db_postgres.go
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package orm
import (
"fmt"
"strconv"
)
var postgresOperators = map[string]string{
"exact": "= ?",
"iexact": "= UPPER(?)",
"contains": "LIKE ?",
"icontains": "LIKE UPPER(?)",
"gt": "> ?",
"gte": ">= ?",
"lt": "< ?",
"lte": "<= ?",
"startswith": "LIKE ?",
"endswith": "LIKE ?",
"istartswith": "LIKE UPPER(?)",
"iendswith": "LIKE UPPER(?)",
}
type dbBasePostgres struct {
dbBase
}
var _ dbBaser = new(dbBasePostgres)
func (d *dbBasePostgres) OperatorSql(operator string) string {
return postgresOperators[operator]
}
func (d *dbBasePostgres) GenerateOperatorLeftCol(fi *fieldInfo, operator string, leftCol *string) {
switch operator {
case "contains", "startswith", "endswith":
*leftCol = fmt.Sprintf("%s::text", *leftCol)
case "iexact", "icontains", "istartswith", "iendswith":
*leftCol = fmt.Sprintf("UPPER(%s::text)", *leftCol)
}
}
func (d *dbBasePostgres) SupportUpdateJoin() bool {
return false
}
func (d *dbBasePostgres) MaxLimit() uint64 {
return 0
}
func (d *dbBasePostgres) TableQuote() string {
return `"`
}
func (d *dbBasePostgres) ReplaceMarks(query *string) {
q := *query
num := 0
for _, c := range q {
if c == '?' {
num += 1
}
}
if num == 0 {
return
}
data := make([]byte, 0, len(q)+num)
num = 1
for i := 0; i < len(q); i++ {
c := q[i]
if c == '?' {
data = append(data, '$')
data = append(data, []byte(strconv.Itoa(num))...)
num += 1
} else {
data = append(data, c)
}
}
*query = string(data)
}
func (d *dbBasePostgres) HasReturningID(mi *modelInfo, query *string) (has bool) {
if mi.fields.pk.auto {
if query != nil {
*query = fmt.Sprintf(`%s RETURNING "%s"`, *query, mi.fields.pk.column)
}
has = true
}
return
}
func newdbBasePostgres() dbBaser {
b := new(dbBasePostgres)
b.ins = b
return b
}