c1_tname,t_c1_cname;
      EXIT WHEN c1%NOTFOUND;
      -- Here create dynamic sql statement. 
      t_command := 'SELECT COUNT(0) FROM '||t_c1_tname || ' where ' || t_c1_cname ||' like '''|| l_str||'''';
      t_cid := DBMS_SQL.OPEN_CURSOR;
      DBMS_SQL.PARSE(t_cid,t_command,DBMS_SQL.native);
      DBMS_SQL.DEFINE_COLUMN(t_cid,1,t_total_records);
      -- Here execute dynamic sql statement. 
      stat := DBMS_SQL.EXECUTE(t_cid);
      row_count := DBMS_SQL.FETCH_ROWS(t_cid);
      -- Here get total row counts for each loop.
      DBMS_SQL.COLUMN_VALUE(t_cid,1,t_total_records);
      IF t_total_records > t_limit THEN
         --Here output results
         DBMS_OUTPUT.PUT_LINE(RPAD(t_c1_tname,55,' ')||RPAD(t_c1_cname,55,' ')||
                        TO_CHAR(t_total_records,'99999999')||' record(s)');
         -- here you can insert results into your table.
         --INSERT INTO search_db_results VALUES (t_c1_tname,t_c1_cname,t_total_records);
      END IF;
      DBMS_SQL.CLOSE_CURSOR(t_cid);
      END LOOP;
      CLOSE c1;

     -- COMMIT if you have any insert statement.
     -- COMMIT;
    END;
    /