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For instance, assume you defined a field product_price as DECIMAL(9,4) NOT NULL, and populate a data record with the value 99.99: mysql> CREATE TABLE product (id INT NOT NULL, product_price DECIMAL(9,4) NOT NULL); mysql> INSERT INTO product (id, product_price) VALUES (1, 99.99); Next, you go to select the data records where product_price is equal to 99.99: mysql> SELECT * FROM product WHERE product_price = 99.99; Everything works as expected: +----+---------------+ | id | product_price | +----+---------------+ | 1 | 99.9900 | +----+---------------+ 1 row in set (0.00 sec) However, you may be surprised to learn that the following query: mysql> SELECT * FROM product WHERE 100 - product_price = .01; yields different results depending on the data type definition: mysql> SELECT * FROM product WHERE 100 - product_price = .01; +----+---------------+ | id | product_price | +----+---------------+ | 1 | 99.9900 | +----+---------------+ 1 row in set (0.03 sec) mysql> ALTER TABLE product CHANGE COLUMN product_price product_price DOUBLE; Query OK, 1 row affected (0.10 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM product WHERE 100 - product_price = .01; Empty set (0.00 sec) As you can see, the same query produces different results depending on the precision of the data type. The DOUBLE column type cannot be relied on to produce accurate results across all hardware architectures, whereas the DECIMAL type can. But calculations involving DECIMAL data can yield unexpected results due to the underlying architecture s handling of floatingpoint arithmetic. Always test floating-point calculations thoroughly in application code and when upgrading MySQL versions. We have noticed differences in the way precision arithmetic is handled even across minor version changes. See http://dev.mysql.com/doc/mysql/en/ problems-with-float.html for details about floating-point arithmetic issues.

Instead, you need to assign a new font, although you can use the current font as a starting point, and simply change the style or size as needed You can set the selection formatting properties even if there s currently no selected text (in other words, SelectionLength is 0) In this case, the formatting options apply to the current insertion point (wherever SelectionStart is positioned) In other words, if you use the following line of code, when the user starts to type, the text will appear in blue However, if the user first moves to a new location, this formatting selection will be lost richTextBox1SelectionColor = ColorsBlue; You can also use this technique to add formatted text For example, here s the code that adds some text to the end of the text box, using a large font: richTextBox1SelectionStart = richTextBox1TextLength-1; richTextBox1.

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As with all data types, don t go overboard when choosing the length of string fields. Be conservative, especially when deciding on the length of character columns that will be frequently indexed. For those columns that should be indexed because they frequently appear in WHERE conditions, consider using an INDEX prefix to limit the amount of actual string data stored in the index rows. Character fields are frequently used in the storage of address data. When determining how these character columns should be structured, first consider the maximum number of characters that can be stored in the specific data field. For example, if your data set includes only United States zip codes, use a CHAR(5) column type. Don t make the field have a length of 10 just because you may need to store the zip+4 format data for some of the records. Instead, consider having two fields, one CHAR(5) to store the main, non-nullable zip code, and another nullable field for storing the +4 extension. If you are dealing with international postal addresses, investigate the maximum characters needed to store the postal code; usually, a CHAR(8) will do nicely.

{ string _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;"; try { OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); OracleCommand _cmdObj = _connObj.CreateCommand(); _cmdObj.CommandText = "ALTER TABLE PRODUCTS ADD (SPECIALREMARKS VARCHAR2(255))"; _cmdObj.ExecuteNonQuery(); MessageBox.Show("New column added!"); _connObj.Close(); _connObj.Dispose(); _connObj = null; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }

SelectionFont = new Font("Tahoma", 20); richTextBox1SelectedText = "Hi"; Note that if you swapped the first and second line so that you applied the selection formatting before you set the selection position, the formatting would be lost and the new text would have the default formatting (the formatting of the character immediately to the left of the cursor)..

Figure 4-3 shows a simple test program (available with the downloadable examples), that allows the user to style selected section of text using toolbar buttons.

Store spaces that naturally occur in a postal code. The benefit of removing the single space character Tip is almost nonexistent compared to the pain of needing to remove and restore the space for display and storage purposes.

Through ODP.NET s GetSchema() implementation, you can retrieve a rich set of information about the database. You can pass in the name of the desired collection to retrieve a list of the collection objects from the database. Take a look at the sample code in Listing 4-28. Listing 4-28. Retrieving Database Schema Information Using GetSchema()

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