利用ORACLE存储过程与JOB结合实现对数据表自动备份

1、创建存储过程
create or replace procedure data_auto_backup as
       v_tablename varchar2(200);
       v_year varchar2(10);
       v_month varchar2(10);
       v_bakdate varchar2(50);
       v_maxdate date;
       v_tablecount integer;
       v_recordcount integer;
begin
     select max(t.field1) - 30 into v_maxdate from table1 t;
     v_year := to_char(v_maxdate,'yyyy');
     v_month := to_char(v_maxdate,'MM');
     v_bakdate := to_char(v_maxdate,'yyyy-MM-dd');
    
     -- 检查将要使用的年月表是否存在
     v_tablename := 'table1' || v_year || v_month;
    
     SELECT COUNT(TABLE_NAME) INTO v_tablecount FROM USER_TABLES ut WHERE ut.table_name = v_tablename;
    
     if v_tablecount>0 then
         dbms_output.put_line('该表存在！');
     else begin
         dbms_output.put_line('该表不存在或当前用户无权访问！');
         execute immediate 'CREATE TABLE ' || v_tablename || '  AS SELECT * FROM table1 sr WHERE sr.field2=''''';
         end;
     end If;

     -- table1表备份
     execute immediate 'DELETE FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
     execute immediate 'INSERT INTO ' || v_tablename || ' SELECT * FROM table1 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
    
     --dbms_output.put_line('DELETE FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
     --dbms_output.put_line('INSERT INTO ' || v_tablename || ' SELECT * FROM table1 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
     --dbms_output.put_line('SELECT COUNT(sr.field2) FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
    
     execute immediate 'SELECT COUNT(sr.field2) FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''' into v_recordcount;
     if v_recordcount>0 then begin
         execute immediate 'DELETE FROM table1 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
         --dbms_output.put_line('DELETE FROM table1 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
         end;
     end If;
         
     commit;
    
     
     -- 检查将要使用的年月表是否存在
     v_tablename := 'table2' || v_year || v_month;
    
     SELECT COUNT(TABLE_NAME) INTO v_tablecount FROM USER_TABLES ut WHERE ut.table_name = v_tablename;
    
     if v_tablecount>0 then
         dbms_output.put_line('该表存在！');
     else begin
         dbms_output.put_line('该表不存在或当前用户无权访问！');
         execute immediate 'CREATE TABLE ' || v_tablename || '  AS SELECT * FROM table2 cpi WHERE cpi.field3=''''';
         end;
     end If;

     -- table2表备份
     execute immediate 'DELETE FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
     execute immediate 'INSERT INTO ' || v_tablename || ' SELECT * FROM table2 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
    
     --dbms_output.put_line('DELETE FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
     --dbms_output.put_line('INSERT INTO ' || v_tablename || ' SELECT * FROM table2 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
     --dbms_output.put_line('SELECT COUNT(sr.field3) FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
    
     execute immediate 'SELECT COUNT(sr.field3) FROM ' || v_tablename || ' sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''' into v_recordcount;
     if v_recordcount>0 then begin
         execute immediate 'DELETE FROM table2 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''';
         --dbms_output.put_line('DELETE FROM table2 sr WHERE TO_CHAR(sr.field1,''yyyy-MM-dd'') = ''' || v_bakdate || '''');
         end;
     end If;
         
     commit;
     dbms_output.put_line('Ok' || v_recordcount);
end;

2、创建JOB

--1天运行一次，当前运行第一次
begin
  sys.dbms_job.submit(job => :job,
                      what => 'data_auto_backup;',
                      next_date => sysdate,
                      interval => 'sysdate+1');
  commit;
end;
/