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Clearly, the goal of write-ahead transaction logging is to provide a method of recording data changes before those changes are affected in memory This is so that in the case of a failure, a recovery process can use these log records in order to reconstruct the database back to its consistent state before the failure occurred In MySQL, this recovery process is run on startup, before any other action that may modify the state of the database Currently, MySQL implements a type of recovery process using the binary log, which contains records for each transaction that modified the data store, regardless of whether those modifications affected transaction-safe storage engines InnoDB implements its own ACID-compliant recovery process as well, in order to ensure the atomicity of transactions run against InnoDB s transaction-safe tables Transaction logging enables a recovery process by supplying what are known as the REDO and the UNDO logs.

Figure 8-14. A bound lookup list The easiest approach to create this example is to begin by using a JOIN query that ensures you retrieve the category information with each product, as with this stored procedure: CREATE PROCEDURE GetProducts AS SELECT * FROM Products INNER JOIN Categories ON Products.CategoryID = Categories.CategoryID GO

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These logs work as follows: REDO log records: Log records belonging to transactions that have a COMMIT mark in the transaction log but do not exist in the data pages in secondary storage are committed to secondary storage during the first part of the recovery process These records, representing data that had been in memory but not flushed to disk, are known as the REDO log records REDO functionality is sometimes called roll-forward recovery UNDO log records: If log records in the log file do not have a COMMIT mark for that transaction in the log, then all data changes that had been made permanent by flushing to disk before the transaction commit had occurred are, in effect, rolled back.

private void btnAddNewProduct_Click(object sender, EventArgs e)

Next, you need to create a record in the StoreDB class that returns a DataSet with two tables one with category information and one with product information. For example, you could create a method like this in the StoreDB class: public DataSet GetCategoriesAndProducts() { string connectionString = Properties.Settings.Default.Store; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProducts", con); cmd.CommandType = CommandType.StoredProcedure; SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds, "Products"); cmd.CommandText = "GetCategories"; adapter.Fill(ds, "Categories"); return ds; } Here s how you can use this method: DataSet ds = Program.StoreDB.GetCategoriesAndProducts(); To allow record navigation, you can bind a unique field like ModelName to a list box: // Connect the product list used for navigation. cboModelName.DataSource = ds.Tables["Products"]; cboModelName.DisplayMember = "ModelName"; To show category information, you have to set up two types of binding both complex binding (to fill the list) and simple binding (to set the selected item). First, you need to set the DataSource so that the list is filled with all the possible categories: // Connect the category list used for editing. cboCategory.DataSource = ds.Tables["Categories"]; cboCategory.DisplayMember = "CategoryName"; cboCategory.ValueMember = "CategoryID"; The trick here is the ValueMember property, with stores the unique CategoryID for each list item, but displays the CategoryName text through the familiar DisplayMember text. Now, you need to use single binding to tie the SelectedValue property to the CategoryID field in the Products table: cboCategory.DataBindings.Add("SelectedValue", ds.Tables["Products"], "CategoryID"); This is the technique that makes the example work. It ensures that every time you navigate to a new record, the list shows the category for that product. It also ensures that if you change the category selection, the product record is updated with a new CategoryID.

... public void Show() { agentChar.Show(null); } public void Hide() { agentChar.Hide(null); } public void Speak(string text) { agentChar.StopAll(null); agentChar.Speak(text, ""); } public void Think(string text) { agentChar.StopAll(null); agentChar.Think(text); } public void MoveTo(short x, short y) { agentChar.MoveTo(x, y, null); } public void GestureAt(short x, short y) { agentChar.GestureAt(x, y); } public void StopAll() { agentChar.StopAll(null); } ... For more-exotic effects, you can use one of the custom animations that the agent supports. You can retrieve the full list from the GetAnimations() method, and you can trigger an animation by name by calling Animate().

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