最近在看vs2005上关于泛型的介绍,同时考虑到手头上使用的DBSERVICE库中文件过多(共7个CS文件),想利用泛型技术对它进行“瘦身”,最后系统只有2个文件。现把相关文件做一简单说明:
说明:DbAccess.cs文件, InitailDB函数采用反射进行相关信息搜集
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/// <summary>
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/// 初始化数据库信息
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="dai"></param>
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public static void InitailDB<T>(T dai)
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{
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Type type = dai.GetType();
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object[] args = null;
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concreteDbConn = (IDbConnection)type.GetMethod("CreateConnection").Invoke(dai, args);
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concreteDbConn.ConnectionString = (string) type.GetMethod("GetConnectionString").Invoke(dai, args);
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concreteDbConn.Open();
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concreteDbCommand = (IDbCommand)type.GetMethod("CreateCommand").Invoke(dai, args);
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concreteDbTrans = (IDbTransaction)type.GetMethod("CreateTransaction").Invoke(dai, new object[] { concreteDbConn });
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concreteDbCommand.Connection = concreteDbConn;
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concreteDbCommand.Transaction = concreteDbTrans;
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concreteDbAdapter = (IDbDataAdapter)type.GetMethod("CreateDataAdapter").Invoke(dai, args);
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}
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调用方法:CreateGenericInstance(),只要将相应的类型做为参数加入到InitailDB<T>中即可
InitailDB<Generic_Access<SqlConnection, SqlCommand, SqlDataAdapter>>(
Generic_Access < SqlConnection, SqlCommand, SqlDataAdapter >.GetInstance());break;
泛型类DB_Generic.cs代码如下 :
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最后是测试代码:using DB_Generic;
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public partial class DB_Generic_Default : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!Page.IsPostBack)
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{
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Response.Write(DbAccess.SelectMaxID("users", "ID") + "<BR>");
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string sql = "Select top 10 * From users Order By id asc";
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Repeater1.DataSource = DbAccess.SelectAllSqlString(sql).Tables[0].DefaultView;
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Repeater1.DataBind();
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.....
详情见 源代码
谢谢大家!
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