mirror of
https://gitee.com/johng/gf.git
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119 lines
3.7 KiB
Go
119 lines
3.7 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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"github.com/gogf/gf/g/util/gconv"
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"github.com/gogf/gf/g/text/gregex"
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"strings"
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)
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/*
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// 同步数据库表结构到内存中
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func (bs *dbBase) syncTableStructure() {
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bs.tables = make(map[string]map[string]string)
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for _, table := range bs.db.getTables() {
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bs.tables[table], _ = bs.db.getTableFields(table)
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}
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}
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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 interface{}, 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 gconv.Bytes(fieldValue)
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case "bit", "int", "tinyint", "small_int", "medium_int":
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return gconv.Int(fieldValue)
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case "big_int":
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return gconv.Int64(fieldValue)
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case "float", "double", "decimal":
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return gconv.Float64(fieldValue)
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case "bool":
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return gconv.Bool(fieldValue)
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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(fieldValue)
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case strings.Contains(t, "text") || strings.Contains(t, "char"):
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return gconv.String(fieldValue)
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case strings.Contains(t, "float") || strings.Contains(t, "double"):
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return gconv.Float64(fieldValue)
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case strings.Contains(t, "bool"):
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return gconv.Bool(fieldValue)
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case strings.Contains(t, "binary") || strings.Contains(t, "blob"):
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return gconv.Bytes(fieldValue)
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default:
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return gconv.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.getTableFields(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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// 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，键值暂无用途(默认为字段数据类型).
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func (bs *dbBase) getTableFields(table string) (fields map[string]string, 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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charL, charR := bs.db.getChars()
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result, err = bs.GetAll(fmt.Sprintf(`SHOW COLUMNS FROM %s%s%s`, charL, table, charR))
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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]string)
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for _, m := range result {
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fields[m["Field"].String()] = m["Type"].String()
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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]string)
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}
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return
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}
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/*
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// 获取当前数据库所有的表结构
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func (bs *dbBase) getTables() []string {
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if result, _ := bs.GetAll(`SHOW TABLES`); result != nil {
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array := make([]string, len(result))
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for i, m := range result {
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for _, v := range m {
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array[i] = v.String()
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break
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}
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}
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return array
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}
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return nil
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}
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*/ |