Enterprise Library 对大家来说应该不陌生,很早我就听说了这个东西,但一直没有时间来学习,最近终于抽出时间来学习Enterprise Library,现在就把我学习过程中的一些实例发上来,供大家参考.Enterprise Library现在已经有2.0版本了,但我也是后来才看到的,其他的就不多说了,先说1.0里面的Data Access Application Block,以后有时间在研究2.0.
本来先看的是其中的Configuration Application Block,但我在Web项目中调试写入XML时总是不能成功,后来查资料得知Web项目中的config文件不能通过程序来修改或创建,不知道是否确有此事,还望高手指点,另外还不明白的是 Configuration Application Block在我们实际项目的开发中能起到什么样的作用,昨天也没想通.
好了,我们来看看Data Access Application Block 吧,首先我们看一下如何用Enterprise Library 提供的配置工具来创建一个数据库实例.首先我们应该新建我们所需项目,然后在Enterprise Library的安装目录的Bin目录中找到EntLibConfig.exe文件,双击打开,并选择File-->Open Application,打开刚刚新建项目的Web.Config文件,如下:
然后,右键单击Application,选择New--> DataAccess Application Block,如下图:
然后会自动在Data Access Block 节点下生成三个Connection String(保存新建的数据库实例的连接字符串信息),DataBaseInstance(此节点存放数据库实例名以及其他相关信息),DataBase Types(节点存放数据库类型,如Sql Server 或 Oracle等).接着我们在 Connection String 下的 Sql Connection String 下配置好我们的数据库连接信息(包括Server,Database,uid,pwd等).
上面所说的都配置好了以后,我们就可以点击 File-->Save All或Ctrl + Shift + S,如果配置没有错误的话,就会在你的项目中生成一个dataConfiguration.config文件,内容如下:
<?xml version="1.0" encoding="utf-8"?><dataConfiguration> <xmlSerializerSection type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null"> <enterpriseLibrary.databaseSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" defaultInstance="EnterpriseLibrary" xmlns="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/data"> <databaseTypes> <databaseType name="Sqlserver" type="Microsoft.Practices.EnterpriseLibrary.Data.Sql.SqlDatabase, Microsoft.Practices.EnterpriseLibrary.Data, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null" /> </databaseTypes> <instances> <instance name="EnterpriseLibrary" type="Sqlserver" connectionString="Sql Connection String" /> </instances> <connectionStrings> <connectionString name="Sql Connection String"> <parameters> <parameter name="database" value="EnterpriseLibrary" isSensitive="false" /> <parameter name="Integrated Security" value="True" isSensitive="false" /> <parameter name="pwd" value="" isSensitive="true" /> <parameter name="server" value="shy" isSensitive="false" /> <parameter name="uid" value="sa" isSensitive="false" /> </parameters> </connectionString> </connectionStrings> </enterpriseLibrary.databaseSettings> </xmlSerializerSection></dataConfiguration>在Web.config文件中加入了下面内容:
<configSections> <section name="enterpriselibrary.configurationSettings" type="System.Configuration.IgnoreSectionHandler, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </configSections> <enterpriselibrary.configurationSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" applicationName="Application" xmlns="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/configuration"> <configurationSections> <configurationSection xsi:type="ReadOnlyConfigurationSectionData" name="dataConfiguration" encrypt="false"> <storageProvider xsi:type="XmlFileStorageProviderData" name="XML File Storage Provider" path="dataConfiguration.config" /> <dataTransformer xsi:type="XmlSerializerTransformerData" name="Xml Serializer Transformer"> <includeTypes /> </dataTransformer> </configurationSection> </configurationSections> <keyAlgorithmStorageProvider xsi:nil="true" /> <includeTypes /></enterpriselibrary.configurationSettings>到此为止,我们使用Data Access Application Block 的配置文件就基本上配置好了,下面我们来看看DataAccess Application Block 的几种基本操作:
首先我们建立名为EnterpriseLibrary的数据库(这个应该在配置之前先建好的),在此数据库中建一张表,名为 Person .
需要引用的程序集如下:
Microsoft.Practices.EnterpriseLibrary.Data
Microsoft.Practices.EnterpriseLibrary.Configuration
1.ExecuteNonQuery
/// <summary>
/// 执行ExecuteNonQuery
/// </summary> public void AddPerson() {
Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); db.ExecuteNonQuery(CommandType.Text,"insert into person values(1,'pw',23,'男','3304122')"); }2.ExecuteReader
/// <summary> /// 执行ExecuteReader，返回Person列表 /// </summary> /// <returns></returns> public IDataReader GetPersonList() { Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); string sql = "select * from person"; DBCommandWrapper dw = db.GetSqlStringCommandWrapper(sql); return db.ExecuteReader(dw); }3.ExecuteDataSet
/// <summary> /// 执行ExecuteDataSet，返回Person列表 /// </summary> /// <returns></returns> public DataSet GetPersonList() { Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); string sql = "select * from person"; DBCommandWrapper dw = db.GetSqlStringCommandWrapper(sql); return db.ExecuteDataSet(dw); }
4.ExecuteScalar
/// <summary> /// 执行ExecuteScalar,返回单一的值 /// </summary> /// <returns></returns> public int GetPersonNum() { Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); string sql = "select count(*) from person"; DBCommandWrapper dw = db.GetSqlStringCommandWrapper(sql); return (int)db.ExecuteScalar(dw); }5.执行存储过程
//执行存储过程 //首先我们在数据库中建一个名为"SelectPersonBySex"的存储过程 //如果有输入参数可以这样写：dw.AddOutParameter("@sex",System.Data.DbType.String,'男'); //执行完存储过程后取输出参数的值的方法是：dw.GetParameterValue("@sex"); public DataSet GetPersonListBySex(string sex) { Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); DBCommandWrapper dw = db.GetStoredProcCommandWrapper("SelectPersonBySex"); dw.AddInParameter("@sex",System.Data.DbType.String,sex); return db.ExecuteDataSet(dw); }6.在程序中加入事务
public void InsertPerson() { //创建数据库实例 Database db = DatabaseFactory.CreateDatabase("EnterpriseLibrary"); //在程序中加入事务 using (IDbConnection conn = db.GetConnection())
{
//打开连接 conn.Open(); //建立一个事务 System.Data.IDbTransaction trans = conn.BeginTransaction(); try { //循环向person表插入记录 for(int i=2;i<10;i++) { db.ExecuteNonQuery(CommandType.Text,@"insert into person values(" + i + ",'pw1',23,'男','3304122')");
} //提交事务 trans.Commit(); } catch(Exception) { //回滚事务 trans.Rollback(); } finally { //关闭连接 conn.Close(); } } }关于DataAccess Application Block 的基本操作就说到这,以后再有更深的研究我继续往上发,还有想了解一下,学过Enterprise Library的朋友们对它的看法,欢迎在此发表你的个人意见.
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