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request.go
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package gohst
import (
"fmt"
"reflect"
"strings"
"time"
)
type Clause struct {
Field string
Operator string
Values interface{}
}
func (e *Clause) Bake(object interface{}) (caluse string) {
// Work the field
field := e.Field
switch field {
case "Id":
field = "id"
case "CreatedAt":
field = "created_at"
case "UpdatedAt":
field = "updated_at"
default:
if strings.Contains(field, "::") {
fieldParts := strings.Split(field, "::")
field = fmt.Sprintf("(data->>'%s')::%s", fieldParts[0], fieldParts[1])
} else {
_type := TypeOf(object, field)
field = JsonName(object, field)
switch _type {
case "[]string":
field = fmt.Sprintf("_array(data,'%s')", field)
case "time.Time":
field = fmt.Sprintf("_date(data,'%s')", field)
case "int":
field = fmt.Sprintf("(data->>'%s')::int", field)
default:
field = fmt.Sprintf("data->>'%s'", field)
}
}
}
// Work the values
var value string
isSlice := reflect.TypeOf(e.Values).Kind() == reflect.Slice
if isSlice {
value = IN(e.Values)
} else {
value = process(e.Values)
}
if e.Operator == "<@" || e.Operator == "@>" {
caluse = fmt.Sprintf("%s %s %s", value, "<@", field)
} else {
caluse = fmt.Sprintf("%s %s %s", field, e.Operator, value)
}
return
}
func process(value interface{}) string {
var _type reflect.Type
_type = reflect.TypeOf(value)
_kind := _type.Kind()
switch {
case _kind >= reflect.Int && _kind <= reflect.Float64:
return fmt.Sprintf("%v", value)
case _kind == reflect.String:
if strings.Contains(value.(string), "$") {
return fmt.Sprintf("%v", value)
} else {
return fmt.Sprintf("'%v'", value)
}
case _kind == reflect.Bool:
return fmt.Sprintf("%t", value)
case _type == reflect.TypeOf(time.Now()):
return "'" + value.(time.Time).Format(time.RFC3339) + "'"
case _kind == reflect.Struct:
_id := reflect.ValueOf(value).FieldByName("Id")
if _id.Kind() == reflect.Invalid {
return ""
} else {
return fmt.Sprintf("%v", _id.Interface())
}
}
return ""
}
type Requester interface {
Bake(object interface{}) string
}
// Prepared Statement Caller
type PreparedStatement struct {
name string
}
func (ps *PreparedStatement) Bake(object interface{}) string {
return ps.name
}
// SQL Request Builder
type RequestChain struct {
clauses []Clause
operations []string
isGroupOpen bool
}
func (rc *RequestChain) Where(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
rc.operations = append(rc.operations, "WHERE")
return rc
}
func (rc *RequestChain) And(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
rc.operations = append(rc.operations, "AND")
return rc
}
func (rc *RequestChain) Or(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
rc.operations = append(rc.operations, "Or")
return rc
}
func (rc *RequestChain) WhereGroup(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
rc.operations = append(rc.operations, "WHERE (")
rc.isGroupOpen = true
return rc
}
func (rc *RequestChain) AndGroup(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
if rc.isGroupOpen {
rc.operations = append(rc.operations, ") AND (")
} else {
rc.operations = append(rc.operations, "AND (")
rc.isGroupOpen = true
}
return rc
}
func (rc *RequestChain) OrGroup(e Clause) *RequestChain {
rc.clauses = append(rc.clauses, e)
if rc.isGroupOpen {
rc.operations = append(rc.operations, ") OR (")
} else {
rc.operations = append(rc.operations, "OR (")
rc.isGroupOpen = true
}
return rc
}
func (rc *RequestChain) Bake(object interface{}) string {
conditions := ""
for idx, op := range rc.operations {
conditions += fmt.Sprintf("%s %s", op, rc.clauses[idx].Bake(object))
}
if rc.isGroupOpen {
conditions += ")"
}
return conditions
}
// This takes a slice and an optional boolean, the slice get converted to a sql list,
// if the boolean is based as true, then the list will be constructed as an sql array,
// if any other type is based than a slice and empty string is returned.
func IN(_slice interface{}, params ...bool) (values string) {
_type := reflect.TypeOf(_slice)
_typeName := _type.String()
if !strings.Contains(_typeName, "[]") {
return
}
// Time thus convert to a slice of strings of time.RFC3339
if _typeName == "[]time.Time" {
times := _slice.([]time.Time)
fomats := make([]string, len(times))
for index, value := range times {
fomats[index] = value.Format(time.RFC3339)
}
_slice = fomats
}
// Objects thus get their Ids as []int64
if _typeName != "[]time.Time" && _type.Elem().Kind() == reflect.Struct {
length := reflect.ValueOf(_slice).Len()
ids := make([]interface{}, length)
for index := 0; index < length; index++ {
object := reflect.ValueOf(_slice).Index(index)
ids[index] = object.FieldByName("Id").Interface()
}
_slice = ids
}
isArray := len(params) > 0 && params[0]
values = fmt.Sprintf("%v", _slice)
values = strings.Trim(values, "[]")
seperator := "','"
surrounder := "'%s'"
brackets := "(%s)"
if isArray {
seperator = "\",\""
surrounder = "\"%s\""
brackets = "{%s}"
}
if _typeName != "[]string" && _typeName != "[]time.Time" {
seperator = ","
surrounder = "%s"
}
values = strings.Replace(values, " ", seperator, -1)
values = fmt.Sprintf(surrounder, values)
values = fmt.Sprintf(brackets, values)
return
}