在 Oracle 12c 的 IDENTITY 列中通过 SQL * Loader 加载数据

Question

我需要使用 SQL* Loader 将数据加载到带有 GENERATE ALWAYS AS IDENTITY 的 Oracle 表中

CREATE TABLE tbl_identity
(
  col1 NUMBER(10,0) GENERATED ALWAYS AS IDENTITY(START WITH 7 INCREMENT BY 1)    NOT NULL,
  col2 VARCHAR2(20)
);

但是当我尝试在此表中加载数据时，出现错误

ORA-32795: cannot insert into a generated always identity column

也许 SQLLDR 中有任何选项可以暂时跳过 IDENTITY？

或者也许有任何想法如何使用 SQLLDR 将数据加载到 GENERATED ALWAYS IDENTITY 列中？

SQLLDR 命令

sqlldr userid=user/passw@TNS control=tbl_identity.ctl log=tbl_identity.log rows=1000 readsize=65535 bindsize=65535

CTL文件

OPTIONS(direct=false)
LOAD DATA
INFILE 'tbl_identity.txt'
INTO TABLE tbl_identity
INSERT
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' TRAILING NULLCOLS
(col1,
 col2)

Answer 1

将您的 DDL 从GENERATED ALWAYS更改为GENERATED BY DEFAULT

Answer 2

我在加载数据之前使用以下脚本：

begin
  for rec in (
    select owner, table_name, column_name, generation_type
    from all_tab_identity_cols
    where owner = 'owner '
      and generation_type in ('ALWAYS')
      and table_name in ('','',......)
  )loop
     -- before load data
     if rec.generation_type = 'ALWAYS' then
       execute immediate 'alter table '||rec.owner||'.'||rec.table_name||' modify '||rec.column_name||' generated by default as identity';
     end if;
     if rec.generation_type = 'BY DEFAULT' then
     -- return (after data load)
       execute immediate 'alter table '||rec.owner||'.'||rec.table_name||' modify '||rec.column_name||' generated always as identity';
     end if;
  end loop;
end;            
/

然后一切恢复原状。

小心，在查询中列出正确的表！