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|
--
-- CHAR
--
-- Per SQL standard, CHAR means character(1), that is a varlena type
-- with a constraint restricting it to one character (not byte)
SELECT char 'c' = char 'c' AS true;
true
------
t
(1 row)
--
-- Build a table for testing
-- (This temporarily hides the table created in test_setup.sql)
--
CREATE TEMP TABLE CHAR_TBL(f1 char);
INSERT INTO CHAR_TBL (f1) VALUES ('a');
INSERT INTO CHAR_TBL (f1) VALUES ('A');
-- any of the following three input formats are acceptable
INSERT INTO CHAR_TBL (f1) VALUES ('1');
INSERT INTO CHAR_TBL (f1) VALUES (2);
INSERT INTO CHAR_TBL (f1) VALUES ('3');
-- zero-length char
INSERT INTO CHAR_TBL (f1) VALUES ('');
-- try char's of greater than 1 length
INSERT INTO CHAR_TBL (f1) VALUES ('cd');
ERROR: value too long for type character(1)
INSERT INTO CHAR_TBL (f1) VALUES ('c ');
SELECT * FROM CHAR_TBL;
f1
----
a
A
1
2
3
c
(7 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 <> 'a';
f1
----
A
1
2
3
c
(6 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 = 'a';
f1
----
a
(1 row)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 < 'a';
f1
----
(1 row)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 <= 'a';
f1
----
a
(2 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 > 'a';
f1
----
A
1
2
3
c
(5 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 >= 'a';
f1
----
a
A
1
2
3
c
(6 rows)
DROP TABLE CHAR_TBL;
--
-- Now test longer arrays of char
--
-- This char_tbl was already created and filled in test_setup.sql.
-- Here we just try to insert bad values.
--
INSERT INTO CHAR_TBL (f1) VALUES ('abcde');
ERROR: value too long for type character(4)
SELECT * FROM CHAR_TBL;
f1
------
a
ab
abcd
abcd
(4 rows)
-- Also try it with non-error-throwing API
SELECT pg_input_is_valid('abcd ', 'char(4)');
pg_input_is_valid
-------------------
t
(1 row)
SELECT pg_input_is_valid('abcde', 'char(4)');
pg_input_is_valid
-------------------
f
(1 row)
SELECT * FROM pg_input_error_info('abcde', 'char(4)');
message | detail | hint | sql_error_code
--------------------------------------+--------+------+----------------
value too long for type character(4) | | | 22001
(1 row)
--
-- Also test "char", which is an ad-hoc one-byte type. It can only
-- really store ASCII characters, but we allow high-bit-set characters
-- to be accessed via bytea-like escapes.
--
SELECT 'a'::"char";
char
------
a
(1 row)
SELECT '\101'::"char";
char
------
A
(1 row)
SELECT '\377'::"char";
char
------
\377
(1 row)
SELECT 'a'::"char"::text;
text
------
a
(1 row)
SELECT '\377'::"char"::text;
text
------
\377
(1 row)
SELECT '\000'::"char"::text;
text
------
(1 row)
SELECT 'a'::text::"char";
char
------
a
(1 row)
SELECT '\377'::text::"char";
char
------
\377
(1 row)
SELECT ''::text::"char";
char
------
(1 row)
|
