从 from 子句的列中获取 table 名称

Question

我有一个视图 t，其中有一列用于 table 名称，另一列具有 where 子句条件。

    id| name|table_in| where_clause

    1 | Sam | t1 | age = 22

    2 | John| t2 | age = 23 and sex = 'male'

等等...

现在，我已将记录放入游标中，我想运行每个查询。

    create or replace procedure create_cursor 
    is

    CURSOR v_records is
    select * from t ;

    begin

    FOR temp IN v_records LOOP
        INSERT INTO myTable (id, name)
        select temp.id, temp.name 
        from temp.table where temp.where_clause;

        END LOOP;


    end;
    /

myTable 是另一个 table，我想在其中放置记录以供下一个用途。

Answer 1

您需要动态 sql 才能执行此操作：

CREATE OR REPLACE PROCEDURE create_cursor
IS
  l_statement VARCHAR2(32767);
  CURSOR v_records
  IS
    SELECT * FROM t;
BEGIN
  FOR temp IN v_records
  LOOP
    l_statement := 'INSERT INTO myTable (id, name)
          select id, name from ' || temp.table || 
          ' where ' || temp.where_clause;
    EXECUTE immediate l_statement;
  END LOOP;
END;
/

Answer 2

@Akshay,

请找到下面的代码供您参考。

Create or replace procedure create_cursor is
l_statement varchar2(32767);
cursor v_records is
  select * from t;
begin
for temp in v_records
loop
  l_statement := 'INSERT INTO myTable (id, name) select '||temp.id||','
   ||temp.name|| ' from ' || temp.table1 
   || ' where ' || temp.where_clause;

  execute immediate l_statement;
  end loop;
end;
/

从 from 子句的列中获取 table 名称

fetch table name from a column for from clause

sql

database

oracle

plsql

procedure