EnterpriseLibrary数据访问(2)使用存储过程访问数据库

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<configuration>

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<configSections>

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<section name=

"dataConfiguration"

type=

"Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings,Microsoft.Practices.EnterpriseLibrary.Data,Version=5.0.414.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35"

requirePermission=

"true"

/>

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</configSections>

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<dataConfiguration defaultDatabase=

"QuickStarts Instance"

/>

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<connectionStrings>

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<add name=

"QuickStarts Instance"

connectionString=

"Database=EntLibQuickStarts;Server=(local);Integrated Security=SSPI;"

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providerName=

"System.Data.SqlClient"

/>

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</connectionStrings>

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</configuration>

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// TODO: Use Enterprise Library Data Block

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using

Microsoft.Practices.EnterpriseLibrary.Data;

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using

Microsoft.Practices.EnterpriseLibrary.Common.Configuration;

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// TODO: Create private field for Database

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private

Database _db = EnterpriseLibraryContainer.Current.GetInstance<Database>(

"QuickStarts Instance"

);

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private

void

MainForm_Load(

object

sender,System.EventArgs e)

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{

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this

.cmbCategory.Items.Clear();

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// TODO: Use a DataReader to retrieve Categories

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using

(IDataReader rd = _db.ExecuteReader(

"GetCategories"

))

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{

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while

(rd.Read())

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{

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Category item =

new

Category(

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rd.GetInt32(0),

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rd.GetString(1),

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rd.GetString(2)

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);

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this

.cmbCategory.Items.Add(item);

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}

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}

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if

(

this

.cmbCategory.Items.Count >0)

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this

.cmbCategory.SelectedIndex = 0;

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}

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private

void

cmbCategory_SelectedIndexChanged(

object

sender,System.EventArgs e)

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{

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this

.dsProducts.Clear();

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Category selectedCategory = (Category)

this

.cmbCategory.SelectedItem;

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if

(selectedCategory ==

null

)

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return

;

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// TODO: Retrieve Products by Category

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//将存储过程返回的表填充到DataSet 使用表名products,selectedCategory.CategoryID是参数

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_db.LoadDataSet(

"GetProductsByCategory"

,

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this

.dsProducts,

new

string

[] {

"products"

},

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selectedCategory.CategoryId);

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}

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private

void

btnSave_Click(

object

sender,System.EventArgs e)

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{

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// TODO: Use the DataSet to update the Database

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System.Data.Common.DbCommand insertCommand =

null

;

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insertCommand = _db.GetStoredProcCommand(

"HOLAddProduct"

);

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_db.AddInParameter(insertCommand,

"ProductName"

,DbType.String,

"ProductName"

,DataRowVersion.Current);

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_db.AddInParameter(insertCommand,

"CategoryID"

,DbType.Int32,

"CategoryID"

,DataRowVersion.Current);

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_db.AddInParameter(insertCommand,

"UnitPrice"

,DbType.Currency,

"UnitPrice"

,DataRowVersion.Current);

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System.Data.Common.DbCommand deleteCommand =

null

;

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deleteCommand = _db.GetStoredProcCommand(

"HOLDeleteProduct"

);

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_db.AddInParameter(deleteCommand,

"ProductID"

,DbType.Int32,

"ProductID"

,DataRowVersion.Current);

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_db.AddInParameter(deleteCommand,

"LastUpdate"

,DbType.DateTime,

"LastUpdate"

,DataRowVersion.Original);

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System.Data.Common.DbCommand updateCommand =

null

;updateCommand = _db.GetStoredProcCommand(

"HOLUpdateProduct"

);

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_db.AddInParameter(updateCommand,

"ProductID"

,DbType.Int32,

"ProductID"

,DataRowVersion.Current);

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_db.AddInParameter(updateCommand,

"ProductName"

,DbType.String,

"ProductName"

,DataRowVersion.Current);

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_db.AddInParameter(updateCommand,

"CategoryID"

,DbType.Int32,

"CategoryID"

,DataRowVersion.Current);

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_db.AddInParameter(updateCommand,

"UnitPrice"

,DbType.Currency,

"UnitPrice"

,DataRowVersion.Current);

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_db.AddInParameter(updateCommand,

"LastUpdate"

,DbType.DateTime,

"LastUpdate"

,DataRowVersion.Current);

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int

rowsAffected = _db.UpdateDataSet(

this

.dsProducts,

"Products"

,

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insertCommand,updateCommand,deleteCommand,UpdateBehavior.Standard);

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}