use mysql2 instead of mysql to support Mysql8

sidorares/node-mysql2#1021

Author: joe-re

packages/server/package.json

@@ -24,15 +24,15 @@
     "@types/pg": "^7.4.10",
     "jest": "^26.0.1",
     "log4js": "^6.2.1",
-    "mysql": "^2.15.0",
+    "mysql2": "^2.1.0",
     "node-ssh-forward": "^0.6.3",
     "pg": "^7.4.3",
+    "sqlint": "^0.9.2",
     "sqlite3": "^4.2.0",
     "vscode-languageclient": "^6.1.3",
     "vscode-languageserver": "^6.1.1",
     "vscode-languageserver-textdocument": "^1.0.1",
-    "yargs": "^12.0.1",
-    "sqlint": "^0.9.2"
+    "yargs": "^12.0.1"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^11.1.0",

packages/server/src/ambient.d.ts

@@ -1 +1,2 @@
 declare module 'yargs'
+declare module 'mysql2'

packages/server/src/database_libs/MysqlClient.ts

@@ -1,9 +1,10 @@
-import * as mysql from 'mysql'
+import * as mysql from 'mysql2'
+import * as mysqlType from 'mysql'
 import { Settings } from '../SettingStore'
 import AbstractClient, { RawField } from './AbstractClient'
 
 export default class MysqlClient extends AbstractClient {
-  connection: mysql.Connection | null = null
+  connection: mysqlType.Connection | null = null
 
   constructor(settings: Settings) {
     super(settings)
@@ -47,7 +48,7 @@ export default class MysqlClient extends AbstractClient {
           reject(new Error(err.message))
           return
         }
-        const tables = results.map((v: any) => v[`table_name`])
+        const tables = results.map((v: any) => v['table_name'] || v['TABLE_NAME'])
         resolve(tables)
       })
     })