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krust 2025-03-19 21:50:20 +08:00
parent f13aa5db7e
commit d1f54b33ea
10 changed files with 477 additions and 22 deletions
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111
Go入门速成/Day2/Class3 Gorm的使用.md
View File

@ -8,19 +8,41 @@ import (
"gorm.io/driver/mysql"
)
```
### 基本操作
- 1、连接数据库
### 连接数据库
```go
const (
USERNAME = "root"
PASSWD = "oppofindx2"
DATABASENAME = "Class"
)
dsn := fmt.Sprintf("%s:%s@tcp(127.0.0.1:3306)/%s?charset=utf8mb4&parseTime=True&loc=Local", USERNAME, PASSWD, DATABASENAME)
db := mysql.Open(dsn)
func main() {
// 初始化 Viper
viper.SetConfigName("config") // 配置文件名称（不带扩展名）
viper.SetConfigType("toml") // 配置文件类型
viper.AddConfigPath(".") // 配置文件路径
if err := viper.ReadInConfig(); err != nil {
log.Fatalf("Error reading config file: %v", err)
}
// 获取 database 配置
database := map[string]string{
"user": viper.GetString("mysql.user"),
"password": viper.GetString("mysql.password"),
"host": viper.GetString("mysql.host"),
"port": viper.GetString("mysql.port"),
"database": viper.GetString("mysql.database"),
}
// 打印 database 配置
fmt.Println("Database Config:", database)
// 构建 DSN（数据源名称）
dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
database["user"],
database["password"],
database["host"],
database["port"],
database["database"],)
// 连接数据库
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
log.Fatalf("Failed to connect to database: %v", err)
}
`````
- 2、数据库中表的定义
- 在Gorm中，定义一张表使用的是结构体
### 数据库定义模型（表格）
- 在Gorm中，定义一张表使用的是结构体
```go
type User struct {
gorm.Model
@ -28,4 +50,69 @@ type User struct {
Age int
}
```
- 自动迁移表结构（方便我们修改表，给表添加参数）
### 自动迁移表结构与创建表格
- 自动迁移表结构（方便我们修改表，给表添加参数），同时，如果没有该名字的表，Gorm则会创建他
```go
if err := db.AutoMigrate(&User{}); err != nil {
log.Fatalf("Failed to auto migrate: %v", err)
}
```
### CRUD操作
#### 创建数据
```go
//创建
user:=User{
Name: "John",
Age: 30,
}
if err := db.Create(&user).Error; err != nil {
log.Fatalf("Failed to create user: %v", err)
}
fmt.Println("User created successfully!")
```
#### 查询数据
```go
//搜索数
//单一搜索
var user1,user2,user3 User
if err := db.First(&user1, 1).Error; err != nil {
log.Fatalf("Failed to find user: %v", err)
}
user2.Name = "Jane"
if err=db.First(&user2).Error;err!=nil{
log.Fatalf("Failed to find user: %v", err)
}
if err:=db.Where("name = ?", "Alice").First(&user3);err!=nil{
log.Fatalf("Failed to find user: %v", err)
}
//查询多条记录
var users []User
if err:=db.Where("age > ?", 20).Find(&users);err!=nil{
log.Fatalf("Failed to find users: %v", err)
}
// 查询时避免RecordNotFound错误
err := db.Where("name = ?", "Bob").First(&user).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
fmt.Println("User not found")
}
```
#### 更新记录
- update方式
```go
// 更新单个字段
db.Model(&user).Update("Age", 30)
// 更新多个字段（零值需使用map）
db.Model(&user).Updates(map[string]interface{}{"Age": 30, "Name": ""})
// 使用结构体更新（忽略零值）
db.Model(&user).Updates(User{Name: "Alice", Age: 0}) // Age不会被更新
```
- save方式
```
db.Save(&user) //更新所有字段
db.Save(&user).Omit("Name") //更新除Name字段外的所有字段
```
#### 删除记录
```go
db.Delete(&user) //软删除
db.Unscoped().Delete(&user) //直接强制删除
```

9
Go入门速成/Day2/ExampleCode/Gorm/config.toml Normal file
View File

@ -0,0 +1,9 @@
app_name = "Class"
port = 8080
[mysql]
host = "localhost"
port = 3306
user = "yzk_study"
password = "yzk722923"
dbname="Class"

20
Go入门速成/Day2/ExampleCode/Gorm/go.mod
View File

@ -4,9 +4,27 @@ go 1.24.1
require gorm.io/driver/mysql v1.5.7
require (
github.com/fsnotify/fsnotify v1.8.0 // indirect
github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
github.com/pelletier/go-toml/v2 v2.2.3 // indirect
github.com/sagikazarmark/locafero v0.7.0 // indirect
github.com/sourcegraph/conc v0.3.0 // indirect
github.com/spf13/afero v1.12.0 // indirect
github.com/spf13/cast v1.7.1 // indirect
github.com/spf13/pflag v1.0.6 // indirect
github.com/subosito/gotenv v1.6.0 // indirect
go.uber.org/atomic v1.9.0 // indirect
go.uber.org/multierr v1.9.0 // indirect
golang.org/x/sys v0.29.0 // indirect
golang.org/x/text v0.21.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)
require (
github.com/go-sql-driver/mysql v1.7.0 // indirect
github.com/jinzhu/inflection v1.0.0 // indirect
github.com/jinzhu/now v1.1.5 // indirect
gorm.io/gorm v1.25.7 // indirect
github.com/spf13/viper v1.20.0
gorm.io/gorm v1.25.7
)

36
Go入门速成/Day2/ExampleCode/Gorm/go.sum
View File

@ -1,9 +1,45 @@
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fsnotify/fsnotify v1.8.0 h1:dAwr6QBTBZIkG8roQaJjGof0pp0EeF+tNV7YBP3F/8M=
github.com/fsnotify/fsnotify v1.8.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
github.com/go-sql-driver/mysql v1.7.0 h1:ueSltNNllEqE3qcWBTD0iQd3IpL/6U+mJxLkazJ7YPc=
github.com/go-sql-driver/mysql v1.7.0/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
github.com/go-viper/mapstructure/v2 v2.2.1 h1:ZAaOCxANMuZx5RCeg0mBdEZk7DZasvvZIxtHqx8aGss=
github.com/go-viper/mapstructure/v2 v2.2.1/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/sagikazarmark/locafero v0.7.0 h1:5MqpDsTGNDhY8sGp0Aowyf0qKsPrhewaLSsFaodPcyo=
github.com/sagikazarmark/locafero v0.7.0/go.mod h1:2za3Cg5rMaTMoG/2Ulr9AwtFaIppKXTRYnozin4aB5k=
github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
github.com/spf13/afero v1.12.0 h1:UcOPyRBYczmFn6yvphxkn9ZEOY65cpwGKb5mL36mrqs=
github.com/spf13/afero v1.12.0/go.mod h1:ZTlWwG4/ahT8W7T0WQ5uYmjI9duaLQGy3Q2OAl4sk/4=
github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/spf13/viper v1.20.0 h1:zrxIyR3RQIOsarIrgL8+sAvALXul9jeEPa06Y0Ph6vY=
github.com/spf13/viper v1.20.0/go.mod h1:P9Mdzt1zoHIG8m2eZQinpiBjo6kCmZSKBClNNqjJvu4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
go.uber.org/multierr v1.9.0/go.mod h1:X2jQV1h+kxSjClGpnseKVIxpmcjrj7MNnI0bnlfKTVQ=
golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gorm.io/driver/mysql v1.5.7 h1:MndhOPYOfEp2rHKgkZIhJ16eVUIRf2HmzgoPmh7FCWo=
gorm.io/driver/mysql v1.5.7/go.mod h1:sEtPWMiqiN1N1cMXoXmBbd8C6/l+TESwriotuRRpkDM=
gorm.io/gorm v1.25.7 h1:VsD6acwRjz2zFxGO50gPO6AkNs7KKnvfzUjHQhZDz/A=

101
Go入门速成/Day2/ExampleCode/Gorm/main.go
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@ -1,24 +1,107 @@
package main
import (
"errors"
"fmt"
"log"
"github.com/spf13/viper"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
const (
USERNAME = "root"
PASSWD = "oppofindx2"
DATABASENAME = "Class"
)
func main() {
dsn := fmt.Sprintf("%s:%s@tcp(127.0.0.1:3306)/%s?charset=utf8mb4&parseTime=True&loc=Local", USERNAME, PASSWD, DATABASENAME)
db := mysql.Open(dsn)
print(db)
// 初始化 Viper
viper.SetConfigName("config") // 配置文件名称（不带扩展名）
viper.SetConfigType("toml") // 配置文件类型
viper.AddConfigPath(".") // 配置文件路径
if err := viper.ReadInConfig(); err != nil {
log.Fatalf("Error reading config file: %v", err)
}
// 获取 database 配置
database := map[string]string{
"user": viper.GetString("mysql.user"),
"password": viper.GetString("mysql.password"),
"host": viper.GetString("mysql.host"),
"port": viper.GetString("mysql.port"),
"database": viper.GetString("mysql.database"),
}
// 打印 database 配置
fmt.Println("Database Config:", database)
// 构建 DSN（数据源名称）
dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
database["user"],
database["password"],
database["host"],
database["port"],
database["database"],
)
// 连接数据库
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
log.Fatalf("Failed to connect to database: %v", err)
}
// 打印 db 对象
fmt.Println("Database connection successful:", db)
//自动迁移表结构
if err := db.AutoMigrate(&User{}); err != nil {
fmt.Println("Auto migration failed:", err)
}
fmt.Println("Auto migration successful!")
//创建
user := User{
Name: "John",
Age: 30,
}
if err := db.Create(&user).Error; err != nil {
log.Fatalf("Failed to create user: %v", err)
}
fmt.Println("User created successfully!")
//搜索数据
//单一搜索
var user1, user2, user3 User
if err := db.First(&user1, 1).Error; err != nil {
log.Fatalf("Failed to find user: %v", err)
}
user2.Name = "Jane"
if err = db.First(&user2).Error; err != nil {
log.Fatalf("Failed to find user: %v", err)
}
if err := db.Where("name = ?", "Alice").First(&user3); err != nil {
log.Fatalf("Failed to find user: %v", err)
}
//查询多条记录
var users []User
if err := db.Where("age > ?", 20).Find(&users); err != nil {
log.Fatalf("Failed to find users: %v", err)
}
// 查询时避免RecordNotFound错误
err = db.Where("name = ?", "Bob").First(&user).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
fmt.Println("User not found")
}
//更新（UPDATE）
db.Model(&user).Update("Age", 40)
// 更新多个字段（零值需使用map）
db.Model(&user).Updates(map[string]interface{}{"Age": 30, "Name": ""})
// 使用结构体更新（忽略零值）
db.Model(&user).Updates(User{Name: "Alice", Age: 0}) // Age不会被更新
//更新（SAVE）
db.Save(&user) //更新所有字段
db.Save(&user).Omit("Name") //更新除Name字段外的所有字段
//删除
db.Delete(&user) //软删除
db.Unscoped().Delete(&user) //直接强制删除
}
// 定义 User 模型
type User struct {
gorm.Model
Name string

9
Go入门速成/Day2/ExampleCode/Toml/config.toml Normal file
View File

@ -0,0 +1,9 @@
app_name = "Class"
port = 8080
[database]
host = "localhost"
port = 3306
user = "yzk_study"
password = "yzk722923"
dbname="Class"

22
Go入门速成/Day2/ExampleCode/Toml/go.mod Normal file
View File

@ -0,0 +1,22 @@
module Toml
go 1.24.1
require github.com/spf13/viper v1.20.0
require (
github.com/fsnotify/fsnotify v1.8.0 // indirect
github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
github.com/pelletier/go-toml/v2 v2.2.3 // indirect
github.com/sagikazarmark/locafero v0.7.0 // indirect
github.com/sourcegraph/conc v0.3.0 // indirect
github.com/spf13/afero v1.12.0 // indirect
github.com/spf13/cast v1.7.1 // indirect
github.com/spf13/pflag v1.0.6 // indirect
github.com/subosito/gotenv v1.6.0 // indirect
go.uber.org/atomic v1.9.0 // indirect
go.uber.org/multierr v1.9.0 // indirect
golang.org/x/sys v0.29.0 // indirect
golang.org/x/text v0.21.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)

52
Go入门速成/Day2/ExampleCode/Toml/go.sum Normal file
View File

@ -0,0 +1,52 @@
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
github.com/fsnotify/fsnotify v1.8.0 h1:dAwr6QBTBZIkG8roQaJjGof0pp0EeF+tNV7YBP3F/8M=
github.com/fsnotify/fsnotify v1.8.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
github.com/go-viper/mapstructure/v2 v2.2.1 h1:ZAaOCxANMuZx5RCeg0mBdEZk7DZasvvZIxtHqx8aGss=
github.com/go-viper/mapstructure/v2 v2.2.1/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
github.com/sagikazarmark/locafero v0.7.0 h1:5MqpDsTGNDhY8sGp0Aowyf0qKsPrhewaLSsFaodPcyo=
github.com/sagikazarmark/locafero v0.7.0/go.mod h1:2za3Cg5rMaTMoG/2Ulr9AwtFaIppKXTRYnozin4aB5k=
github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
github.com/spf13/afero v1.12.0 h1:UcOPyRBYczmFn6yvphxkn9ZEOY65cpwGKb5mL36mrqs=
github.com/spf13/afero v1.12.0/go.mod h1:ZTlWwG4/ahT8W7T0WQ5uYmjI9duaLQGy3Q2OAl4sk/4=
github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/spf13/viper v1.20.0 h1:zrxIyR3RQIOsarIrgL8+sAvALXul9jeEPa06Y0Ph6vY=
github.com/spf13/viper v1.20.0/go.mod h1:P9Mdzt1zoHIG8m2eZQinpiBjo6kCmZSKBClNNqjJvu4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
go.uber.org/multierr v1.9.0/go.mod h1:X2jQV1h+kxSjClGpnseKVIxpmcjrj7MNnI0bnlfKTVQ=
golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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Go入门速成/Day2/ExampleCode/Toml/main.go Normal file
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@ -0,0 +1,25 @@
package main
import (
"fmt"
"github.com/spf13/viper"
)
func main() {
viper.SetConfigName("config") // 配置文件名称（不需要带后缀）
viper.SetConfigType("toml") // 配置文件类型
viper.AddConfigPath(".") // 配置文件路径
err := viper.ReadInConfig() // 读取配置文件
if err != nil {
fmt.Printf("配置文件读取失败: %v\n", err)
return
}
fmt.Println(viper.GetString("app_name"))
fmt.Println(viper.GetInt("port"))
fmt.Println(viper.GetString("database.host"))
fmt.Println(viper.GetInt("database.port"))
fmt.Println(viper.GetString("database.user"))
fmt.Println(viper.GetString("database.password"))
}

114
Go入门速成/Day2/序篇 Toml文件.md Normal file
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### TOML 简介
TOML（Tom's Obvious, Minimal Language）是一种配置文件格式，旨在易于阅读和编写。它的语法类似于INI文件，但更强大和灵活。
#### 基本语法
1. **键值对**：
```toml
key = "value"
```
2. **字符串**：
```toml
string = "Hello, World!"
multi_line_string = """
This is a
multi-line string.
"""
```
3. **数字**：
```toml
integer = 42
float = 3.14
```
4. **布尔值**：
```toml
boolean = true
```
5. **数组**：
```toml
array = [1, 2, 3]
```
6. **表（嵌套结构）**：
```toml
[table]
key = "value"
```
7. **数组表**：
```toml
[[array_table]]
name = "Alice"
[[array_table]]
name = "Bob"
```
### 使用 Go 的 Viper 解析 TOML
在go中，有很多的库可以解析Toml,在这里我推荐使用Viper来进行处理。Viper 是一个强大的 Go 库，用于处理配置文件，支持多种格式，不仅仅是TOML。
#### 示例代码
1. **创建 TOML 文件**（`config.toml`）：
```toml
app_name = "Class"
port = 8080
[database]
host = "localhost"
port = 3306
user = "yzk_study"
password = "yzk722923"
```
2. **使用 Viper 解析 TOML**：
```go
package main
import (
"fmt"
"github.com/spf13/viper"
)
func main() {
// 设置配置文件名和路径
viper.SetConfigName("config") // 文件名（不带扩展名）
viper.SetConfigType("toml") // 文件类型
viper.AddConfigPath(".") // 查找路径
// 读取配置文件
if err := viper.ReadInConfig(); err != nil {
panic(fmt.Errorf("Fatal error config file: %s \n", err))
}
// 获取配置值
appName := viper.GetString("app_name")
port := viper.GetInt("port")
dbHost := viper.GetString("database.host")
dbPort := viper.GetInt("database.port")
fmt.Printf("App Name: %s\n", appName)
fmt.Printf("Port: %d\n", port)
fmt.Printf("Database Host: %s\n", dbHost)
fmt.Printf("Database Port: %d\n", dbPort)
}
```
#### 运行结果
```bash
App Name: MyApp
Port: 8080
Database Host: localhost
Database Port: 5432
```
### 总结
- **TOML** 是一种易于阅读和编写的配置文件格式。
- **Viper** 是一个强大的 Go 库，支持多种配置文件格式，包括 TOML。
- 通过 Viper，可以轻松读取和解析 TOML 文件中的配置项。