forked from upper/db
/
comparison.go
127 lines (100 loc) · 2.8 KB
/
comparison.go
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package sqlbuilder
import (
"fmt"
"strings"
db "upper.io/db.v3"
"upper.io/db.v3/internal/sqladapter/exql"
)
var comparisonOperators = map[db.ComparisonOperator]string{
db.ComparisonOperatorEqual: "=",
db.ComparisonOperatorNotEqual: "!=",
db.ComparisonOperatorLessThan: "<",
db.ComparisonOperatorGreaterThan: ">",
db.ComparisonOperatorLessThanOrEqualTo: "<=",
db.ComparisonOperatorGreaterThanOrEqualTo: ">=",
db.ComparisonOperatorBetween: "BETWEEN",
db.ComparisonOperatorNotBetween: "NOT BETWEEN",
db.ComparisonOperatorIn: "IN",
db.ComparisonOperatorNotIn: "NOT IN",
db.ComparisonOperatorIs: "IS",
db.ComparisonOperatorIsNot: "IS NOT",
db.ComparisonOperatorLike: "LIKE",
db.ComparisonOperatorNotLike: "NOT LIKE",
db.ComparisonOperatorRegExp: "REGEXP",
db.ComparisonOperatorNotRegExp: "NOT REGEXP",
}
type hasCustomOperator interface {
CustomOperator() string
}
type operatorWrapper struct {
tu *templateWithUtils
cv *exql.ColumnValue
op db.Comparison
v interface{}
}
func (ow *operatorWrapper) cmp() db.Comparison {
if ow.op != nil {
return ow.op
}
if ow.cv.Operator != "" {
return db.Op(ow.cv.Operator, ow.v)
}
if ow.v == nil {
return db.Is(nil)
}
args, isSlice := toInterfaceArguments(ow.v)
if isSlice {
return db.In(args)
}
return db.Eq(ow.v)
}
func (ow *operatorWrapper) preprocess() (string, []interface{}) {
placeholder := "?"
column, err := ow.cv.Column.Compile(ow.tu.Template)
if err != nil {
panic(fmt.Sprintf("could not compile column: %v", err.Error()))
}
c := ow.cmp()
op := ow.tu.comparisonOperatorMapper(c.Operator())
var args []interface{}
switch c.Operator() {
case db.ComparisonOperatorNone:
if c, ok := c.(hasCustomOperator); ok {
op = c.CustomOperator()
} else {
panic("no operator given")
}
case db.ComparisonOperatorIn, db.ComparisonOperatorNotIn:
values := c.Value().([]interface{})
if len(values) < 1 {
placeholder, args = "(NULL)", []interface{}{}
break
}
placeholder, args = "(?"+strings.Repeat(", ?", len(values)-1)+")", values
case db.ComparisonOperatorIs, db.ComparisonOperatorIsNot:
switch c.Value() {
case nil:
placeholder, args = "NULL", []interface{}{}
case false:
placeholder, args = "FALSE", []interface{}{}
case true:
placeholder, args = "TRUE", []interface{}{}
}
case db.ComparisonOperatorBetween, db.ComparisonOperatorNotBetween:
values := c.Value().([]interface{})
placeholder, args = "? AND ?", []interface{}{values[0], values[1]}
case db.ComparisonOperatorEqual:
v := c.Value()
if b, ok := v.([]byte); ok {
v = string(b)
}
args = []interface{}{v}
}
if args == nil {
args = []interface{}{c.Value()}
}
if strings.Contains(op, ":column") {
return strings.Replace(op, ":column", column, -1), args
}
return column + " " + op + " " + placeholder, args
}