refactored/moved into dialect_oracommon.go
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Jim Lambert
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package oci8
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/*
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Understanding Oracle
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It's a bit different than the other RDBMS databases and I'll just try to
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hightlight a few of the important ones the dialect has to deal with:
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1. Oracle upper cases all non-quoted identifiers. That means the dialect
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has to decide what to do:
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1. quote all identifiers which would require developers to quote every
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identifer they passed in a string to gorm.
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2. only quote identifers that conflict with reserved words and leave all
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other identifiers unquoted, which means Oracle will automatically
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upper case them. This would allow developers to pass unquoted
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identifiers in strings they passed to gorm and make the experience
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align better with the other dialects.
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We chose option #2.
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This design decision has the following side affects:
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a. you must be case insensitive when matching column names, like in
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the Scope.scan function
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b. Devs will have to escape reserved words when they reference them
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in things like: First(&CreditCard{}, `"number" = ?`)
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2. Oracle handles last inserted id a bit differently, and requires a sql.Out
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parameter to return the value in the oci8 driver. Since Oracle parameters
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are positional, you need to know how many other bind variables there are before
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adding the returning clause. We've implemented the
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OraDialect.CreateWithReturningInto(*Scope) to handle this.
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3. Oracle doesn't let you specify "AS <tablename> " when selecting a count
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from a dynamic table, so you just omit it. (see Scope.count() )
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4. Oracle handles foreign keys a bit differently:
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A. REFERENCES is implicit
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B. ON UPDATE is not supported
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(see scope.addForeignKey() )
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5. Searching a blob requires using a function from the dbms_lob package like
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instr() and specifying the offset and number of matches.
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(see oci8.SearchBlob() )
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6 Trailing semicolons are not allowed at the end of Oracle sql statements
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(so they were removed in the unit tests)
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*/
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@ -1,166 +0,0 @@
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package oci8
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import (
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"strings"
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"sync"
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)
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var setupReserved sync.Once
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var reservedWords map[string]struct{}
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func isReserved(w string) bool {
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setupReserved.Do(
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func() {
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words := strings.Split(reserved, "\n")
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reservedWords = make(map[string]struct{}, len(words))
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for _, s := range words {
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reservedWords[s] = struct{}{}
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}
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},
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)
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_, ok := reservedWords[strings.ToUpper(w)]
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return ok
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}
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const reserved = `AGGREGATE
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AGGREGATES
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ALL
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ALLOW
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ANALYZE
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ANCESTOR
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AND
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ANY
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AS
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ASC
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AT
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AVG
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BETWEEN
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BINARY_DOUBLE
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BINARY_FLOAT
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BLOB
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BRANCH
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BUILD
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BY
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BYTE
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CASE
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CAST
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CHAR
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CHILD
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CLEAR
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CLOB
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COMMIT
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COMPILE
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CONSIDER
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COUNT
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DATATYPE
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DATE
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DATE_MEASURE
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DAY
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DECIMAL
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DELETE
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DESC
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DESCENDANT
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DIMENSION
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DISALLOW
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DIVISION
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DML
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ELSE
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END
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ESCAPE
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EXECUTE
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FIRST
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FLOAT
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FOR
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FROM
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HIERARCHIES
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HIERARCHY
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HOUR
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IGNORE
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IN
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INFINITE
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INSERT
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INTEGER
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INTERVAL
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INTO
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IS
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LAST
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LEAF_DESCENDANT
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LEAVES
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LEVEL
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LIKE
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LIKEC
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LIKE2
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LIKE4
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LOAD
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LOCAL
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LOG_SPEC
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LONG
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MAINTAIN
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MAX
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MEASURE
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MEASURES
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MEMBER
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MEMBERS
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MERGE
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MLSLABEL
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MIN
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MINUTE
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MODEL
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MONTH
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NAN
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NCHAR
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NCLOB
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NO
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NONE
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NOT
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NULL
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NULLS
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NUMBER
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NVARCHAR2
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OF
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OLAP
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OLAP_DML_EXPRESSION
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ON
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ONLY
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OPERATOR
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OR
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ORDER
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OVER
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OVERFLOW
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PARALLEL
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PARENT
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PLSQL
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PRUNE
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RAW
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RELATIVE
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ROOT_ANCESTOR
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ROWID
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SCN
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SECOND
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SELF
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SERIAL
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SET
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SOLVE
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SOME
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SORT
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SPEC
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SUM
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SYNCH
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TEXT_MEASURE
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THEN
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TIME
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TIMESTAMP
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TO
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UNBRANCH
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UPDATE
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USING
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VALIDATE
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VALUES
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VARCHAR2
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WHEN
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WHERE
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WITHIN
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WITH
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YEAR
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ZERO
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ZONE`
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