c#连接字符串和DbUtils
2021/7/10 9:35:46
本文主要是介绍c#连接字符串和DbUtils,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
连接字符串
<connectionStrings> <add name="ConnectionStrings" connectionString="Data Source=IP地址;port=端口号;user id=用户名;password=密码;Charset=utf8" providerName="MySql.Data.MySqlClient" /><--c#账号密码连接MySQL数据库字符串--> <add name="ConnectionStrings" connectionString="Data Source=IP地址;User ID=用户名;Password=密码(可为空);Persist Security Info=True;" providerName="System.Data.SqlClient" /><--c#账号密码连接SqlServer数据库字符串--> <add name="ConnectionStrings" connectionString="data source=电脑名;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" /> </connectionStrings><--c#windows连接SqlServer数据库-->
dapper
public class DbUtils { private static object _obj = new object(); private static IDbConnection _connection = null; public static IDbConnection Main { get { IDbConnection dbContext = new SqlConnection(ConfigurationManager.ConnectionStrings["Default"].ConnectionString); return dbContext; } } public static SQLiteConnection SqliteConnection { get { SQLiteConnectionStringBuilder sb = new SQLiteConnectionStringBuilder(); sb.DataSource = Configs.DbPath; sb.Version = 3; sb.Password = Configs.DbPassWord; SQLiteConnection connection = null; if (connection == null) { lock (_obj) { if (connection == null) { connection = new SQLiteConnection(sb.ToString()); } } } return connection; } } /// <summary> /// using写法 /// </summary> public static IDbConnection SqlServerConnection { get { IDbConnection connection = null; if (connection == null) { lock (_obj) { if (connection == null) { connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Default"].ConnectionString); } } } return connection; } } /// <summary> /// 单例 /// </summary> /// <returns></returns> public static IDbConnection SqlServerInstance() { if (_connection == null) { lock (_obj) { if (_connection == null) // double-check { _connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Default"].ConnectionString); } } } return _connection; } }
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