1. [Rust] diesel支持mysql方法

如果使用rocket框架，那么就不需要往下看了。因为rocket框架已经内置了ORM

配置diesel遇到了N个坑！在这里记录一下！我的电脑是win10 64位。diesel是数据库持久层。

开始操作

• 访问 https://downloads.mysql.com/archives/c-c/ 下载 mysql-connector-c-6.1.11-winx64安装
• 找到mysql-connector-c安装路径, 我的路径如下 C:\Program Files\MySQL\MySQL Connector C 6.1\lib\vs14
• 以管理员权限启动CMD, 执行如下命令

setx MYSQLCLIENT_LIB_DIR "C:\Program Files\MySQL\MySQL Connector C 6.1\lib\vs14"

• 配置config文件,文件路径为 C:\Users\用户名\.cargo\config,如果不存在那就创建config文件,内容如下。

#配置使用中科大源
[http]
check-revoke = false

[source.crates-io]
replace-with = 'ustc'

[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"

#配置mysql编译
[build]
rustflags = ["-L", "C:\\Program Files\\MySQL\\MySQL Connector C 6.1\\lib\\vs14"]

在上面的配置文件中有[build]配置内容，这一步非常重要，如果在这里不进行配置的话，即使是diesel安装成功了，但是项目启动时无法正常启动，原因是在编译、测试时还是要这个环境变量，因为其中的依赖diesel = { version = "1.4.5", features = ["mysql"] }需要它

• 安装diesel

cargo install diesel_cli --no-default-features --features mysql

• 安装完成后执行diesel，结果如下。

C:\WINDOWS\system32>diesel
diesel 1.4.1

USAGE:
    diesel [FLAGS] [OPTIONS] 

FLAGS:
        --locked-schema    Require that the schema file is up to date
    -h, --help             Prints help information
    -V, --version          Prints version information

OPTIONS:
        --config-file       The location of the configuration file to use. Falls back to the
                                         `DIESEL_CONFIG_FILE` environment variable if unspecified. Defaults to
                                         `diesel.toml` in your project root. See diesel.rs/guides/configuring-diesel-cli
                                         for documentation on this file.
        --database-url     Specifies the database URL to connect to. Falls back to the DATABASE_URL
                                         environment variable if unspecified.

SUBCOMMANDS:
    bash-completion    DEPRECATED: Generate bash completion script for the diesel command.
    completions        Generate shell completion scripts for the diesel command.
    database           A group of commands for setting up and resetting your database.
    help               Prints this message or the help of the given subcommand(s)
    migration          A group of commands for generating, running, and reverting migrations.
    print-schema       Print table definitions for database schema.
    setup              Creates the migrations directory, creates the database specified in your DATABASE_URL, and
                       runs existing migrations.

You can also run `diesel SUBCOMMAND -h` to get more information about that subcommand.