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dbquery
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数据库操作
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dbquery/chain.go

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package dbquery
import (
"database/sql"
"errors"
"log"
"strconv"
"strings"
"git.tetele.net/tgo/helper"
)
var stmt *sql.Stmt
var err error
type Query struct {
dbname string
table string
alias string
title string
where []string
where_or []string
join [][]string //[["tablea as a","a.id=b.id","left"]]
save_data []map[string]interface{} //批量操作的数据[["title":"a","num":1,],["title":"a","num":1,]]
upd_field []string // 批量更新时需要更新的字段，为空时按除id外的字段进行更新
data []string
value []interface{}
orderby string
groupby string
having string
page int
page_size int
stmt *sql.Stmt
conn *sql.DB
debug bool
dbtype string
}
func NewQuery(t ...string) *Query {
var conn_type *sql.DB = DB
var db_type string = "mysql"
if len(t) > 0 {
switch t[0] {
case "mysql":
conn_type = DB
db_type = "mysql"
case "mssql": //sql server
conn_type = MSDB_CONN
db_type = "mssql"
}
}
return &Query{
conn: conn_type,
dbtype: db_type,
}
}
func (this *Query) Conn(conn *sql.DB) *Query {
this.conn = conn
return this
}
func (this *Query) Db(dbname string) *Query {
this.dbname = dbname
return this
}
func (this *Query) Table(tablename string) *Query {
this.table = tablename
return this
}
func (this *Query) Alias(tablename string) *Query {
this.alias = tablename
return this
}
func (this *Query) Title(title string) *Query {
this.title = title
return this
}
func (this *Query) Page(page int) *Query {
this.page = page
return this
}
func (this *Query) PageSize(page_num int) *Query {
this.page_size = page_num
return this
}
func (this *Query) Having(having string) *Query {
this.having = having
return this
}
func (this *Query) Orderby(orderby string) *Query {
this.orderby = orderby
return this
}
func (this *Query) Groupby(groupby string) *Query {
this.groupby = groupby
return this
}
func (this *Query) Where(where string) *Query {
this.where = append(this.where, where)
return this
}
func (this *Query) Wheres(wheres []string) *Query {
if len(wheres) > 0 {
this.where = append(this.where, wheres...)
}
return this
}
func (this *Query) WhereOr(where string) *Query {
this.where_or = append(this.where_or, where)
return this
}
func (this *Query) SaveData(value map[string]interface{}) *Query {
this.save_data = append(this.save_data, value)
return this
}
func (this *Query) SaveDatas(value []map[string]interface{}) *Query {
this.save_data = append(this.save_data, value...)
return this
}
func (this *Query) UpdField(value string) *Query {
this.upd_field = append(this.upd_field, value)
return this
}
func (this *Query) UpdFields(value []string) *Query {
this.upd_field = append(this.upd_field, value...)
return this
}
func (this *Query) Value(value interface{}) *Query {
this.value = append(this.value, value)
return this
}
func (this *Query) Values(values []interface{}) *Query {
this.value = append(this.value, values...)
return this
}
func (this *Query) Join(join []string) *Query {
this.join = append(this.join, join)
return this
}
func (this *Query) Data(data string) *Query {
this.data = append(this.data, data)
return this
}
func (this *Query) Datas(datas []string) *Query {
this.data = append(this.data, datas...)
return this
}
func (this *Query) Debug(debug bool) *Query {
this.debug = debug
return this
}
/*
* 清理上次查询
*/
func (this *Query) Clean() *Query {
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.groupby = ""
this.page = 0
this.page_size = 0
this.save_data = this.save_data[0:0]
this.upd_field = this.upd_field[0:0]
this.having = ""
return this
}
//获取表格信息
func (this *Query) GetTableInfo(table string) (map[string]interface{}, error) {
field := []string{
"COLUMN_NAME", //字段名
"COLUMN_DEFAULT", //默认值
"DATA_TYPE", //数据类型
"COLUMN_TYPE", //数据类型+长度
"COLUMN_COMMENT", //备注
"IS_NULLABLE", //是否为空
}
sql := "select `" + strings.Join(field, "`,`") + "` from information_schema.COLUMNS where table_name = ? and table_schema = ?"
if this.conn == nil {
this.conn = DB
}
stmtSql, err := this.conn.Prepare(sql)
if err != nil {
return nil, err
}
list, err := StmtForQueryList(stmtSql, []interface{}{table, this.dbname})
if err != nil {
return nil, err
}
rows := make([]interface{}, 0, len(list))
fieldName := make([]string, 0, len(list))
for _, item := range list {
info := map[string]interface{}{
"name": "",
"column_type": "",
"is_null": true,
"data_type": "",
"comment": "",
"default": "",
}
for _, k := range field {
index := helper.StrFirstToUpper(k)
if v, ok := item[index]; ok {
switch k {
case "COLUMN_NAME":
info["name"] = v
case "COLUMN_DEFAULT":
info["default"] = v
case "DATA_TYPE":
info["data_type"] = v
case "COLUMN_TYPE":
info["column_type"] = helper.ToInt64(v)
case "COLUMN_COMMENT":
info["comment"] = helper.ToInt64(v)
case "IS_NULLABLE":
if v == "NO" {
info["is_null"] = false
}
}
}
}
name := helper.ToStr(info["name"])
if name != "" {
rows = append(rows, info)
fieldName = append(fieldName, name)
}
}
return map[string]interface{}{
"field": fieldName,
"list": rows,
}, nil
}
//构造子查询
func (this *Query) BuildSelectSql() (map[string]interface{}, error) {
if this.dbname == "" && this.table == "" {
return nil, errors.New("参数错误，没有数据表")
}
var table = ""
if strings.Contains(this.table, "select ") {
table = this.table
} else {
table = getTableName(this.dbname, this.table, this.dbtype)
}
// var err error
var sql, title string
if this.title != "" {
title = this.title
} else {
title = "*"
}
sql = helper.StringJoin("/*slave*/ select ", title)
if this.alias != "" {
table = helper.StringJoin(table, " as ", this.alias)
}
sql = helper.StringJoin(sql, " from ", table)
if len(this.join) > 0 {
for _, joinitem := range this.join {
if len(joinitem) < 2 {
continue
}
if len(joinitem) == 3 {
sql = helper.StringJoin(sql, " ", joinitem[2], " join ", getTableName(this.dbname, joinitem[0], this.dbtype), " on ", joinitem[1])
} else { //默认左连接
sql = helper.StringJoin(sql, " left join ", getTableName(this.dbname, joinitem[0], this.dbtype), " on ", joinitem[1])
}
}
}
if len(this.where) > 0 || len(this.where_or) > 0 {
sql = helper.StringJoin(sql, " where ")
}
if len(this.where) > 0 {
sql = helper.StringJoin(sql, " (", strings.Join(this.where, " and "), " ) ")
}
if len(this.where_or) > 0 {
if len(this.where) > 0 {
sql = helper.StringJoin(sql, " or ", strings.Join(this.where_or, " or "))
} else {
sql = helper.StringJoin(sql, strings.Join(this.where_or, " or "))
}
}
if this.groupby != "" {
sql = helper.StringJoin(sql, " group by ", this.groupby)
}
if this.having != "" {
sql = helper.StringJoin(sql, " having ", this.having)
}
if this.orderby != "" {
sql = helper.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 = helper.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 nil, errors.New("参数错误，条件值错误")
}
return map[string]interface{}{
"sql": sql,
"value": this.value,
}, nil
}
// 拼查询sql
func (this *Query) QueryStmt() error {
res := map[string]interface{}{}
res, err = this.BuildSelectSql()
if err != nil {
return err
}
sql := helper.ToStr(res["sql"])
if SLAVER_DB != nil {
this.conn = SLAVER_DB
} else {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
// 拼更新sql
func (this *Query) 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, this.dbtype)
var sql string
sql = helper.StringJoin("update ", dbName, " set ", strings.Join(this.data, " , "))
sql = helper.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")
}
if this.conn == nil {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
// 拼批量存在更新不存在插入sql
func (this *Query) UpdateAllStmt() 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
var dataSql []string //一组用到的占位字符
var valSql []string //占位字符组
var updSql []string //更新字段的sql
var updFieldLen = len(this.upd_field) //需要更新的字段数量，为0时更新除id外添加值
dataLen := len(this.save_data)
if dataLen > 0 {
//批量操作
this.data = this.data[0:0]
this.value = this.value[0:0]
var dataSqlText string //占位字符组
for i := 0; i < dataLen; i++ {
if i == 0 {
//第一组时分配变量空间
fieldLen := len(this.save_data[i])
this.data = make([]string, 0, fieldLen)
dataSql = make([]string, 0, fieldLen)
this.value = make([]interface{}, 0, fieldLen*dataLen)
valSql = make([]string, 0, dataLen)
switch updFieldLen {
case 0:
//预览创建数据的长度
updSql = make([]string, 0, fieldLen)
default:
//按照需要更新字段数长度
updSql = make([]string, 0, updFieldLen)
for _, k := range this.upd_field {
updSql = append(updSql, k+"=values("+k+")") //存储需要更新的字段
}
}
for k := range this.save_data[i] {
this.data = append(this.data, k) //存储添加的字段
dataSql = append(dataSql, "?") //存储需要的占位符
if updFieldLen == 0 && k != "id" {
updSql = append(updSql, k+"=values("+k+")") //存储需要更新的字段
}
}
dataSqlText = strings.Join(dataSql, ",") //组成每组占位字符格式
}
for j := 0; j < len(this.data); j++ {
this.value = append(this.value, this.save_data[i][this.data[j]]) //存储值
}
valSql = append(valSql, "("+dataSqlText+")") //组成占位字符组
}
} else {
//添加一条（原理同上）
fieldLen := len(this.data)
dataSql = make([]string, 0, fieldLen)
valSql = make([]string, 0, 1)
switch updFieldLen {
case 0:
updSql = make([]string, 0, fieldLen)
default:
updSql = make([]string, 0, updFieldLen)
for _, k := range this.upd_field {
updSql = append(updSql, k+"=values("+k+")")
}
}
for i := 0; i < fieldLen; i++ {
dataSql = append(dataSql, "?")
if updFieldLen == 0 && this.data[i] != "id" {
updSql = append(updSql, this.data[i]+"=values("+this.data[i]+")")
}
}
if updFieldLen > 0 {
for _, k := range this.upd_field {
updSql = append(updSql, k+"=values("+k+")")
}
}
valSql = append(valSql, "("+strings.Join(dataSql, " , ")+")")
}
if len(this.data) == 0 {
return errors.New("参数错误，没有字段值")
}
if len(this.value) == 0 {
return errors.New("参数错误，条件值错误")
}
setText := " values "
if len(valSql) > 1 {
setText = " value "
}
sql = helper.StringJoin("insert into ", dbName, " (", strings.Join(this.data, " , "), ")", setText, strings.Join(valSql, ","), " ON DUPLICATE KEY UPDATE ", strings.Join(updSql, " , "))
if this.debug {
log.Println("insert on duplicate key update sql:", sql, this.value)
}
conditionLen := 0 //所有条件数
for _, ch2 := range sql {
if string(ch2) == "?" {
conditionLen++
}
}
if conditionLen != len(this.value) {
return errors.New("参数错误，条件值数量不匹配")
}
if this.conn == nil {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
// 拼批量插入sql
func (this *Query) CreateAllStmt() 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
var dataSql []string //一组用到的占位字符
var valSql []string //占位字符组
dataLen := len(this.save_data)
if dataLen > 0 {
//清空字段和值
this.data = this.data[0:0]
this.value = this.value[0:0]
var dataSqlText string //占位字符组
for i := 0; i < dataLen; i++ {
if i == 0 {
//第一组时分配变量空间
fieldLen := len(this.save_data[i])
this.data = make([]string, 0, fieldLen)
dataSql = make([]string, 0, fieldLen)
this.value = make([]interface{}, 0, fieldLen*dataLen)
valSql = make([]string, 0, dataLen)
for k := range this.save_data[i] {
this.data = append(this.data, k) //存储字段
dataSql = append(dataSql, "?") //存储需要的占位符
}
dataSqlText = strings.Join(dataSql, ",") //组成每组占位字符格式
}
for j := 0; j < len(this.data); j++ {
this.value = append(this.value, this.save_data[i][this.data[j]]) //存储值
}
valSql = append(valSql, "("+dataSqlText+")") //组成占位字符组
}
} else {
//添加一条（原理同上）
fieldLen := len(this.data)
dataSql = make([]string, 0, fieldLen)
for i := 0; i < fieldLen; i++ {
dataSql = append(dataSql, "?")
}
valSql = make([]string, 0, 1)
valSql = append(valSql, "("+strings.Join(dataSql, " , ")+")")
}
if len(this.data) == 0 {
return errors.New("参数错误，字段名错误")
}
if len(this.value) == 0 {
return errors.New("参数错误，条件值错误")
}
//通过sql关键字优化批量操作和单个操作效率
setText := " values "
if len(valSql) > 1 {
setText = " value "
}
sql = helper.StringJoin("insert into ", dbName, " (", strings.Join(this.data, " , "), ")", setText, strings.Join(valSql, ","))
if this.debug {
log.Println("insert sql:", sql, this.value)
}
conditionLen := 0 //所有条件数
for _, ch2 := range sql {
if string(ch2) == "?" {
conditionLen++
}
}
if conditionLen != len(this.value) {
return errors.New("参数错误，条件值数量不匹配")
}
if this.conn == nil {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
// 拼插入sql
func (this *Query) 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, this.dbtype)
var sql string
sql = helper.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")
}
if this.conn == nil {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
// 拼删除sql
func (this *Query) 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, this.dbtype)
var sql string
sql = helper.StringJoin("delete from ", dbName, " where ", strings.Join(this.where, " and "))
if this.page_size > 0 {
sql = helper.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")
}
if this.conn == nil {
this.conn = DB
}
stmt, err = this.conn.Prepare(sql)
if err != nil {
return err
}
this.stmt = stmt
return nil
}
/**
* 执行查询列表
* return list error
*/
func (this *Query) Select() ([]map[string]string, error) {
_, rows, err := FetchRows(this.dbname, this.table, this.alias, this.title, this.join,
this.where, this.where_or, this.value, this.orderby, this.groupby, this.having, this.page, this.page_size, this.debug)
return rows, err
}
/**
* 执行查询多条数据
* return row error
* 2022/01/05
*/
func (this *Query) List() ([]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 *Query) Find() (map[string]string, error) {
_, row, err := GetRow(this.dbname, this.table, this.alias, this.title, this.join,
this.where, this.where_or, this.value, this.orderby, this.groupby, this.having, this.debug)
return row, err
}
/**
* 执行查询一条数据
* return row error
* 2022/01/05
*/
func (this *Query) Get() (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 *Query) Update() (int64, error) {
err := this.UpdateStmt()
if err != nil {
return 0, err
}
return StmtForUpdateExec(this.stmt, this.value)
}
//批量更新
func (this *Query) UpdateAll() (int64, error) {
err := this.UpdateAllStmt()
if err != nil {
return 0, err
}
return StmtForUpdateExec(this.stmt, this.value)
}
/**
* 执行删除
* return is_delete error
*/
func (this *Query) 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 *Query) Create() (int64, error) {
err := this.CreateStmt()
if err != nil {
return 0, err
}
return StmtForInsertExec(this.stmt, this.value)
}
func (this *Query) CreateAll() (int64, error) {
err := this.CreateAllStmt()
if err != nil {
return 0, err
}
return StmtForInsertExec(this.stmt, this.value)
}