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builder.go
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builder.go
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package gosql
import (
"fmt"
"log"
"reflect"
"strconv"
"github.com/jmoiron/sqlx"
"github.com/jmoiron/sqlx/reflectx"
)
var (
mapper = reflectx.NewMapper("db")
//Insert database automatically updates fields
AUTO_CREATE_TIME_FIELDS = []string{
"create_time",
"create_at",
"created_at",
"update_time",
"update_at",
"updated_at",
}
//Update database automatically updates fields
AUTO_UPDATE_TIME_FIELDS = []string{
"update_time",
"update_at",
"updated_at",
}
)
//Model interface
type IModel interface {
TableName() string
DbName() string
PK() string
}
type Builder struct {
model interface{}
SQLBuilder
wrapper *Wrapper
}
// Model construct SQL from Struct
func Model(model interface{}, tx ...*sqlx.Tx) *Builder {
value := reflect.ValueOf(model)
if value.Kind() != reflect.Ptr {
log.Fatalf("model argument must pass a pointer, not a value %#v", model)
}
if value.IsNil() {
log.Fatalf("model argument cannot be nil pointer passed")
}
var txx *sqlx.Tx
if tx != nil {
txx = tx[0]
}
return &Builder{
model: model,
wrapper: &Wrapper{tx: txx},
}
}
func (b *Builder) db() ISqlx {
return b.wrapper
}
func (b *Builder) initModel() {
if m, ok := b.model.(IModel); ok {
b.wrapper.database = m.DbName()
b.table = m.TableName()
} else {
tp := reflect.Indirect(reflect.ValueOf(b.model)).Type()
if tp.Kind() != reflect.Slice {
log.Fatalf("model argument must slice, but get %#v", b.model)
}
if m, ok := reflect.Indirect(reflect.New(tp.Elem())).Interface().(IModel); ok {
b.wrapper.database = m.DbName()
b.table = m.TableName()
} else {
log.Fatalf("model argument must implementation IModel interface or slice []IModel and pointer,but get %#v", b.model)
}
}
}
//Where for example Where("id = ? and name = ?",1,"test")
func (b *Builder) Where(str string, args ...interface{}) *Builder {
b.SQLBuilder.Where(str, args...)
return b
}
//Limit
func (b *Builder) Limit(i int) *Builder {
b.limit = strconv.Itoa(i)
return b
}
//Offset
func (b *Builder) Offset(i int) *Builder {
b.offset = strconv.Itoa(i)
return b
}
//OrderBy for example "id desc"
func (b *Builder) OrderBy(str string) *Builder {
b.order = str
return b
}
func (b *Builder) reflectModel(autoTime []string) map[string]reflect.Value {
uv := reflect.Indirect(reflect.ValueOf(b.model))
fields := mapper.FieldMap(uv)
if autoTime != nil {
structAutoTime(fields, autoTime)
}
return fields
}
//All get data row from to Struct
func (b *Builder) Get(zeroValues ...string) (err error) {
b.initModel()
m := zeroValueFilter(b.reflectModel(nil), zeroValues)
//If where is empty, the primary key where condition is generated automatically
b.generateWhere(m)
return b.db().Get(b.model, b.queryString(), b.args...)
}
//All get data rows from to Struct
func (b *Builder) All() (err error) {
b.initModel()
return b.db().Select(b.model, b.queryString(), b.args...)
}
//Create data from to Struct
func (b *Builder) Create() (lastInsertId int64, err error) {
b.initModel()
fields := b.reflectModel(AUTO_CREATE_TIME_FIELDS)
m := structToMap(fields)
result, err := b.db().Exec(b.insertString(m), b.args...)
if err != nil {
return 0, err
}
return result.LastInsertId()
}
func (b *Builder) generateWhere(m map[string]interface{}) {
for k, v := range m {
b.Where(fmt.Sprintf("%s=?", k), v)
}
}
func (b *Builder) generateWhereForPK(m map[string]interface{}) {
pk := b.model.(IModel).PK()
pval, has := m[pk]
if b.where == "" && has {
b.Where(fmt.Sprintf("%s=?", pk), pval)
delete(m, pk)
}
}
//gosql.Model(&User{Id:1,Status:0}).Update("status")
func (b *Builder) Update(zeroValues ...string) (affected int64, err error) {
b.initModel()
fields := b.reflectModel(AUTO_UPDATE_TIME_FIELDS)
m := zeroValueFilter(fields, zeroValues)
//If where is empty, the primary key where condition is generated automatically
b.generateWhereForPK(m)
result, err := b.db().Exec(b.updateString(m), b.args...)
if err != nil {
return 0, err
}
return result.RowsAffected()
}
//gosql.Model(&User{Id:1}).Delete()
func (b *Builder) Delete(zeroValues ...string) (affected int64, err error) {
b.initModel()
m := zeroValueFilter(b.reflectModel(nil), zeroValues)
//If where is empty, the primary key where condition is generated automatically
b.generateWhere(m)
result, err := b.db().Exec(b.deleteString(), b.args...)
if err != nil {
return 0, err
}
return result.RowsAffected()
}
//gosql.Model(&User{}).Where("status = 0").Count()
func (b *Builder) Count(zeroValues ...string) (num int64, err error) {
b.initModel()
m := zeroValueFilter(b.reflectModel(nil), zeroValues)
//If where is empty, the primary key where condition is generated automatically
b.generateWhere(m)
err = b.db().Get(&num, b.countString(), b.args...)
return num, err
}