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PART III
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{ lstAddressItemsAdd(new ListItem(addrDRGetString(0)+ " " + addrDRGetString(1), addrDRGetInt32(2)ToString())); } } catch (DataException ex) { ResponseWrite(exToString); } finally { addrDRClose(); addrCNClose(); addrDR = null; addrCom = null; addrCN = null; }
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The project can now be executed by pressing F5 The window shown in Figure 16-13 appears When you select one of the alphabet buttons, the content of the list box changes At present, the same address is used for all names, as you can see if you select some names in the list box We will attend to that next
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Figure 16-13
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The Address Book application
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16: Consuming and Manipulating Data from Data Sources
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Looking Up the Address Info
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The final piece of the AddressBook application to attend to is looking up the address and phone number of a name when the name is selected in the list box When we use two sqlDataReader objects with one connection, as we do in this example, we must close the first one before creating the second Connections can only have one xxxDataReader object defined at one time Follow these steps: 1 Delete the getAddress() method 2 Delete the call to getAddress() in the lstAddress_SelectedIndexChanged() event handler 3 Declare an int variable in lstAddress_SelectedIndexChanged(), and call it intIndex 4 Initialize the intIndex variable to the value from the SelectedItem lstAddress control Use the Int32Parse() method to convert the string into an int This value will be used to retrieve the additional information for the selected name 5 Declare one SqlConnection object, two SqlCommand objects, and two SqlDataReader objects Call them addrCN, addrCom, phoneCom, addrDR, and phoneDR, respectively 6 Declare a string and call it strSQL Initialize strSQL to the connection string for the database: string strSQL = "user id=sa;initial catalog=Address;" + "data source=KENSNABBEN"; 7 Declare a string and call it strCom Initialize the strCom string to the following SQL statement: string strCom = "SELECT Address1, Address2, City, Province, PostalCode, Country from Addresses WHERE NameID = " + intIndex; 8 Declare a string and call it strCom1 Initialize strCom1 to the following SQL statement: string strCom1 = "SELECT PhoneNumber FROM PhoneNumbers WHERE NameID = " + intIndex + " AND Type = 'Home'"; 9 Instantiate the connection using the strSQL string 10 Open the connection inside a try catch finally block 11 Instantiate the addrCom object using the strCom string and the addrCN connection PART III
Recognizing Code 39 Full ASCII In Java
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12 Instantiate the phoneCom object using the strCom1 string and the addrCN connection 13 Create the sqlDataReader by calling the ExecuteReader() method of the addrCom object 14 Call the Read() method of the sqlDataReader 15 Populate the text boxes with the data returned from the sqlDataReader 16 Close the addrDR sqlDataReader 17 Create the sqlDataReader by calling the ExecuteReader() method of the phoneCom object 18 Call the Read() method of the sqlDataReader 19 Populate the phone number text box from the sqlDataReader 20 Close the sqlDataReader The final code for the lstAddress_SelectedIndexChanged() event handler should look like the following code segment
private void lstAddress_SelectedIndexChanged(object sender, SystemEventArgs e) { txtNameText=lstAddressSelectedItemText; int lstIndex = Int32Parse(lstAddressSelectedItemValue); SqlConnection addrCN; SqlCommand addrCom; SqlCommand phoneCom; SqlDataReader addrDR; SqlDataReader phoneDR; string strSQL = "user id=sa;initial catalog=Address;" + "data source=KENSNABBEN\\KEN"; string strCom = "SELECT Address1, Address2, City, Province, PostalCode, Country " + "FROM Addresses WHERE NameID = " + intIndex; string strCom1 = "SELECT PhoneNumber FROM PhoneNumbers WHERE NameID = " + intIndex + "AND Type = 'Home'"; addrCN = new SqlConnection(strSQL); try { addrCNOpen(); addrCom = new SqlCommand(strCom, addrCN); phoneCom = new SqlCommand(strCom1, addrCN); addrDR = addrComExecuteReader(); addrDRRead(); // The data population commands will go here txtAddress1Text = addrDRGetString(0); txtAddress2Text = addrDRGetString(1); txtCityText = addrDRGetString(2); txtProvinceText = addrDRGetString(3);
16: Consuming and Manipulating Data from Data Sources
txtPostalCodeText = addrDRGetString(4); txtCountryText = addrDRGetString(5); addrDRClose(); phoneDR = phoneComExecuteReader(); phoneDRRead(); txtPhoneNumberText = phoneDRGetString(0); phoneDRClose(); } catch (DataException ex) { ResponseWrite(exToString()); } finally { addrCNClose(); phoneDR = null; addrDR = null; addrCom = null; addrCN = null; } }
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