package tencentdb /** * 事务操作 */ import ( "database/sql" "errors" "log" "strconv" "strings" ) type TxQuery struct { dbname string table string alias string title string where []string where_or []string join [][]string //[["tablea as a","a.id=b.id","left"]] data []string value []interface{} orderby string page int page_size int stmt *sql.Stmt conn *sql.DB tx *sql.Tx debug bool } func NewTxQuery(t ...string) *TxQuery { var conn_type *sql.DB = DB tx, err := conn_type.Begin() if err != nil { log.Println("start tx begin error", err) } return &TxQuery{ conn: conn_type, tx: tx, } } func (this *TxQuery) Conn(conn *sql.DB) *TxQuery { this.conn = conn return this } func (this *TxQuery) Db(dbname string) *TxQuery { this.dbname = dbname return this } func (this *TxQuery) Table(tablename string) *TxQuery { this.table = tablename return this } func (this *TxQuery) Alias(tablename string) *TxQuery { this.alias = tablename return this } func (this *TxQuery) Title(title string) *TxQuery { this.title = title return this } func (this *TxQuery) Page(page int) *TxQuery { this.page = page return this } func (this *TxQuery) PageSize(page_num int) *TxQuery { this.page_size = page_num return this } func (this *TxQuery) Orderby(orderby string) *TxQuery { this.orderby = orderby return this } func (this *TxQuery) Where(where string) *TxQuery { this.where = append(this.where, where) return this } func (this *TxQuery) Wheres(wheres []string) *TxQuery { if len(wheres) > 0 { this.where = append(this.where, wheres...) } return this } func (this *TxQuery) WhereOr(where string) *TxQuery { this.where_or = append(this.where_or, where) return this } func (this *TxQuery) Value(value interface{}) *TxQuery { this.value = append(this.value, value) return this } func (this *TxQuery) Values(values []interface{}) *TxQuery { this.value = append(this.value, values...) return this } func (this *TxQuery) Join(join []string) *TxQuery { this.join = append(this.join, join) return this } func (this *TxQuery) Data(data string) *TxQuery { this.data = append(this.data, data) return this } func (this *TxQuery) Datas(datas []string) *TxQuery { this.data = append(this.data, datas...) return this } func (this *TxQuery) Debug(debug bool) *TxQuery { this.debug = debug return this } /* * 清理上次查询 */ func (this *TxQuery) Clean() *TxQuery { this.title = "" this.where = this.where[0:0] this.where_or = this.where_or[0:0] this.join = this.join[0:0] this.data = this.data[0:0] this.value = this.value[0:0] this.orderby = "" this.page = 0 this.page_size = 0 return this } // 拼查询sql func (this *TxQuery) QueryStmt() error { if this.dbname == "" && this.table == "" { return errors.New("参数错误,没有数据表") } table := getTableName(this.dbname, this.table) var sql, title string if this.title != "" { title = this.title } else { title = "*" } sql = StringJoin("select ", title) if this.alias != "" { table = StringJoin(table, " as ", this.alias) } sql = StringJoin(sql, " from ", table) if len(this.join) > 0 { for _, joinitem := range this.join { if len(joinitem) < 2 { continue } if len(joinitem) == 3 { sql = StringJoin(sql, " ", joinitem[2], " join ", getTableName(this.dbname, joinitem[0]), " on ", joinitem[1]) } else { //默认左连接 sql = StringJoin(sql, " left join ", getTableName(this.dbname, joinitem[0]), " on ", joinitem[1]) } } } if len(this.where) > 0 || len(this.where_or) > 0 { sql = StringJoin(sql, " where ") } if len(this.where) > 0 { sql = StringJoin(sql, " (", strings.Join(this.where, " and "), " ) ") } if len(this.where_or) > 0 { if len(this.where) > 0 { sql = StringJoin(sql, " or ", strings.Join(this.where_or, " or ")) } else { sql = StringJoin(sql, strings.Join(this.where_or, " or ")) } } if this.orderby != "" { sql = StringJoin(sql, " order by ", this.orderby) } if this.page > 0 || this.page_size > 0 { if this.page < 1 { this.page = 1 } if this.page_size < 1 { this.page_size = 10 } from := strconv.Itoa((this.page - 1) * this.page_size) offset := strconv.Itoa(this.page_size) if from != "" && offset != "" { sql = StringJoin(sql, " limit ", from, " , ", offset) } } if this.debug { log.Println("query sql:", sql, this.value) } condition_len := 0 //所有条件数 for _, ch2 := range sql { if string(ch2) == "?" { condition_len++ } } if condition_len != len(this.value) { return errors.New("参数错误,条件值错误") } stmt, err = this.tx.Prepare(sql + " FOR UPDATE") if err != nil { return err } this.stmt = stmt return nil } // 拼更新sql func (this *TxQuery) UpdateStmt() error { if this.dbname == "" && this.table == "" { return errors.New("参数错误,没有数据表") } if len(this.where) < 1 { return errors.New("参数错误,缺少条件") } dbName := getTableName(this.dbname, this.table) var sql string sql = StringJoin("update ", dbName, " set ", strings.Join(this.data, " , ")) sql = StringJoin(sql, " where ", strings.Join(this.where, " and ")) if this.debug { log.Println("update sql:", sql, this.value) } condition_len := 0 //所有条件数 for _, ch2 := range sql { if string(ch2) == "?" { condition_len++ } } if condition_len != len(this.value) { return errors.New("参数错误,条件值错误") } stmt, err = this.tx.Prepare(sql) if err != nil { return err } this.stmt = stmt return nil } // 拼插入sql func (this *TxQuery) CreateStmt() error { if this.dbname == "" && this.table == "" { return errors.New("参数错误,没有数据表") } dbName := getTableName(this.dbname, this.table) var sql string sql = StringJoin("insert into ", dbName, " set ", strings.Join(this.data, " , ")) if this.debug { log.Println("insert sql:", sql, this.value) } condition_len := 0 //所有条件数 for _, ch2 := range sql { if string(ch2) == "?" { condition_len++ } } if condition_len != len(this.value) { return errors.New("参数错误,条件值错误") } stmt, err = this.tx.Prepare(sql) if err != nil { return err } this.stmt = stmt return nil } // 拼删除sql func (this *TxQuery) DeleteStmt() error { if this.dbname == "" && this.table == "" { return errors.New("参数错误,没有数据表") } if len(this.where) < 1 { return errors.New("参数错误,缺少条件") } dbName := getTableName(this.dbname, this.table) var sql string sql = StringJoin("delete from ", dbName, " where ", strings.Join(this.where, " and ")) if this.page_size > 0 { sql = StringJoin(sql, " limit ", strconv.Itoa(this.page_size)) } if this.debug { log.Println("delete sql:", sql, this.value) } condition_len := 0 //所有条件数 for _, ch2 := range sql { if string(ch2) == "?" { condition_len++ } } if condition_len != len(this.value) { return errors.New("参数错误,条件值错误") } stmt, err = this.tx.Prepare(sql) if err != nil { return err } this.stmt = stmt return nil } /** * 执行查询列表 * return list error */ func (this *TxQuery) Select() ([]map[string]string, error) { err := this.QueryStmt() if err != nil { return []map[string]string{}, err } if this.stmt == nil { return []map[string]string{}, errors.New("缺少必要参数") } return StmtForQueryList(this.stmt, this.value) } /** * 执行查询一条数据 * return row error */ func (this *TxQuery) Find() (map[string]string, error) { this.page = 1 this.page_size = 1 err := this.QueryStmt() if err != nil { return map[string]string{}, err } if this.stmt == nil { return nil, errors.New("缺少必要参数") } return StmtForQueryRow(this.stmt, this.value) } /** * 执行更新 * return is_updated error */ func (this *TxQuery) Update() (int64, error) { err := this.UpdateStmt() if err != nil { return 0, err } return StmtForUpdateExec(this.stmt, this.value) } /** * 执行删除 * return is_delete error */ func (this *TxQuery) Delete() (int64, error) { err := this.DeleteStmt() if err != nil { return 0, err } return StmtForUpdateExec(this.stmt, this.value) } /** * 执行写入 * return is_insert error */ func (this *TxQuery) Create() (int64, error) { err := this.CreateStmt() if err != nil { return 0, err } return StmtForInsertExec(this.stmt, this.value) } /** * 提交 */ func (this *TxQuery) Commit() error { return this.tx.Commit() } /** * 回滚 */ func (this *TxQuery) Rollback() error { return this.tx.Rollback() }