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go-zero/core/stores/builder/builder.go

83 lines
1.6 KiB
Go

package builder
import (
"fmt"
"reflect"
"strings"
)
const dbTag = "db"
// RawFieldNames converts golang struct field into slice string.
func RawFieldNames(in interface{}, postgresSql ...bool) []string {
out := make([]string, 0)
v := reflect.ValueOf(in)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
var pg bool
if len(postgresSql) > 0 {
pg = postgresSql[0]
}
// we only accept structs
if v.Kind() != reflect.Struct {
panic(fmt.Errorf("ToMap only accepts structs; got %T", v))
}
typ := v.Type()
for i := 0; i < v.NumField(); i++ {
// gets us a StructField
fi := typ.Field(i)
tagv := fi.Tag.Get(dbTag)
switch tagv {
case "-":
continue
case "":
if pg {
out = append(out, fi.Name)
} else {
out = append(out, fmt.Sprintf("`%s`", fi.Name))
}
default:
//get tag name with the tag opton, e.g.:
//`db:"id"`
//`db:"id,type=char,length=16"`
//`db:",type=char,length=16"`
if strings.Contains(tagv, ",") {
tagv = strings.TrimSpace(strings.Split(tagv, ",")[0])
}
if tagv != "" {
if pg {
out = append(out, tagv)
} else {
out = append(out, fmt.Sprintf("`%s`", tagv))
}
} else {
if pg {
out = append(out, fi.Name)
} else {
out = append(out, fmt.Sprintf("`%s`", fi.Name))
}
}
}
}
return out
}
// PostgreSqlJoin concatenates the given elements into a string.
func PostgreSqlJoin(elems []string) string {
b := new(strings.Builder)
for index, e := range elems {
b.WriteString(fmt.Sprintf("%s = $%d, ", e, index+2))
}
if b.Len() == 0 {
return b.String()
}
return b.String()[0 : b.Len()-2]
}