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345 lines
6.6 KiB
345 lines
6.6 KiB
package dbquery
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import (
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"database/sql"
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"errors"
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"log"
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// "log"
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"strconv"
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"strings"
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"git.tetele.net/tgo/helper"
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)
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type Query struct {
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dbname string
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table string
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alias string
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title string
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where []string
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where_or []string
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join [][]string //[["tablea as a","a.id=b.id","left"]]
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data []string
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value []interface{}
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orderby string
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page int
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page_size int
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stmt *sql.Stmt
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}
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func (this *Query) Db(dbname string) *Query {
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this.dbname = dbname
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return this
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}
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func (this *Query) Table(tablename string) *Query {
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this.table = tablename
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return this
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}
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func (this *Query) Alias(tablename string) *Query {
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this.alias = tablename
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return this
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}
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func (this *Query) Title(title string) *Query {
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this.title = title
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return this
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}
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func (this *Query) Page(page int) *Query {
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this.page = page
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return this
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}
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func (this *Query) PageSize(page_num int) *Query {
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this.page_size = page_num
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return this
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}
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func (this *Query) Orderby(orderby string) *Query {
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this.orderby = orderby
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return this
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}
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func (this *Query) Where(where string) *Query {
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this.where = append(this.where, where)
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return this
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}
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func (this *Query) WhereOr(where string) *Query {
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this.where_or = append(this.where_or, where)
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return this
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}
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func (this *Query) Value(value interface{}) *Query {
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this.value = append(this.value, value)
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return this
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}
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func (this *Query) Join(join []string) *Query {
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this.join = append(this.join, join)
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return this
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}
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func (this *Query) Data(data string) *Query {
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this.data = append(this.data, data)
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return this
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}
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// func (this *Query) Insert(where string) *Query {
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// this.insert = append(this.insert, where)
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// return this
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// }
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// 拼查询sql
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func (this *Query) QueryStmt() error {
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if this.dbname == "" && this.table == "" {
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return errors.New("参数错误，没有数据表")
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}
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if len(this.where)+len(this.where_or) < len(this.value) {
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return errors.New("参数错误，条件值错误")
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}
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table := getTableName(this.dbname, this.table)
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var stmt *sql.Stmt
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var err error
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var sql, title string
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if this.title != "" {
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title = this.title
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} else {
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title = "*"
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}
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sql = helper.StringJoin("select ", title)
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if this.alias != "" {
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this.table = helper.StringJoin(table, " as ", this.alias)
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}
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sql = helper.StringJoin(sql, " from ", this.table)
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if len(this.join) > 0 {
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for _, joinitem := range this.join {
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if len(joinitem) < 2 {
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continue
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}
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if len(joinitem) == 3 {
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sql = helper.StringJoin(sql, " ", joinitem[2], " join ", getTableName(this.dbname, joinitem[0]), " on ", joinitem[1])
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} else { //默认左连接
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sql = helper.StringJoin(sql, " left join ", getTableName(this.dbname, joinitem[0]), " on ", joinitem[1])
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}
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}
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}
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if len(this.where) > 0 || len(this.where_or) > 0 {
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sql = helper.StringJoin(sql, " where ")
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}
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if len(this.where) > 0 {
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sql = helper.StringJoin(sql, " (", strings.Join(this.where, " and "), " ) ")
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}
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if len(this.where_or) > 0 {
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if len(this.where) > 0 {
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sql = helper.StringJoin(sql, " or ", strings.Join(this.where_or, " or "))
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} else {
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sql = helper.StringJoin(sql, strings.Join(this.where_or, " or "))
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}
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}
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if this.orderby != "" {
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sql = helper.StringJoin(sql, " order by ", this.orderby)
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}
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if this.page > 0 || this.page_size > 0 {
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if this.page < 0 {
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this.page = 0
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}
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if this.page_size < 1 {
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this.page_size = 10
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}
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from := strconv.Itoa(this.page * this.page_size)
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offset := strconv.Itoa(this.page_size)
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if from != "" && offset != "" {
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sql = helper.StringJoin(sql, " limit ", from, " , ", offset)
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}
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}
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log.Println(sql)
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stmt, err = DB.Prepare(sql)
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if err != nil {
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return err
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}
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this.stmt = stmt
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return nil
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}
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// 拼更新sql
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func (this *Query) UpdateStmt() error {
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if this.dbname == "" && this.table == "" {
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return errors.New("参数错误，没有数据表")
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}
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if len(this.where) < 1 {
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return errors.New("参数错误，缺少条件")
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}
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dbName := getTableName(this.dbname, this.table)
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var stmt *sql.Stmt
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var err error
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var sql string
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sql = helper.StringJoin("update ", dbName, " set ", strings.Join(this.data, " , "))
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sql = helper.StringJoin(sql, " where ", strings.Join(this.where, " and "))
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stmt, err = DB.Prepare(sql)
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if err != nil {
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return err
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}
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this.stmt = stmt
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return nil
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}
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// 拼插入sql
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func (this *Query) CreateStmt() error {
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if this.dbname == "" && this.table == "" {
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return errors.New("参数错误，没有数据表")
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}
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dbName := getTableName(this.dbname, this.table)
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var stmt *sql.Stmt
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var err error
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var sql string
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sql = helper.StringJoin("insert into ", dbName, " set ", strings.Join(this.data, " , "))
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stmt, err = DB.Prepare(sql)
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if err != nil {
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return err
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}
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this.stmt = stmt
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return nil
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}
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// 拼删除sql
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func (this *Query) DeleteStmt() error {
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if this.dbname == "" && this.table == "" {
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return errors.New("参数错误，没有数据表")
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}
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if len(this.where) < 1 {
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return errors.New("参数错误，缺少条件")
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}
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if len(this.where) != len(this.value) {
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return errors.New("参数错误，条件值错误")
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}
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dbName := getTableName(this.dbname, this.table)
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var stmt *sql.Stmt
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var err error
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var sql string
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sql = helper.StringJoin("delete from ", dbName, " where ", strings.Join(this.where, " and "))
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if this.page_size > 0 {
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sql = helper.StringJoin(sql, " limit ", strconv.Itoa(this.page_size))
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}
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stmt, err = DB.Prepare(sql)
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if err != nil {
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return err
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}
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this.stmt = stmt
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return nil
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}
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/**
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* 执行查询列表
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* return list error
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*/
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func (this *Query) Select() ([]map[string]string, error) {
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err := this.QueryStmt()
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if err != nil {
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return []map[string]string{}, err
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}
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if this.stmt == nil {
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return []map[string]string{}, errors.New("缺少必要参数")
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}
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return StmtForQueryList(this.stmt, this.value)
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}
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/**
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* 执行查询一条数据
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* return row error
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*/
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func (this *Query) Find() (map[string]string, error) {
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err := this.QueryStmt()
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if err != nil {
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return map[string]string{}, err
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}
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if this.stmt == nil {
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return nil, errors.New("缺少必要参数")
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}
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return StmtForQueryRow(this.stmt, this.value)
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}
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/**
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* 执行更新
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* return is_updated error
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*/
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func (this *Query) Update() (int64, error) {
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err := this.UpdateStmt()
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if err != nil {
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return 0, err
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}
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return StmtForUpdateExec(this.stmt, this.value)
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}
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/**
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* 执行删除
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* return is_delete error
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*/
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func (this *Query) Delete() (int64, error) {
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err := this.DeleteStmt()
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if err != nil {
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return 0, err
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}
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return StmtForUpdateExec(this.stmt, this.value)
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}
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/**
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* 执行写入
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* return is_insert error
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*/
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func (this *Query) Create() (int64, error) {
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err := this.CreateStmt()
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if err != nil {
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return 0, err
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}
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return StmtForInsertExec(this.stmt, this.value)
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}
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