复用Oracle数据字典解析出SQL语句中用到的所有表

每个sql语句都它的执行计划，并且执行计划会放在plan_table中，plan_table中有object_name一列，该列表示sql语句中的对象名字，执

原理：

每个sql语句都它的执行计划，并且执行计划会放在plan_table中，plan_table中有object_name一列，该列表示sql语句中的对象名字，执行计划对表很感兴趣，所以如果object_type=’TABLE’,那么object_name就是我们要截取的table_name

执行步骤：

1、创建tmp_table 表，存放job名job_id,sql语句select_sql,和表名object_name

create table tmp_table(job_idvarchar2(50),select_sql clob,object_name varchar2(50));

模拟数据：

A job中是一条比较短的sql语句

B job中是一条比较长的sql语句

INSERTINTO TMP_TABLE VLAUES(‘A’,q’[A中的内容]’);

INSERTINTO TMP_TABLE VLAUES(‘B’,q’[B中的内容]’);

Commit;

2、创建p存储过程,根据执行计划

--以下是用4000以下的A job和4000 以上的B一起运行

create or replace procedure sqljiexiqi as

v_str varchar2(4000);

v_sql varchar2(4000);

v_sql1 varchar2(4000);

v_sql2 varchar2(4000);

v_sql3 varchar2(4000);

v_sql4 varchar2(4000);

v_sql5 varchar2(4000);

v_sql6 varchar2(4000);

v_sql7 varchar2(4000);

v_sql8 varchar2(4000);

v_sql9 varchar2(4000);

begin

dbms_output.enable(8000);

execute immediate 'truncate table tmp_table';

forc in (select job_id, select_sql

from bds.etl_job_info

where length(trim(select_sql)) < 4000

and job_id = 'A') loop

v_sql := 'explain plan SET STATEMENT_ID=''' || c.job_id || ''' for ' ||

c.select_sql;

execute immediate v_sql;

for re in (select distinct object_name

from plan_table

where statement_id = c.job_id

and object_type = 'TABLE') loop

insert into tmp_table

(job_id, select_sql, object_name)

values

(c.job_id, c.select_sql, re.object_name);

end loop;

commit;

endloop;

forc in (select job_id, select_sql

from bds.etl_job_info

where length(trim(select_sql)) > =4000

and job_id ='SJ_AS_CM_MORT_DTL_D') loop

v_str := 'explain plan SETSTATEMENT_ID=''' || c.job_id || ''' for ';

v_sql := substr(c.select_sql, 1,4000);

v_sql1 := substr(c.select_sql, 1 * 4000 + 1, 4000);

v_sql2 := substr(c.select_sql, 2 * 4000 + 1, 4000);

v_sql3 := substr(c.select_sql, 3 * 4000 + 1, 4000);

v_sql4 := substr(c.select_sql, 4 * 4000 + 1, 4000);

v_sql5 := substr(c.select_sql, 5 * 4000 + 1, 4000);

v_sql6:= substr(c.select_sql, 6 * 4000 + 1, 4000);

v_sql7 := substr(c.select_sql, 7 * 4000 + 1, 4000);

v_sql8 := substr(c.select_sql, 8 * 4000 + 1, 4000);

v_sql9 := substr(c.select_sql, 9 * 4000 + 1, 4000);

execute immediate v_str || v_sql || v_sql1 || v_sql2 || v_sql3 ||

v_sql4 || v_sql5 ||v_sql6 || v_sql7 || v_sql8 ||

v_sql9;

for re in (select distinct object_name

from plan_table

where statement_id = c.job_id

and object_type = 'TABLE')loop

insert into tmp_table

(job_id, select_sql, object_name)

values

(c.job_id, c.select_sql, re.object_name);

end loop;

commit;

endloop;

end;

3、执行存储过程

exec sqljiexiqi;

4、查询tmp_table表，得到sql中有哪些表

select * from tmp_table;