myql操作
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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()
}