refactored/moved into dialect_oracommon.go

This commit is contained in:
Jim Lambert 2020-02-16 11:36:10 -05:00
parent 545a171442
commit dea5ee724a
2 changed files with 0 additions and 215 deletions

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package oci8
/*
Understanding Oracle
It's a bit different than the other RDBMS databases and I'll just try to
hightlight a few of the important ones the dialect has to deal with:
1. Oracle upper cases all non-quoted identifiers. That means the dialect
has to decide what to do:
1. quote all identifiers which would require developers to quote every
identifer they passed in a string to gorm.
2. only quote identifers that conflict with reserved words and leave all
other identifiers unquoted, which means Oracle will automatically
upper case them. This would allow developers to pass unquoted
identifiers in strings they passed to gorm and make the experience
align better with the other dialects.
We chose option #2.
This design decision has the following side affects:
a. you must be case insensitive when matching column names, like in
the Scope.scan function
b. Devs will have to escape reserved words when they reference them
in things like: First(&CreditCard{}, `"number" = ?`)
2. Oracle handles last inserted id a bit differently, and requires a sql.Out
parameter to return the value in the oci8 driver. Since Oracle parameters
are positional, you need to know how many other bind variables there are before
adding the returning clause. We've implemented the
OraDialect.CreateWithReturningInto(*Scope) to handle this.
3. Oracle doesn't let you specify "AS <tablename> " when selecting a count
from a dynamic table, so you just omit it. (see Scope.count() )
4. Oracle handles foreign keys a bit differently:
A. REFERENCES is implicit
B. ON UPDATE is not supported
(see scope.addForeignKey() )
5. Searching a blob requires using a function from the dbms_lob package like
instr() and specifying the offset and number of matches.
(see oci8.SearchBlob() )
6 Trailing semicolons are not allowed at the end of Oracle sql statements
(so they were removed in the unit tests)
*/

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package oci8
import (
"strings"
"sync"
)
var setupReserved sync.Once
var reservedWords map[string]struct{}
func isReserved(w string) bool {
setupReserved.Do(
func() {
words := strings.Split(reserved, "\n")
reservedWords = make(map[string]struct{}, len(words))
for _, s := range words {
reservedWords[s] = struct{}{}
}
},
)
_, ok := reservedWords[strings.ToUpper(w)]
return ok
}
const reserved = `AGGREGATE
AGGREGATES
ALL
ALLOW
ANALYZE
ANCESTOR
AND
ANY
AS
ASC
AT
AVG
BETWEEN
BINARY_DOUBLE
BINARY_FLOAT
BLOB
BRANCH
BUILD
BY
BYTE
CASE
CAST
CHAR
CHILD
CLEAR
CLOB
COMMIT
COMPILE
CONSIDER
COUNT
DATATYPE
DATE
DATE_MEASURE
DAY
DECIMAL
DELETE
DESC
DESCENDANT
DIMENSION
DISALLOW
DIVISION
DML
ELSE
END
ESCAPE
EXECUTE
FIRST
FLOAT
FOR
FROM
HIERARCHIES
HIERARCHY
HOUR
IGNORE
IN
INFINITE
INSERT
INTEGER
INTERVAL
INTO
IS
LAST
LEAF_DESCENDANT
LEAVES
LEVEL
LIKE
LIKEC
LIKE2
LIKE4
LOAD
LOCAL
LOG_SPEC
LONG
MAINTAIN
MAX
MEASURE
MEASURES
MEMBER
MEMBERS
MERGE
MLSLABEL
MIN
MINUTE
MODEL
MONTH
NAN
NCHAR
NCLOB
NO
NONE
NOT
NULL
NULLS
NUMBER
NVARCHAR2
OF
OLAP
OLAP_DML_EXPRESSION
ON
ONLY
OPERATOR
OR
ORDER
OVER
OVERFLOW
PARALLEL
PARENT
PLSQL
PRUNE
RAW
RELATIVE
ROOT_ANCESTOR
ROWID
SCN
SECOND
SELF
SERIAL
SET
SOLVE
SOME
SORT
SPEC
SUM
SYNCH
TEXT_MEASURE
THEN
TIME
TIMESTAMP
TO
UNBRANCH
UPDATE
USING
VALIDATE
VALUES
VARCHAR2
WHEN
WHERE
WITHIN
WITH
YEAR
ZERO
ZONE`