知识大全 dOOdad提供的数据绑定、特殊函数和事务处理

Posted 2022-07-14 函数

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　　数据绑定 ( )绑定到DataGrid(WebApp)

if(emps LoadAll()) dvEmps = emps DefaultView; dgEmps DataSource = dvEmps; dgEmps DataBind();

　　( )绑定到ComboBox(WinApp)

//get dataemps Query AddResultColumn(Employees ColumnNames EmployeeID);emps Query AddResultColumn(Employees ColumnNames LastName);emps Query AddOrderBy(Employees ColumnNames LastName WhereParameter Dir ASC);emps Query Load();//bind to boboxcmbEmployees DisplayMember = Employees ColumnNames LastName;cmbEmployees ValueMember = Employees ColumnNames EmployeeID;cmbEmployees Datasource = emps DefaultView;

　　( )绑定到DropDownList(WebApp)

//get data emps Query AddResultColumn(Employees ColumnNames EmployeeID); emps Query AddResultColumn(Employees ColumnNames LastName); emps Query AddOrderBy(Employees ColumnNames LastName WhereParameter Dir ASC); emps Query Load(); //bind to drop down list ddlEmployees Datasource = emps DefaultView; ddlEmployees DataTextField = Employees ColumnNames LastName; ddlEmployees DataValueField = Employees ColumnNames EmployeeID; ddlEmployees Databind();

　　特殊函数执行自定义存储过程和SQL语句

　　Examples:（）LoadFromSql:(从数据库中检索并返回检索结果集查询结果保存到DataTable中)

ListDictionary Parms = new ListDictionary();Parms Add( @parameterName value );Parms Add( @parameterName value );parms Add……if(this LoadFromSql( proc_GetSpecialEmployee Parms))

　　（）LoadFromSqlNoExec:(执行无结果集的存储过程返回受影响的行数) int NbrOfChecks = this LoadFromSqlNoExec( proc_CalculatePayroll ); 例如删除一条记录 dOOdad提供的文档中的方法是先LoadByPrimaryKey 再MarkAsDeleted 最后再Save进数据库这个过程要对数据库进行两次操作实际上我们可以只操作一次数据库(直接用dOOdads模板生成的存储过程) 而不用先Load ListDictionary Parms = new ListDictionary(); Parms Add( @ID empID); int effectLine = this LoadFromSqlNoExec( proc_EmployeeDelete Parms);

　　（）LoadFromSqlReader:(返回SqlDataReader) SqlDataReader rdr = this LoadFromSqlReader( proc_GetSpecialEmployee Parms) as SqlDataReader;

　　（）LoadFromSqlScalar:(返回单个值) DateTime EarliestHireDate; ListDictionary Parms = new ListDictionary(); Parms Add( @Active ); EarliestHireDate = Convert ToDateTime(this LoadFromSqlScalar( GetEarliestHireDate Parms));

　　（）LoadFromRawSql: this LoadFromRawSql( SELECT MIN(EM_HireDate) FROM tEmployees

　　WHERE EM_Active = );

　　事务处理:

TransactionMgr tx = TransactionMgr ThreadTransactionMgr();try Employees emps = new Employees(); emps AddNew(); emps FirstName = Jimmy ; emps LastName = Doe ; Products prds = new Products(); prds AddNew(); prds ProductName = Lunch Box ; prds Discontinued = false; tx BeginTransaction(); emps Save(); prds Save(); tx CommitTransaction();catch(Exception ex) tx RollbackTransaction(); TransactionMgr ThreadTransactionMgrReset(); cha138/Article/program/net/201311/13033