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json.go
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json.go
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package db
import (
"database/sql"
"fmt"
"reflect"
"strings"
"time"
_ "github.com/go-sql-driver/mysql"
log "github.com/sirupsen/logrus"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
var (
DB *sql.DB
checked = make(map[string]bool)
marshaler = protojson.MarshalOptions{EmitUnpopulated: true}
)
func Open(dsn string) {
var err error
for i := 1; i <= 5; i++ {
DB, err = sql.Open("mysql", dsn)
if err != nil {
log.Errorln("Connect failed: ", dsn, err, i)
time.Sleep(time.Second * 5)
continue
} else {
break
}
}
log.Debugln("DB init completely: ", dsn)
DB.SetMaxIdleConns(0)
}
func checkTable(table string) (sql.Result, error) {
if checked[table] {
return nil, nil
}
result, err := DB.Exec(fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (data JSON, id VARCHAR(64) GENERATED ALWAYS AS (data->'$.id') VIRTUAL, INDEX idx (id))", table))
if err == nil {
checked[table] = true
}
return result, err
}
func Insert(table string, obj proto.Message) error {
tx, err := DB.Begin()
if err != nil {
return err
}
if _, err := InsertTx(tx, table, obj); err != nil {
tx.Rollback()
return err
}
if err := tx.Commit(); err != nil {
tx.Rollback()
return err
}
return nil
}
func InsertTx(tx *sql.Tx, table string, obj proto.Message) (sql.Result, error) {
checkTable(table)
jsonv, err := marshaler.Marshal(obj)
if err != nil {
return nil, err
}
return tx.Exec("INSERT INTO "+table+"(data) VALUES (CAST(? AS JSON))", jsonv)
}
func InsertIfNotExist(table string, id interface{}, obj proto.Message) error {
if GetById(table, id, proto.Clone(obj)) == sql.ErrNoRows {
return Insert(table, obj)
}
return nil
}
// Update||Insert
func Upsert(table string, id interface{}, obj proto.Message) error {
if err := GetById(table, id, proto.Clone(obj)); err == sql.ErrNoRows {
return Insert(table, obj)
}
return Update(table, id, obj)
}
func GetById(table string, id interface{}, obj proto.Message) error {
return Get(table, map[string]interface{}{"$.id": id}, obj)
}
// https://dev.mysql.com/doc/refman/5.7/en/json.html#json-paths
func Get(table string, kvs map[string]interface{}, obj proto.Message) error {
checkTable(table)
var (
keys []string
values []interface{}
)
for k, v := range kvs {
if k == "$.id" { // use index
keys = append(keys, "id=?")
v = "\"" + fmt.Sprint(v) + "\""
} else {
keys = append(keys, "data->'"+k+"'=?")
}
values = append(values, v)
}
query := "SELECT data FROM " + table + " WHERE " + strings.Join(keys, " AND ")
return DB.QueryRow(query, values...).Scan(obj)
}
func List(table string, result interface{}, clause ...string) error {
checkTable(table)
resultv := reflect.ValueOf(result)
if resultv.Kind() != reflect.Ptr || resultv.Elem().Kind() != reflect.Slice {
return fmt.Errorf("result argument must be a slice address")
}
slicev := resultv.Elem()
query := fmt.Sprintf("SELECT data FROM %s %s", table, strings.Join(clause, " "))
log.Debugln(query)
rows, err := DB.Query(query)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
elemp := reflect.New(slicev.Type().Elem().Elem())
var data []byte
if err := rows.Scan(&data); err != nil {
return err
}
protojson.Unmarshal(data, elemp.Interface().(proto.Message))
slicev = reflect.Append(slicev, elemp)
}
reflect.ValueOf(result).Elem().Set(slicev)
return nil
}
func Update(table string, id interface{}, newObj proto.Message) error {
tx, err := DB.Begin()
if err != nil {
return err
}
if _, err := UpdateTx(tx, table, id, newObj); err != nil {
tx.Rollback()
return err
}
if err := tx.Commit(); err != nil {
tx.Rollback()
return err
}
return nil
}
func UpdateTx(tx *sql.Tx, table string, id interface{}, newObj proto.Message) (sql.Result, error) {
jsonv, err := marshaler.Marshal(newObj)
if err != nil {
return nil, err
}
return tx.Exec("UPDATE "+table+" SET data=CAST(? AS JSON) WHERE data->'$.id'=?", jsonv, id)
}
func UpdateKVS(table string, id interface{}, kvs map[string]interface{}) (sql.Result, error) {
var (
keys []string
values []interface{}
)
for k, v := range kvs { // key should be [json-path], e.g:$.id
keys = append(keys, ",'"+k+"',?")
values = append(values, v)
}
sql := "UPDATE " + table + " SET data=" + "JSON_SET(data" + strings.Join(keys, "") + ") WHERE data->'$.id'= ?"
return DB.Exec(sql, append(values, id)...)
}
func Delete(table string, id interface{}) error {
tx, err := DB.Begin()
if err != nil {
return err
}
if _, err := DeleteTx(tx, table, id); err != nil {
tx.Rollback()
return err
}
if err := tx.Commit(); err != nil {
tx.Rollback()
return err
}
return nil
}
func DeleteTx(tx *sql.Tx, table string, id interface{}) (sql.Result, error) {
return tx.Exec("DELETE FROM "+table+" WHERE data->'$.id' = ?", id)
}