LightDB 表名与包名不能重复
从 LightDB 23.3 版本开始表名和包名不能重复,与 oracle 一致。原先已支持包名和schema名不能重复。
背景
在之前版本在同一schema 下可以创建相同名字的表和包。这会导致在存储过程中使用%type指定变量类型时,如果存在相同的表名和包名,会使用表的,可能会导致结果不符合预期;在表不存在的情况下才会引用包的。如下所示:
chuhx@test_o=# create table t1(key1 date);
CREATE TABLE
chuhx@test_o=# create package t1 IS
key1 real;
end;
/
CREATE PACKAGE
chuhx@test_o=# declare
val t1.key1%type = '20221212';
begin
dbms_output.serveroutput(true);
dbms_output.put_line(cast(val as varchar2(100)));
end;
/
2022-12-12
DO
chuhx@test_o=# drop table t1;
DROP TABLE
chuhx@test_o=# declare
val t1.key1%type = '20221212';
begin
dbms_output.serveroutput(true);
dbms_output.put_line(cast(val as varchar2(100)));
end;
/
2.0221212e+07
DO
在 oracle 下包名与表名不能相同,故需要支持此特性。
案例
lightdb@postgres=# create table t1(key1 int);
CREATE TABLE
lightdb@postgres=# create package t1 IS
key1 real;
end;
/
ERROR: relation "t1" already exists
HINT: A relation has the same name, so you must use a name that doesn't conflict with any existing relation.
lightdb@postgres=# drop table t1;
DROP TABLE
lightdb@postgres=# create package t1 IS
key1 real;
end;
/
CREATE PACKAGE
lightdb@postgres=# create table t1(key1 int);
ERROR: package "t1" already exists
HINT: A package has the same name, so you must use a name that doesn't conflict with any existing package.
lightdb@postgres=#