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fields_map.go
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// sqlmapper is a light mapper
// between golang struct and table rows in db
// @author arthas29
// https://github.com/arthas29/sqlmapper
package sqlmapper
import (
"context"
"database/sql"
"errors"
"reflect"
)
// Field db field
// describe struct mapping in DB like:
// type DemoRow struct {
// FieldKey string `sql:"field_key"`
// FieldOne string `sql:"field_one"`
// FieldTwo bool `sql:"field_two"`
// FieldThr int64 `sql:"field_thr"`
// FieldFou float64 `sql:"field_fou"`
// }
//
type Field struct {
Name string
Tag string
Type string
Addr interface{}
IntSave sql.NullInt64
StringSave sql.NullString
FloatSave sql.NullFloat64
BoolSave sql.NullBool
}
// FieldsMap hold Field
type FieldsMap interface {
// GetFields Fields
GetFields() []Field
// GetFieldNamesInDB get Names in db from Fields
GetFieldNamesInDB() []string
// GetFieldValues get Values in Object(struct)
GetFieldValues() []interface{}
// GetFieldValue get Value in Object(struct)
GetFieldValue(idx int) interface{}
// GetFieldSaveAddrs get Pointers of Values in Object(struct)
GetFieldSaveAddrs() []interface{}
// GetFieldSaveAddr get Pointer of Value in Object(struct)
GetFieldSaveAddr(idx int) interface{}
// MapBackToObject mapping back to the original object
MapBackToObject() interface{}
////////////////////////////////////////////////////////////////
// generate SQL string
// SQLFieldsStr generate sqlstr in db from Fields
SQLFieldsStr() string
// SQLFieldsStrForSet generate sqlstr in db from Fields for set
SQLFieldsStrForSet() string
////////////////////////////////////////////////////////////////
// generate statement
// PrepareStmt prepare statement
// Must Close after Stmt used
PrepareStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
sqlstr string) (*sql.Stmt, error)
// SQLSelectStmt generate statement for SELECT
SQLSelectStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error)
// SQLInsertStmt generate statement for INSERT
SQLInsertStmt(ctx context.Context, tx *sql.Tx, db *sql.DB) (*sql.Stmt, error)
// SQLUpdateStmt generate statement for UPDATE
SQLUpdateStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error)
// SQLDeleteStmt generate statement for DELETE
SQLDeleteStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error)
////////////////////////////////////////////////////////////////
// exec sql
// SQLLockByPriKey by primary key (field[0])
SQLLockByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) (interface{}, error)
// SQLSelectByPriKey by primary key (field[0])
SQLSelectByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) (interface{}, error)
// SQLSelectRowsByFieldNameInDB by field name in DB
SQLSelectRowsByFieldNameInDB(ctx context.Context, tx *sql.Tx,
db *sql.DB, nameInDB string) ([]interface{}, error)
// SQLSelectAllRows
SQLSelectAllRows(ctx context.Context, tx *sql.Tx,
db *sql.DB) ([]interface{}, error)
// SQLInsert
SQLInsert(ctx context.Context, tx *sql.Tx, db *sql.DB) error
// SQLUpdateByPriKey by primary key (field[0])
SQLUpdateByPriKey(ctx context.Context, tx *sql.Tx, db *sql.DB) error
// SQLDeleteByPriKey by primary key (field[0])
SQLDeleteByPriKey(ctx context.Context, tx *sql.Tx, db *sql.DB) error
}
////////////////////////////////////////////////////////////////
// NewFieldsMap new Fields
func NewFieldsMap(table string, objptr interface{}) (FieldsMap, error) {
elem := reflect.ValueOf(objptr).Elem()
reftype := elem.Type()
var fields []Field
for i, flen := 0, reftype.NumField(); i < flen; i++ {
var field Field
field.Type = reftype.Field(i).Type.String()
if field.Type != "int64" && field.Type != "string" &&
field.Type != "float64" && field.Type != "bool" {
return nil, errors.New("Unsupported Type: " + field.Type)
}
field.Name = reftype.Field(i).Name
field.Tag = reftype.Field(i).Tag.Get("sql")
field.Addr = elem.Field(i).Addr().Interface()
fields = append(fields, field)
}
return &_FieldsMap{
objptr: objptr,
reftype: reftype,
fields: fields,
table: table,
}, nil
}
////////////////////////////////////////////////////////////////
var _ FieldsMap = &_FieldsMap{}
type _FieldsMap struct {
objptr interface{}
reftype reflect.Type
fields []Field
table string
}
// GetFields get Fields for an Object(struct)
func (fds *_FieldsMap) GetFields() []Field {
return fds.fields
}
// GetFieldNamesInDB get Names in db from Fields
// example:
// type DemoRow struct {
// FieldKey string `sql:"field_key"`
// FieldOne string `sql:"field_one"`
// FieldTwo bool `sql:"field_two"`
// FieldThr int64 `sql:"field_thr"`
// FieldFou float64 `sql:"field_fou"`
// }
//
// return ["field_key", "field_one", "field_two","field_thr","field_fou"]
//
func (fds *_FieldsMap) GetFieldNamesInDB() []string {
var tags []string
for i, flen := 0, len(fds.fields); i < flen; i++ {
tags = append(tags, fds.fields[i].Tag)
}
return tags
}
// GetFieldValues get Values in Object(struct)
func (fds *_FieldsMap) GetFieldValues() []interface{} {
var values []interface{}
for i, flen := 0, len(fds.fields); i < flen; i++ {
values = append(values, fds.GetFieldValue(i))
}
return values
}
// GetFieldValue get Values in Object(struct)
func (fds *_FieldsMap) GetFieldValue(idx int) interface{} {
switch fds.fields[idx].Type {
case "int64":
return *fds.fields[idx].Addr.(*int64)
case "string":
return *fds.fields[idx].Addr.(*string)
case "float64":
return *fds.fields[idx].Addr.(*float64)
case "bool":
return *fds.fields[idx].Addr.(*bool)
default:
}
return nil
}
// GetFieldSaveAddrs get Pointers of Values in Object(struct)
func (fds *_FieldsMap) GetFieldSaveAddrs() []interface{} {
var addrs []interface{}
for i, flen := 0, len(fds.fields); i < flen; i++ {
addrs = append(addrs, fds.GetFieldSaveAddr(i))
}
return addrs
}
// GetFieldSaveAddr get Pointers of Values in Object(struct)
func (fds *_FieldsMap) GetFieldSaveAddr(idx int) interface{} {
switch fds.fields[idx].Type {
case "int64":
return &fds.fields[idx].IntSave
case "string":
return &fds.fields[idx].StringSave
case "float64":
return &fds.fields[idx].FloatSave
case "bool":
return &fds.fields[idx].BoolSave
default:
}
return nil
}
// MapBackToObject mapping back to the original object
func (fds *_FieldsMap) MapBackToObject() interface{} {
for i, flen := 0, len(fds.fields); i < flen; i++ {
switch fds.fields[i].Type {
case "int64":
if fds.fields[i].IntSave.Valid {
*fds.fields[i].Addr.(*int64) = fds.fields[i].IntSave.Int64
}
break
case "string":
if fds.fields[i].StringSave.Valid {
*fds.fields[i].Addr.(*string) = fds.fields[i].StringSave.String
}
break
case "float64":
if fds.fields[i].FloatSave.Valid {
*fds.fields[i].Addr.(*float64) = fds.fields[i].FloatSave.Float64
}
break
case "bool":
if fds.fields[i].BoolSave.Valid {
*fds.fields[i].Addr.(*bool) = fds.fields[i].BoolSave.Bool
}
break
default:
}
}
return fds.objptr
}
////////////////////////////////////////////////////////////////
// generate SQL string
// SQLFieldsStr generate sqlstr in db from Fields
// example:" `field0`, `field1`, `field2`, `field3` "
func (fds *_FieldsMap) SQLFieldsStr() string {
var tagsStr string
for i, flen := 0, len(fds.fields); i < flen; i++ {
if len(tagsStr) > 0 {
tagsStr += ", "
}
tagsStr += "`"
tagsStr += fds.fields[i].Tag
tagsStr += "`"
}
if len(tagsStr) > 0 {
tagsStr += " "
tagsStr = " " + tagsStr
}
return tagsStr
}
// SQLFieldsStrForSet generate sqlstr in db from Fields for set
// example:" `field0` = ?, `field1` = ?, `field2` = ?, `field3` = ? "
func (fds *_FieldsMap) SQLFieldsStrForSet() string {
var tagsStr string
for i, flen := 0, len(fds.fields); i < flen; i++ {
if len(tagsStr) > 0 {
tagsStr += ", "
}
tagsStr += "`"
tagsStr += fds.fields[i].Tag
tagsStr += "`"
tagsStr += " = ?"
}
if len(tagsStr) > 0 {
tagsStr += " "
tagsStr = " " + tagsStr
}
return tagsStr
}
////////////////////////////////////////////////////////////////
// generate statement
// PrepareStmt prepare statement
func (fds *_FieldsMap) PrepareStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
sqlstr string) (*sql.Stmt, error) {
if tx != nil {
return tx.PrepareContext(ctx, sqlstr)
}
if db != nil {
return db.PrepareContext(ctx, sqlstr)
}
return nil, errors.New("tx & db both nil")
}
// SQLSelectStmt generate statement for SELECT
func (fds *_FieldsMap) SQLSelectStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error) {
sqlstr := "SELECT " + fds.SQLFieldsStr() +
" FROM `" + fds.table + "` " + extStr
return fds.PrepareStmt(ctx, tx, db, sqlstr)
}
// SQLInsertStmt generate statement for INSERT
func (fds *_FieldsMap) SQLInsertStmt(ctx context.Context, tx *sql.Tx, db *sql.DB) (*sql.Stmt, error) {
var vs string
for i, flen := 0, len(fds.fields); i < flen; i++ {
if len(vs) > 0 {
vs += ", "
}
vs += "?"
}
sqlstr := "INSERT INTO `" + fds.table + "` (" + fds.SQLFieldsStr() + ") " +
"VALUES (" + vs + ")"
return fds.PrepareStmt(ctx, tx, db, sqlstr)
}
// SQLUpdateStmt generate statement for UPDATE
func (fds *_FieldsMap) SQLUpdateStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error) {
sqlstr := "UPDATE `" + fds.table + "` SET " + fds.SQLFieldsStrForSet() + extStr
return fds.PrepareStmt(ctx, tx, db, sqlstr)
}
// SQLDeleteStmt generate statement for DELETE
func (fds *_FieldsMap) SQLDeleteStmt(ctx context.Context, tx *sql.Tx, db *sql.DB,
extStr string) (*sql.Stmt, error) {
sqlstr := "DELETE FROM `" + fds.table + "` " + extStr
return fds.PrepareStmt(ctx, tx, db, sqlstr)
}
////////////////////////////////////////////////////////////////
// exec sql
// SQLLockByPriKey by primary key (field[0])
func (fds *_FieldsMap) SQLLockByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) (interface{}, error) {
extStr := " where `" + fds.fields[0].Tag + "` = ? for update "
stmt, err := fds.SQLSelectStmt(ctx, tx, db, extStr)
if err != nil {
return nil, err
}
defer stmt.Close() // must close stmt after stmt used
r := stmt.QueryRowContext(ctx, fds.GetFieldValue(0))
if r == nil {
return nil, errors.New("row is nil")
}
err = r.Scan(fds.GetFieldSaveAddrs()...)
if err != nil {
return nil, err
}
return fds.MapBackToObject(), nil
}
// SQLSelectByPriKey by primary key (field[0])
func (fds *_FieldsMap) SQLSelectByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) (interface{}, error) {
extStr := " where `" + fds.fields[0].Tag + "` = ? "
stmt, err := fds.SQLSelectStmt(ctx, tx, db, extStr)
if err != nil {
return nil, err
}
defer stmt.Close() // must close stmt after stmt used
r := stmt.QueryRowContext(ctx, fds.GetFieldValue(0))
if r == nil {
return nil, errors.New("row is nil")
}
err = r.Scan(fds.GetFieldSaveAddrs()...)
if err != nil {
return nil, err
}
return fds.MapBackToObject(), nil
}
// SQLSelectRowsByFieldNameInDB by field name in DB
func (fds *_FieldsMap) SQLSelectRowsByFieldNameInDB(ctx context.Context, tx *sql.Tx,
db *sql.DB, nameInDB string) ([]interface{}, error) {
idx := -1
for i, flen := 0, len(fds.fields); i < flen; i++ {
if fds.fields[i].Tag == nameInDB {
idx = i
break
}
}
if idx < 0 {
return nil, errors.New("no field match `sql` tag:" + nameInDB)
}
extStr := " where `" + fds.fields[idx].Tag + "` = ? "
stmt, err := fds.SQLSelectStmt(ctx, tx, db, extStr)
if err != nil {
return nil, err
}
defer stmt.Close() // must close stmt after stmt used
rs, err := stmt.QueryContext(ctx, fds.GetFieldValue(idx))
if err != nil {
return nil, err
}
defer rs.Close() // should close Rows after used
var objs []interface{}
for rs.Next() {
obj := reflect.New(fds.reftype).Interface()
fieldsMap, err := NewFieldsMap(fds.table, obj)
if err != nil {
return nil, err
}
err = rs.Scan(fieldsMap.GetFieldSaveAddrs()...)
if err != nil {
return nil, err
}
fieldsMap.MapBackToObject()
objs = append(objs, obj)
}
return objs, nil
}
// SQLSelectAllRows
func (fds *_FieldsMap) SQLSelectAllRows(ctx context.Context, tx *sql.Tx,
db *sql.DB) ([]interface{}, error) {
stmt, err := fds.SQLSelectStmt(ctx, tx, db, "")
if err != nil {
return nil, err
}
defer stmt.Close() // must close stmt after stmt used
rs, err := stmt.QueryContext(ctx)
if err != nil {
return nil, err
}
defer rs.Close() // should close Rows after used
var objs []interface{}
for rs.Next() {
obj := reflect.New(fds.reftype).Interface()
fieldsMap, err := NewFieldsMap(fds.table, obj)
if err != nil {
return nil, err
}
err = rs.Scan(fieldsMap.GetFieldSaveAddrs()...)
if err != nil {
return nil, err
}
fieldsMap.MapBackToObject()
objs = append(objs, obj)
}
return objs, nil
}
// SQLInsert
func (fds *_FieldsMap) SQLInsert(ctx context.Context, tx *sql.Tx,
db *sql.DB) error {
stmt, err := fds.SQLInsertStmt(ctx, tx, db)
if err != nil {
return err
}
defer stmt.Close() // must close stmt after stmt used
_, err = stmt.ExecContext(ctx, fds.GetFieldValues()...)
if err != nil {
return err
}
return nil
}
// SQLUpdateByPriKey by primary key (field[0])
func (fds *_FieldsMap) SQLUpdateByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) error {
extStr := " where `" + fds.fields[0].Tag + "` = ? "
stmt, err := fds.SQLUpdateStmt(ctx, tx, db, extStr)
if err != nil {
return err
}
defer stmt.Close() // must close stmt after stmt used
values := fds.GetFieldValues()
values = append(values, fds.GetFieldValue(0))
_, err = stmt.ExecContext(ctx, values...)
if err != nil {
return err
}
return nil
}
// SQLDeleteByPriKey by primary key (field[0])
func (fds *_FieldsMap) SQLDeleteByPriKey(ctx context.Context, tx *sql.Tx,
db *sql.DB) error {
extStr := " where `" + fds.fields[0].Tag + "` = ? "
stmt, err := fds.SQLDeleteStmt(ctx, tx, db, extStr)
if err != nil {
return err
}
defer stmt.Close() // must close stmt after stmt used
_, err = stmt.ExecContext(ctx, fds.GetFieldValue(0))
if err != nil {
return err
}
return nil
}