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adapter.go
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adapter.go
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package adapter
import (
"context"
"database/sql"
"database/sql/driver"
"encoding/json"
"errors"
"fmt"
"reflect"
q "github.com/core-go/sql"
)
type Adapter[T any, K any] struct {
*Writer[*T]
Map map[string]int
Fields string
IdMap bool
}
func NewAdapter[T any, K any](db *sql.DB, tableName string, opts ...func(int) string) (*Adapter[T, K], error) {
return NewSqlAdapterWithVersionAndArray[T, K](db, tableName, "", nil, opts...)
}
func NewAdapterWithVersion[T any, K any](db *sql.DB, tableName string, versionField string, opts ...func(int) string) (*Adapter[T, K], error) {
return NewSqlAdapterWithVersionAndArray[T, K](db, tableName, versionField, nil, opts...)
}
func NewSqlAdapterWithVersionAndArray[T any, K any](db *sql.DB, tableName string, versionField string, toArray func(interface{}) interface {
driver.Valuer
sql.Scanner
}, opts ...func(int) string) (*Adapter[T, K], error) {
adapter, err := NewSqlWriterWithVersionAndArray[*T](db, tableName, versionField, toArray, opts...)
if err != nil {
return nil, err
}
var t T
modelType := reflect.TypeOf(t)
if modelType.Kind() != reflect.Struct {
return nil, errors.New("T must be a struct")
}
var k K
kType := reflect.TypeOf(k)
idMap := false
if len(adapter.Keys) > 1 {
if kType.Kind() == reflect.Map {
idMap = true
} else if kType.Kind() != reflect.Struct {
return nil, errors.New("for composite keys, K must be a struct or a map")
}
}
fieldsIndex, err := q.GetColumnIndexes(modelType)
if err != nil {
return nil, err
}
fields := q.BuildFieldsBySchema(adapter.Schema)
return &Adapter[T, K]{adapter, fieldsIndex, fields, idMap}, nil
}
func (a *Adapter[T, K]) All(ctx context.Context) ([]T, error) {
var objs []T
query := fmt.Sprintf("select %s from %s", a.Fields, a.Table)
tx := q.GetExec(ctx, a.DB, a.TxKey)
err := q.Query(ctx, tx, a.Map, &objs, query)
return objs, err
}
func toMap(obj interface{}) (map[string]interface{}, error) {
b, err := json.Marshal(obj)
if err != nil {
return nil, err
}
im := make(map[string]interface{})
er2 := json.Unmarshal(b, &im)
return im, er2
}
func (a *Adapter[T, K]) getId(k K) (interface{}, error) {
if len(a.Keys) >= 2 && !a.IdMap {
ri, err := toMap(k)
return ri, err
} else {
return k, nil
}
}
func (a *Adapter[T, K]) Load(ctx context.Context, id K) (*T, error) {
ip, er0 := a.getId(id)
if er0 != nil {
return nil, er0
}
var objs []T
query := fmt.Sprintf("select %s from %s ", a.Fields, a.Table)
query1, args := q.BuildFindByIdWithDB(a.DB, query, ip, a.JsonColumnMap, a.Keys, a.BuildParam)
tx := q.GetExec(ctx, a.DB, a.TxKey)
err := q.Query(ctx, tx, a.Map, &objs, query1, args...)
if err != nil {
return nil, err
}
if len(objs) > 0 {
return &objs[0], nil
}
return nil, nil
}
func (a *Adapter[T, K]) Exist(ctx context.Context, id K) (bool, error) {
ip, er0 := a.getId(id)
if er0 != nil {
return false, er0
}
query := fmt.Sprintf("select %s from %s ", a.Schema.SColumns[0], a.Table)
query1, args := q.BuildFindByIdWithDB(a.DB, query, ip, a.JsonColumnMap, a.Keys, a.BuildParam)
tx := q.GetExec(ctx, a.DB, a.TxKey)
rows, err := tx.QueryContext(ctx, query1, args...)
if err != nil {
return false, err
}
defer rows.Close()
for rows.Next() {
return true, nil
}
return false, nil
}
func (a *Adapter[T, K]) Delete(ctx context.Context, id K) (int64, error) {
ip, er0 := a.getId(id)
if er0 != nil {
return -1, er0
}
query := fmt.Sprintf("delete from %s ", a.Table)
query1, args := q.BuildFindByIdWithDB(a.DB, query, ip, a.JsonColumnMap, a.Keys, a.BuildParam)
tx := q.GetExec(ctx, a.DB, a.TxKey)
res, err := tx.ExecContext(ctx, query1, args...)
if err != nil {
return -1, err
}
return res.RowsAffected()
}