mirror of
https://gitee.com/johng/gf.git
synced 2024-11-30 11:18:02 +08:00
143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gdb
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import (
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"fmt"
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"strings"
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"github.com/gogf/gf/text/gstr"
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"github.com/gogf/gf/os/gtime"
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"github.com/gogf/gf/encoding/gbinary"
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"github.com/gogf/gf/text/gregex"
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"github.com/gogf/gf/util/gconv"
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)
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// 字段类型转换，将数据库字段类型转换为golang变量类型
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func (bs *dbBase) convertValue(fieldValue []byte, fieldType string) interface{} {
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t, _ := gregex.ReplaceString(`\(.+\)`, "", fieldType)
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t = strings.ToLower(t)
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switch t {
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case "binary", "varbinary", "blob", "tinyblob", "mediumblob", "longblob":
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return fieldValue
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case "int", "tinyint", "small_int", "medium_int":
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if gstr.ContainsI(fieldType, "unsigned") {
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gconv.Uint(string(fieldValue))
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}
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return gconv.Int(string(fieldValue))
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case "big_int":
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if gstr.ContainsI(fieldType, "unsigned") {
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gconv.Uint64(string(fieldValue))
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}
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return gconv.Int64(string(fieldValue))
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case "float", "double", "decimal":
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return gconv.Float64(string(fieldValue))
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case "bit":
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s := string(fieldValue)
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// 这里的字符串判断是为兼容不同的数据库类型，如: mssql
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if strings.EqualFold(s, "true") {
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return 1
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}
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if strings.EqualFold(s, "false") {
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return 0
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}
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return gbinary.BeDecodeToInt64(fieldValue)
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case "bool":
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return gconv.Bool(fieldValue)
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case "datetime":
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t, _ := gtime.StrToTime(string(fieldValue))
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return t.String()
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default:
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// 自动识别类型, 以便默认支持更多数据库类型
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switch {
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case strings.Contains(t, "int"):
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return gconv.Int(string(fieldValue))
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case strings.Contains(t, "text") || strings.Contains(t, "char"):
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return string(fieldValue)
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case strings.Contains(t, "float") || strings.Contains(t, "double"):
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return gconv.Float64(string(fieldValue))
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case strings.Contains(t, "bool"):
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return gconv.Bool(string(fieldValue))
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case strings.Contains(t, "binary") || strings.Contains(t, "blob"):
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return fieldValue
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default:
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return string(fieldValue)
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}
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}
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}
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// 将map的数据按照fields进行过滤，只保留与表字段同名的数据
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func (bs *dbBase) filterFields(table string, data map[string]interface{}) map[string]interface{} {
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if fields, err := bs.db.TableFields(table); err == nil {
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for k, _ := range data {
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if _, ok := fields[k]; !ok {
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delete(data, k)
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}
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}
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}
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return data
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}
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// 返回当前数据库所有的数据表名称
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func (bs *dbBase) Tables() (tables []string, err error) {
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result := (Result)(nil)
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result, err = bs.GetAll(`SHOW TABLES`)
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if err != nil {
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return
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}
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for _, m := range result {
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for _, v := range m {
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tables = append(tables, v.String())
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}
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}
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return
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}
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// 获得指定表表的数据结构，构造成map哈希表返回，其中键名为表字段名称，键值为字段数据结构.
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func (bs *dbBase) TableFields(table string) (fields map[string]*TableField, err error) {
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// 缓存不存在时会查询数据表结构，缓存后不过期，直至程序重启(重新部署)
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v := bs.cache.GetOrSetFunc("table_fields_"+table, func() interface{} {
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result := (Result)(nil)
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result, err = bs.GetAll(fmt.Sprintf(`SHOW COLUMNS FROM %s`, bs.db.quoteWord(table)))
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if err != nil {
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return nil
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}
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fields = make(map[string]*TableField)
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for i, m := range result {
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fields[m["Field"].String()] = &TableField{
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Index: i,
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Name: m["Field"].String(),
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Type: m["Type"].String(),
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Null: m["Null"].Bool(),
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Key: m["Key"].String(),
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Default: m["Default"].Val(),
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Extra: m["Extra"].String(),
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}
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}
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return fields
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}, 0)
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if err == nil {
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fields = v.(map[string]*TableField)
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}
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return
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}
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