电商总结（三）构建数据库的主从架构

<summary> /// 根据数据库的语句，选择相应的DB /// </summary> /// <param name="sql"></param> /// <param name="commandType"></param> /// <returns></returns> public static DB SelectDB(string sql, CommandType commandType) { bool redirect2WritableDB = false; sql = sql.Trim().TrimStart(‘\r‘).TrimStart(‘\n‘); if (sql.IndexOf("UPDATE", StringComparison.OrdinalIgnoreCase) >= 0) redirect2WritableDB = true; if (sql.IndexOf("DELETE", StringComparison.OrdinalIgnoreCase) >= 0) redirect2WritableDB = true; if (sql.IndexOf("INSERT", StringComparison.OrdinalIgnoreCase) >= 0) redirect2WritableDB = true; if (sql.IndexOf("CREATE", StringComparison.OrdinalIgnoreCase) >= 0) redirect2WritableDB = true; if (sql.IndexOf("ALTER", StringComparison.OrdinalIgnoreCase) >= 0) redirect2WritableDB = true; //// 如果是存储过程，则默认是取Writable DB。 if (redirect2WritableDB || commandType == CommandType.StoredProcedure) { return DBConfiguration.WritableDB; } else { int random = GenerateRandomNumber(); int dbIndex = random % DBConfiguration.ReadDBs.Count; return DBConfiguration.ReadDBs[dbIndex]; } }

　　　　同时，增加相关的数据库配置

<?xml version="1.0" encoding="utf-8" ?>
<ConnectionString>
  <WritableDB>Data Source=192.168.99.242; Initial Catalog=DBTest; Uid=sa;pwd=test123; MultipleActiveResultSets=True</WritableDB>
  <ReadDBs>
    <DB>Data Source=192.168.99.241; Initial Catalog=DBTest; Uid=sa;pwd=test123; MultipleActiveResultSets=True</DB>
  </ReadDBs>
</ConnectionString>

 

电商总结（三）构建数据库的主从架构

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