![Creating Datasets Using SQL Structured query: a statement written according to the rules of a language called Structured Query Language (SQL), that uniquely identifies a set of records from one or more tables Basic syntax of an SQL SELECT command (or a structured query) SELECT field(s) FROM table(s) [WHERE condition(s)] [ORDER BY field(s)] 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |](https://image.slidesharecdn.com/bhipemrogramankomputerpertemuan10database-110201052931-phpapp01/85/Pemrograman-komputer-10-database-9-320.jpg)
Pemrograman komputer 10 (database)
- 1. Pemrograman Komputer Pertemuan 10 Database (cont) Bambang Heru Iswanto, Dr.rer.nat M.Si Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 2. Creating a Dataset Dataset: a copy of the data that is retrieved from the database and then inserted into memory To create a dataset: Select the OleDbAdapter control Right-click on the control and select Generate dataset Generate dataset dialog box opens 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 3. Binding Data to Controls Data binding: the process of connecting a control to one or more data elements A data-aware control is capable of automatically displaying data from a field(s) in a dataset Simple binding connects one control to one data element Complex binding is used when more than one data element is bound to a control 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 4. Filling the Dataset The data adapter’s Fill method Used to fill the dataset at run-time DataAdaptername.Fill(DataSetName) 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 5. Navigating through the Dataset BindingContext object manages all of the data bindings for the controls on the form CurrencyManager object provides a simple way to navigate among the rows in a dataset 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 6. Updating a Dataset Changes to data in the dataset do not affect the database unless an explicit operation is executed Via the data adapter, you can make the changes in the dataset and then write the changes back to the data source Initialization code 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 7. Updating a Dataset Adding a record Create an empty row that has the same fields as in the table to be modified Enter data into the fields of the new row Add the new row to the table in the dataset Save the updated table back to the data source 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 8. Updating a Datase Delete a record RemoveAt method Ensure that the user really wants to proceed with the deletion Update method Editing a record Update method Many safeguards are needed 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 9. Creating Datasets Using SQL Structured query: a statement written according to the rules of a language called Structured Query Language (SQL), that uniquely identifies a set of records from one or more tables Basic syntax of an SQL SELECT command (or a structured query) SELECT field(s) FROM table(s) [WHERE condition(s)] [ORDER BY field(s)] 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 10. Creating Datasets Using SQL SELECT clause specifies the field values that will be returned by the query SELECT * specifies that all fields are to be obtained FROM clause specifies the table or tables where records will be searched WHERE clause is used to place any restrictions on the data to be selected ORDER BY clause is used if the selected information is to be presented in a specified order 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 11. DataGrid Control Used to display and modify one or more database tables To create a DataGrid on a form Click on the DataGrid control in the toolbox and then draw it on the Form, or Double-click on the tool and resize it on the Form To associate a DataGrid control with a table in an existing dataset Set the DataSource property to the name of the table 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 12. DataGrid Control DataGrid Control Initially placed on a Form 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 13. Common Programming Errors and Problems Not saving the last edit performed on a dataset Forgetting that changes to the dataset are not automatically reflected in the data source Forgetting to put quotes around the string in a WHERE clause of an SQL statement that is equal to a field Forgetting that the Position property starts at zero and that the first record in a dataset is at position zero, not one 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 14. TERIMA KASIH 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |