oralce存储过程实现不同用户之间的表数据复制

create or replace procedure prc_test123 is
    temp_columns varchar2(4000);
    sqltemp varchar(20000);
    cursor cur is select table_name from  user_tables a where a.table_name like 'ZY%';
    c_row cur%rowtype;
    cursor t_cur(tablename varchar2) is select column_name from user_tab_columns a where a.table_name=tablename order BY column_name;
    --type table_cur_type is ref cursor;
    primaryLKey varchar2(20);
begin
      for c_row in cur loop
        temp_columns:='';
        for t_c_row in t_cur(c_row.table_name) loop
            if temp_columns is null or temp_columns='' then
                dbms_output.put_line(temp_columns);
                temp_columns:=t_c_row.column_name;
            else 
                temp_columns:=temp_columns||','||t_c_row.column_name;
            end if;
        end loop;
        --取出主键
        select column_name into primaryLKey from user_cons_columns cu, 
        user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name =c_row.table_name;
        --插入没有的主键数据
        sqltemp:='insert into '||c_row.table_name ||' a ('||temp_columns||')  SELECT  '||temp_columns||'  from data_manage.'||c_row.table_name ||' b where not exists(select 1 from '||c_row.table_name ||' c where c.'||primaryLKey||'=b.'||primaryLKey||')';
        execute immediate  sqltemp;
        --更新已有的主键数据
        sqltemp:='update '||c_row.table_name ||' a set ('||temp_columns||') = (SELECT  '||temp_columns||'  from data_manage.'||c_row.table_name ||' b where  b.'||primaryLKey||'=a.'||primaryLKey||') where exists(select 1 from data_manage.'||c_row.table_name||' y where a.'||primaryLKey||'=y.'||primaryLKey||')';
        execute immediate  sqltemp;
      end loop;
end;

 　　对于不同用户下同一张表的数据进行复制，已有数据进行更新，没有的数据进行插入