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db.go
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db.go
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// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package orm
import (
"database/sql"
"errors"
"fmt"
"reflect"
"strings"
"time"
)
const (
format_Date = "2006-01-02"
format_DateTime = "2006-01-02 15:04:05"
)
var (
ErrMissPK = errors.New("missed pk value") // missing pk error
)
var (
operators = map[string]bool{
"exact": true,
"iexact": true,
"contains": true,
"icontains": true,
// "regex": true,
// "iregex": true,
"gt": true,
"gte": true,
"lt": true,
"lte": true,
"startswith": true,
"endswith": true,
"istartswith": true,
"iendswith": true,
"in": true,
"between": true,
// "year": true,
// "month": true,
// "day": true,
// "week_day": true,
"isnull": true,
// "search": true,
}
)
// an instance of dbBaser interface/
type dbBase struct {
ins dbBaser
}
// check dbBase implements dbBaser interface.
var _ dbBaser = new(dbBase)
// get struct columns values as interface slice.
func (d *dbBase) collectValues(mi *modelInfo, ind reflect.Value, cols []string, skipAuto bool, insert bool, names *[]string, tz *time.Location) (values []interface{}, err error) {
var columns []string
if names != nil {
columns = *names
}
for _, column := range cols {
var fi *fieldInfo
if fi, _ = mi.fields.GetByAny(column); fi != nil {
column = fi.column
} else {
panic(fmt.Errorf("wrong db field/column name `%s` for model `%s`", column, mi.fullName))
}
if fi.dbcol == false || fi.auto && skipAuto {
continue
}
value, err := d.collectFieldValue(mi, fi, ind, insert, tz)
if err != nil {
return nil, err
}
if names != nil {
columns = append(columns, column)
}
values = append(values, value)
}
if names != nil {
*names = columns
}
return
}
// get one field value in struct column as interface.
func (d *dbBase) collectFieldValue(mi *modelInfo, fi *fieldInfo, ind reflect.Value, insert bool, tz *time.Location) (interface{}, error) {
var value interface{}
if fi.pk {
_, value, _ = getExistPk(mi, ind)
} else {
field := ind.Field(fi.fieldIndex)
if fi.isFielder {
f := field.Addr().Interface().(Fielder)
value = f.RawValue()
} else {
switch fi.fieldType {
case TypeBooleanField:
if nb, ok := field.Interface().(sql.NullBool); ok {
value = nil
if nb.Valid {
value = nb.Bool
}
} else if field.Kind() == reflect.Ptr {
if field.IsNil() {
value = nil
} else {
value = field.Elem().Bool()
}
} else {
value = field.Bool()
}
case TypeCharField, TypeTextField:
if ns, ok := field.Interface().(sql.NullString); ok {
value = nil
if ns.Valid {
value = ns.String
}
} else if field.Kind() == reflect.Ptr {
if field.IsNil() {
value = nil
} else {
value = field.Elem().String()
}
} else {
value = field.String()
}
case TypeFloatField, TypeDecimalField:
if nf, ok := field.Interface().(sql.NullFloat64); ok {
value = nil
if nf.Valid {
value = nf.Float64
}
} else if field.Kind() == reflect.Ptr {
if field.IsNil() {
value = nil
} else {
value = field.Elem().Float()
}
} else {
vu := field.Interface()
if _, ok := vu.(float32); ok {
value, _ = StrTo(ToStr(vu)).Float64()
} else {
value = field.Float()
}
}
case TypeDateField, TypeDateTimeField:
value = field.Interface()
if t, ok := value.(time.Time); ok {
d.ins.TimeToDB(&t, tz)
if t.IsZero() {
value = nil
} else {
value = t
}
}
default:
switch {
case fi.fieldType&IsPostiveIntegerField > 0:
if field.Kind() == reflect.Ptr {
if field.IsNil() {
value = nil
} else {
value = field.Elem().Uint()
}
} else {
value = field.Uint()
}
case fi.fieldType&IsIntegerField > 0:
if ni, ok := field.Interface().(sql.NullInt64); ok {
value = nil
if ni.Valid {
value = ni.Int64
}
} else if field.Kind() == reflect.Ptr {
if field.IsNil() {
value = nil
} else {
value = field.Elem().Int()
}
} else {
value = field.Int()
}
case fi.fieldType&IsRelField > 0:
if field.IsNil() {
value = nil
} else {
if _, vu, ok := getExistPk(fi.relModelInfo, reflect.Indirect(field)); ok {
value = vu
} else {
value = nil
}
}
if fi.null == false && value == nil {
return nil, errors.New(fmt.Sprintf("field `%s` cannot be NULL", fi.fullName))
}
}
}
}
switch fi.fieldType {
case TypeDateField, TypeDateTimeField:
if fi.auto_now || fi.auto_now_add && insert {
if insert {
if t, ok := value.(time.Time); ok && !t.IsZero() {
break
}
}
tnow := time.Now()
d.ins.TimeToDB(&tnow, tz)
value = tnow
if fi.isFielder {
f := field.Addr().Interface().(Fielder)
f.SetRaw(tnow.In(DefaultTimeLoc))
} else {
field.Set(reflect.ValueOf(tnow.In(DefaultTimeLoc)))
}
}
}
}
return value, nil
}
// create insert sql preparation statement object.
func (d *dbBase) PrepareInsert(q dbQuerier, mi *modelInfo) (stmtQuerier, string, error) {
Q := d.ins.TableQuote()
dbcols := make([]string, 0, len(mi.fields.dbcols))
marks := make([]string, 0, len(mi.fields.dbcols))
for _, fi := range mi.fields.fieldsDB {
if fi.auto == false {
dbcols = append(dbcols, fi.column)
marks = append(marks, "?")
}
}
qmarks := strings.Join(marks, ", ")
sep := fmt.Sprintf("%s, %s", Q, Q)
columns := strings.Join(dbcols, sep)
query := fmt.Sprintf("INSERT INTO %s%s%s (%s%s%s) VALUES (%s)", Q, mi.table, Q, Q, columns, Q, qmarks)
d.ins.ReplaceMarks(&query)
d.ins.HasReturningID(mi, &query)
stmt, err := q.Prepare(query)
return stmt, query, err
}
// insert struct with prepared statement and given struct reflect value.
func (d *dbBase) InsertStmt(stmt stmtQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location) (int64, error) {
values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, nil, tz)
if err != nil {
return 0, err
}
if d.ins.HasReturningID(mi, nil) {
row := stmt.QueryRow(values...)
var id int64
err := row.Scan(&id)
return id, err
} else {
if res, err := stmt.Exec(values...); err == nil {
return res.LastInsertId()
} else {
return 0, err
}
}
}
// query sql ,read records and persist in dbBaser.
func (d *dbBase) Read(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location, cols []string) error {
var whereCols []string
var args []interface{}
// if specify cols length > 0, then use it for where condition.
if len(cols) > 0 {
var err error
whereCols = make([]string, 0, len(cols))
args, err = d.collectValues(mi, ind, cols, false, false, &whereCols, tz)
if err != nil {
return err
}
} else {
// default use pk value as where condtion.
pkColumn, pkValue, ok := getExistPk(mi, ind)
if ok == false {
return ErrMissPK
}
whereCols = []string{pkColumn}
args = append(args, pkValue)
}
Q := d.ins.TableQuote()
sep := fmt.Sprintf("%s, %s", Q, Q)
sels := strings.Join(mi.fields.dbcols, sep)
colsNum := len(mi.fields.dbcols)
sep = fmt.Sprintf("%s = ? AND %s", Q, Q)
wheres := strings.Join(whereCols, sep)
query := fmt.Sprintf("SELECT %s%s%s FROM %s%s%s WHERE %s%s%s = ?", Q, sels, Q, Q, mi.table, Q, Q, wheres, Q)
refs := make([]interface{}, colsNum)
for i, _ := range refs {
var ref interface{}
refs[i] = &ref
}
d.ins.ReplaceMarks(&query)
row := q.QueryRow(query, args...)
if err := row.Scan(refs...); err != nil {
if err == sql.ErrNoRows {
return ErrNoRows
}
return err
} else {
elm := reflect.New(mi.addrField.Elem().Type())
mind := reflect.Indirect(elm)
d.setColsValues(mi, &mind, mi.fields.dbcols, refs, tz)
ind.Set(mind)
}
return nil
}
// execute insert sql dbQuerier with given struct reflect.Value.
func (d *dbBase) Insert(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location) (int64, error) {
names := make([]string, 0, len(mi.fields.dbcols)-1)
values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, &names, tz)
if err != nil {
return 0, err
}
return d.InsertValue(q, mi, false, names, values)
}
// multi-insert sql with given slice struct reflect.Value.
func (d *dbBase) InsertMulti(q dbQuerier, mi *modelInfo, sind reflect.Value, bulk int, tz *time.Location) (int64, error) {
var (
cnt int64
nums int
values []interface{}
names []string
)
// typ := reflect.Indirect(mi.addrField).Type()
length := sind.Len()
for i := 1; i <= length; i++ {
ind := reflect.Indirect(sind.Index(i - 1))
// Is this needed ?
// if !ind.Type().AssignableTo(typ) {
// return cnt, ErrArgs
// }
if i == 1 {
vus, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, &names, tz)
if err != nil {
return cnt, err
}
values = make([]interface{}, bulk*len(vus))
nums += copy(values, vus)
} else {
vus, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, nil, tz)
if err != nil {
return cnt, err
}
if len(vus) != len(names) {
return cnt, ErrArgs
}
nums += copy(values[nums:], vus)
}
if i > 1 && i%bulk == 0 || length == i {
num, err := d.InsertValue(q, mi, true, names, values[:nums])
if err != nil {
return cnt, err
}
cnt += num
nums = 0
}
}
return cnt, nil
}
// execute insert sql with given struct and given values.
// insert the given values, not the field values in struct.
func (d *dbBase) InsertValue(q dbQuerier, mi *modelInfo, isMulti bool, names []string, values []interface{}) (int64, error) {
Q := d.ins.TableQuote()
marks := make([]string, len(names))
for i, _ := range marks {
marks[i] = "?"
}
sep := fmt.Sprintf("%s, %s", Q, Q)
qmarks := strings.Join(marks, ", ")
columns := strings.Join(names, sep)
multi := len(values) / len(names)
if isMulti {
qmarks = strings.Repeat(qmarks+"), (", multi-1) + qmarks
}
query := fmt.Sprintf("INSERT INTO %s%s%s (%s%s%s) VALUES (%s)", Q, mi.table, Q, Q, columns, Q, qmarks)
d.ins.ReplaceMarks(&query)
if isMulti || !d.ins.HasReturningID(mi, &query) {
if res, err := q.Exec(query, values...); err == nil {
if isMulti {
return res.RowsAffected()
}
return res.LastInsertId()
} else {
return 0, err
}
} else {
row := q.QueryRow(query, values...)
var id int64
err := row.Scan(&id)
return id, err
}
}
// execute update sql dbQuerier with given struct reflect.Value.
func (d *dbBase) Update(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location, cols []string) (int64, error) {
pkName, pkValue, ok := getExistPk(mi, ind)
if ok == false {
return 0, ErrMissPK
}
var setNames []string
// if specify cols length is zero, then commit all columns.
if len(cols) == 0 {
cols = mi.fields.dbcols
setNames = make([]string, 0, len(mi.fields.dbcols)-1)
} else {
setNames = make([]string, 0, len(cols))
}
setValues, err := d.collectValues(mi, ind, cols, true, false, &setNames, tz)
if err != nil {
return 0, err
}
setValues = append(setValues, pkValue)
Q := d.ins.TableQuote()
sep := fmt.Sprintf("%s = ?, %s", Q, Q)
setColumns := strings.Join(setNames, sep)
query := fmt.Sprintf("UPDATE %s%s%s SET %s%s%s = ? WHERE %s%s%s = ?", Q, mi.table, Q, Q, setColumns, Q, Q, pkName, Q)
d.ins.ReplaceMarks(&query)
if res, err := q.Exec(query, setValues...); err == nil {
return res.RowsAffected()
} else {
return 0, err
}
}
// execute delete sql dbQuerier with given struct reflect.Value.
// delete index is pk.
func (d *dbBase) Delete(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location) (int64, error) {
pkName, pkValue, ok := getExistPk(mi, ind)
if ok == false {
return 0, ErrMissPK
}
Q := d.ins.TableQuote()
query := fmt.Sprintf("DELETE FROM %s%s%s WHERE %s%s%s = ?", Q, mi.table, Q, Q, pkName, Q)
d.ins.ReplaceMarks(&query)
if res, err := q.Exec(query, pkValue); err == nil {
num, err := res.RowsAffected()
if err != nil {
return 0, err
}
if num > 0 {
if mi.fields.pk.auto {
if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
ind.Field(mi.fields.pk.fieldIndex).SetUint(0)
} else {
ind.Field(mi.fields.pk.fieldIndex).SetInt(0)
}
}
err := d.deleteRels(q, mi, []interface{}{pkValue}, tz)
if err != nil {
return num, err
}
}
return num, err
} else {
return 0, err
}
}
// update table-related record by querySet.
// need querySet not struct reflect.Value to update related records.
func (d *dbBase) UpdateBatch(q dbQuerier, qs *querySet, mi *modelInfo, cond *Condition, params Params, tz *time.Location) (int64, error) {
columns := make([]string, 0, len(params))
values := make([]interface{}, 0, len(params))
for col, val := range params {
if fi, ok := mi.fields.GetByAny(col); ok == false || fi.dbcol == false {
panic(fmt.Errorf("wrong field/column name `%s`", col))
} else {
columns = append(columns, fi.column)
values = append(values, val)
}
}
if len(columns) == 0 {
panic(fmt.Errorf("update params cannot empty"))
}
tables := newDbTables(mi, d.ins)
if qs != nil {
tables.parseRelated(qs.related, qs.relDepth)
}
where, args := tables.getCondSql(cond, false, tz)
values = append(values, args...)
join := tables.getJoinSql()
var query, T string
Q := d.ins.TableQuote()
if d.ins.SupportUpdateJoin() {
T = "T0."
}
cols := make([]string, 0, len(columns))
for i, v := range columns {
col := fmt.Sprintf("%s%s%s%s", T, Q, v, Q)
if c, ok := values[i].(colValue); ok {
switch c.opt {
case Col_Add:
cols = append(cols, col+" = "+col+" + ?")
case Col_Minus:
cols = append(cols, col+" = "+col+" - ?")
case Col_Multiply:
cols = append(cols, col+" = "+col+" * ?")
case Col_Except:
cols = append(cols, col+" = "+col+" / ?")
}
values[i] = c.value
} else {
cols = append(cols, col+" = ?")
}
}
sets := strings.Join(cols, ", ") + " "
if d.ins.SupportUpdateJoin() {
query = fmt.Sprintf("UPDATE %s%s%s T0 %sSET %s%s", Q, mi.table, Q, join, sets, where)
} else {
supQuery := fmt.Sprintf("SELECT T0.%s%s%s FROM %s%s%s T0 %s%s", Q, mi.fields.pk.column, Q, Q, mi.table, Q, join, where)
query = fmt.Sprintf("UPDATE %s%s%s SET %sWHERE %s%s%s IN ( %s )", Q, mi.table, Q, sets, Q, mi.fields.pk.column, Q, supQuery)
}
d.ins.ReplaceMarks(&query)
if res, err := q.Exec(query, values...); err == nil {
return res.RowsAffected()
} else {
return 0, err
}
}
// delete related records.
// do UpdateBanch or DeleteBanch by condition of tables' relationship.
func (d *dbBase) deleteRels(q dbQuerier, mi *modelInfo, args []interface{}, tz *time.Location) error {
for _, fi := range mi.fields.fieldsReverse {
fi = fi.reverseFieldInfo
switch fi.onDelete {
case od_CASCADE:
cond := NewCondition().And(fmt.Sprintf("%s__in", fi.name), args...)
_, err := d.DeleteBatch(q, nil, fi.mi, cond, tz)
if err != nil {
return err
}
case od_SET_DEFAULT, od_SET_NULL:
cond := NewCondition().And(fmt.Sprintf("%s__in", fi.name), args...)
params := Params{fi.column: nil}
if fi.onDelete == od_SET_DEFAULT {
params[fi.column] = fi.initial.String()
}
_, err := d.UpdateBatch(q, nil, fi.mi, cond, params, tz)
if err != nil {
return err
}
case od_DO_NOTHING:
}
}
return nil
}
// delete table-related records.
func (d *dbBase) DeleteBatch(q dbQuerier, qs *querySet, mi *modelInfo, cond *Condition, tz *time.Location) (int64, error) {
tables := newDbTables(mi, d.ins)
tables.skipEnd = true
if qs != nil {
tables.parseRelated(qs.related, qs.relDepth)
}
if cond == nil || cond.IsEmpty() {
panic(fmt.Errorf("delete operation cannot execute without condition"))
}
Q := d.ins.TableQuote()
where, args := tables.getCondSql(cond, false, tz)
join := tables.getJoinSql()
cols := fmt.Sprintf("T0.%s%s%s", Q, mi.fields.pk.column, Q)
query := fmt.Sprintf("SELECT %s FROM %s%s%s T0 %s%s", cols, Q, mi.table, Q, join, where)
d.ins.ReplaceMarks(&query)
var rs *sql.Rows
if r, err := q.Query(query, args...); err != nil {
return 0, err
} else {
rs = r
}
defer rs.Close()
var ref interface{}
args = make([]interface{}, 0)
cnt := 0
for rs.Next() {
if err := rs.Scan(&ref); err != nil {
return 0, err
}
args = append(args, reflect.ValueOf(ref).Interface())
cnt++
}
if cnt == 0 {
return 0, nil
}
marks := make([]string, len(args))
for i, _ := range marks {
marks[i] = "?"
}
sql := fmt.Sprintf("IN (%s)", strings.Join(marks, ", "))
query = fmt.Sprintf("DELETE FROM %s%s%s WHERE %s%s%s %s", Q, mi.table, Q, Q, mi.fields.pk.column, Q, sql)
d.ins.ReplaceMarks(&query)
if res, err := q.Exec(query, args...); err == nil {
num, err := res.RowsAffected()
if err != nil {
return 0, err
}
if num > 0 {
err := d.deleteRels(q, mi, args, tz)
if err != nil {
return num, err
}
}
return num, nil
} else {
return 0, err
}
}
// read related records.
func (d *dbBase) ReadBatch(q dbQuerier, qs *querySet, mi *modelInfo, cond *Condition, container interface{}, tz *time.Location, cols []string) (int64, error) {
val := reflect.ValueOf(container)
ind := reflect.Indirect(val)
errTyp := true
one := true
isPtr := true
if val.Kind() == reflect.Ptr {
fn := ""
if ind.Kind() == reflect.Slice {
one = false
typ := ind.Type().Elem()
switch typ.Kind() {
case reflect.Ptr:
fn = getFullName(typ.Elem())
case reflect.Struct:
isPtr = false
fn = getFullName(typ)
}
} else {
fn = getFullName(ind.Type())
}
errTyp = fn != mi.fullName
}
if errTyp {
if one {
panic(fmt.Errorf("wrong object type `%s` for rows scan, need *%s", val.Type(), mi.fullName))
} else {
panic(fmt.Errorf("wrong object type `%s` for rows scan, need *[]*%s or *[]%s", val.Type(), mi.fullName, mi.fullName))
}
}
rlimit := qs.limit
offset := qs.offset
Q := d.ins.TableQuote()
var tCols []string
if len(cols) > 0 {
hasRel := len(qs.related) > 0 || qs.relDepth > 0
tCols = make([]string, 0, len(cols))
var maps map[string]bool
if hasRel {
maps = make(map[string]bool)
}
for _, col := range cols {
if fi, ok := mi.fields.GetByAny(col); ok {
tCols = append(tCols, fi.column)
if hasRel {
maps[fi.column] = true
}
} else {
panic(fmt.Errorf("wrong field/column name `%s`", col))
}
}
if hasRel {
for _, fi := range mi.fields.fieldsDB {
if fi.fieldType&IsRelField > 0 {
if maps[fi.column] == false {
tCols = append(tCols, fi.column)
}
}
}
}
} else {
tCols = mi.fields.dbcols
}
colsNum := len(tCols)
sep := fmt.Sprintf("%s, T0.%s", Q, Q)
sels := fmt.Sprintf("T0.%s%s%s", Q, strings.Join(tCols, sep), Q)
tables := newDbTables(mi, d.ins)
tables.parseRelated(qs.related, qs.relDepth)
where, args := tables.getCondSql(cond, false, tz)
orderBy := tables.getOrderSql(qs.orders)
limit := tables.getLimitSql(mi, offset, rlimit)
join := tables.getJoinSql()
for _, tbl := range tables.tables {
if tbl.sel {
colsNum += len(tbl.mi.fields.dbcols)
sep := fmt.Sprintf("%s, %s.%s", Q, tbl.index, Q)
sels += fmt.Sprintf(", %s.%s%s%s", tbl.index, Q, strings.Join(tbl.mi.fields.dbcols, sep), Q)
}
}
query := fmt.Sprintf("SELECT %s FROM %s%s%s T0 %s%s%s%s", sels, Q, mi.table, Q, join, where, orderBy, limit)
d.ins.ReplaceMarks(&query)
var rs *sql.Rows
if r, err := q.Query(query, args...); err != nil {
return 0, err
} else {
rs = r
}
refs := make([]interface{}, colsNum)
for i, _ := range refs {
var ref interface{}
refs[i] = &ref
}
defer rs.Close()
slice := ind
var cnt int64
for rs.Next() {
if one && cnt == 0 || one == false {
if err := rs.Scan(refs...); err != nil {
return 0, err
}
elm := reflect.New(mi.addrField.Elem().Type())
mind := reflect.Indirect(elm)
cacheV := make(map[string]*reflect.Value)
cacheM := make(map[string]*modelInfo)
trefs := refs
d.setColsValues(mi, &mind, tCols, refs[:len(tCols)], tz)
trefs = refs[len(tCols):]
for _, tbl := range tables.tables {
// loop selected tables
if tbl.sel {
last := mind
names := ""
mmi := mi
// loop cascade models
for _, name := range tbl.names {
names += name
if val, ok := cacheV[names]; ok {
last = *val
mmi = cacheM[names]
} else {
fi := mmi.fields.GetByName(name)
lastm := mmi
mmi = fi.relModelInfo
field := last
if last.Kind() != reflect.Invalid {
field = reflect.Indirect(last.Field(fi.fieldIndex))
if field.IsValid() {
d.setColsValues(mmi, &field, mmi.fields.dbcols, trefs[:len(mmi.fields.dbcols)], tz)
for _, fi := range mmi.fields.fieldsReverse {
if fi.inModel && fi.reverseFieldInfo.mi == lastm {
if fi.reverseFieldInfo != nil {
f := field.Field(fi.fieldIndex)
if f.Kind() == reflect.Ptr {
f.Set(last.Addr())
}
}
}
}
last = field
}
}
cacheV[names] = &field
cacheM[names] = mmi
}
}
trefs = trefs[len(mmi.fields.dbcols):]
}
}
if one {
ind.Set(mind)
} else {
if cnt == 0 {
// you can use a empty & caped container list
// orm will not replace it
if ind.Len() != 0 {
// if container is not empty
// create a new one
slice = reflect.New(ind.Type()).Elem()
}
}
if isPtr {
slice = reflect.Append(slice, mind.Addr())
} else {
slice = reflect.Append(slice, mind)
}
}
}
cnt++
}
if one == false {
if cnt > 0 {
ind.Set(slice)
} else {
// when a result is empty and container is nil
// to set a empty container
if ind.IsNil() {
ind.Set(reflect.MakeSlice(ind.Type(), 0, 0))
}
}
}
return cnt, nil
}
// excute count sql and return count result int64.
func (d *dbBase) Count(q dbQuerier, qs *querySet, mi *modelInfo, cond *Condition, tz *time.Location) (cnt int64, err error) {
tables := newDbTables(mi, d.ins)
tables.parseRelated(qs.related, qs.relDepth)
where, args := tables.getCondSql(cond, false, tz)
tables.getOrderSql(qs.orders)
join := tables.getJoinSql()
Q := d.ins.TableQuote()
query := fmt.Sprintf("SELECT COUNT(*) FROM %s%s%s T0 %s%s", Q, mi.table, Q, join, where)
d.ins.ReplaceMarks(&query)
row := q.QueryRow(query, args...)
err = row.Scan(&cnt)
return
}
// generate sql with replacing operator string placeholders and replaced values.
func (d *dbBase) GenerateOperatorSql(mi *modelInfo, fi *fieldInfo, operator string, args []interface{}, tz *time.Location) (string, []interface{}) {
sql := ""
params := getFlatParams(fi, args, tz)
if len(params) == 0 {
panic(fmt.Errorf("operator `%s` need at least one args", operator))
}
arg := params[0]
switch operator {
case "in":
marks := make([]string, len(params))
for i, _ := range marks {
marks[i] = "?"
}
sql = fmt.Sprintf("IN (%s)", strings.Join(marks, ", "))
case "between":
if len(params) != 2 {
panic(fmt.Errorf("operator `%s` need 2 args not %d", operator, len(params)))
}
sql = "BETWEEN ? AND ?"
default:
if len(params) > 1 {
panic(fmt.Errorf("operator `%s` need 1 args not %d", operator, len(params)))
}
sql = d.ins.OperatorSql(operator)
switch operator {
case "exact":
if arg == nil {
params[0] = "IS NULL"
}
case "iexact", "contains", "icontains", "startswith", "endswith", "istartswith", "iendswith":
param := strings.Replace(ToStr(arg), `%`, `\%`, -1)
switch operator {
case "iexact":
case "contains", "icontains":
param = fmt.Sprintf("%%%s%%", param)
case "startswith", "istartswith":
param = fmt.Sprintf("%s%%", param)
case "endswith", "iendswith":
param = fmt.Sprintf("%%%s", param)
}
params[0] = param
case "isnull":
if b, ok := arg.(bool); ok {
if b {