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xxx sqlite3_value_xxx(sqlite3_value* value); where xxx is the C data type to be returned from the value argument. If you read 6, you may be thinking that these functions have a striking resemblance to the sqlite3_column_xxx() family of functions and you d be right. They work in the same way, even down to the difference between the way scalar and array values are obtained. The functions for obtaining scalar values are as follows: int sqlite3_value_int(sqlite3_value*); sqlite3_int64 sqlite3_value_int64(sqlite3_value*); double sqlite3_value_double(sqlite3_value*); The functions used to obtain array values are as follows: int sqlite3_value_bytes(sqlite3_value*); const void *sqlite3_value_blob(sqlite3_value*); const unsigned char *sqlite3_value_text(sqlite3_value*); The sqlite3_value_bytes() function returns the amount of data in the value buffer for a BLOB. The sqlite3_value_blob() function returns a pointer to that data. Using the size and the pointer, you can then copy out the data. For example, if the first argument in your function was a BLOB and you wanted to make a copy, you would do something like this: int len; void* data; len = sqlite3_value_bytes(values[0]); data = sqlite3_malloc(len); memcpy(data, sqlite3_value_blob(values[0]), len); Just as the sqlite3_column_xxx() functions have sqlite_column_type() to provide the column types, the sqlite3_value_xxx() functions likewise have sqlite3_value_type(), which works in the same way. It is declared as follows: int sqlite3_value_type(sqlite3_value*); This function returns one of the following values, which correspond to SQLite s internal, storage classes (data types), defined as follows: #define #define #define #define #define SQLITE_INTEGER SQLITE_FLOAT SQLITE_TEXT SQLITE_BLOB SQLITE_NULL 1 2 3 4 5

There are four basic character string types in Oracle, namely CHAR, VARCHAR2, NCHAR, and NVARCHAR2. All of the strings are stored in the same format in Oracle. On the database block they will have a leading length field of 1 to 3 bytes followed by the data; when they are NULL they will be represented as a single byte value of 0xFF.

Creating an Excel Table from the Worksheet Data As a final step in preparing the Excel source data, you should format the worksheet data as an Excel Table, to activate special features in the source data, such as the capability to automatically extend formulas as new rows are added to the end of the existing data. Instructions for creating an Excel Table are in Section 1.4.

Note Trailing NULL columns consume 0 bytes of storage in Oracle. This means that if the last column in a table

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is NULL, Oracle stores nothing for it. If the last two columns are both NULL, there will be nothing stored for either of them. But if any column after a NULL column in position is not null, then Oracle will use the null flag, described in this section, to indicate the missing value.

This covers the basic workings of the function/aggregate interface. We can now dive into some examples and practical applications. The Collation interface is so similar that it will be immediately understandable to you now that you ve reviewed the interface for functions and aggregates.

If the length of the string is less than or equal to 250 (0x01 to 0xFA), Oracle will use 1 byte for the length. All strings exceeding 250 bytes in length will have a flag byte of 0xFE followed by 2 bytes that represent the length. So, a VARCHAR2(80) holding the words Hello World might look like Figure 12-1 on a block.

You ve just upgraded from Excel 2003, where you used the Excel List feature to prepare your data for use as pivot table source data. You ve discovered that the List feature is no longer available, and you want to find an equivalent feature in Excel 2007. This problem is based on the sample file named ProductSales.xlsx.

Figure 12-1. Hello World stored in a VARCHAR2(80) A CHAR(80) holding the same data, on the other hand, would look like Figure 12-2.

Figure 12-2. Hello World stored in a CHAR(80) The fact that a CHAR/NCHAR is really nothing more than a VARCHAR2/NVARCHAR2 in disguise makes me of the opinion that there are really only two character string types to ever consider, namely VARCHAR2 and NVARCHAR2. I have never found a use for the CHAR type in any application. Since a CHAR type always blank pads the resulting string out to a fixed width, we discover rapidly that it consumes maximum storage both in the table segment and any index segments. That would be bad enough, but there is another important reason to avoid CHAR/NCHAR types: they create confusion in applications that need to retrieve this information (many cannot find their data after storing it). The reason for this relates to the rules of character string comparison and the strictness with which they are performed. Let s use the 'Hello World' string in a simple table to demonstrate: ops$tkyte@ORA11GR2> create table t 2 ( char_column char(20), 3 varchar2_column varchar2(20) 4 ) 5 / Table created. ops$tkyte@ORA11GR2> insert into t values ( 'Hello World', 'Hello World' ); 1 row created.

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