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This shows that a 4,000-character string that is really 8,000 bytes long cannot be stored permanently in a VARCHAR2(4000 CHAR) field. It fits in the PL/SQL variable because there a VARCHAR2 is allowed to be up to 32KB in size. However, when it is stored in a table, the hard limit is 4,000 bytes. We can store 2,000 of these characters successfully: ops$tkyte@ORA11UTF> 2 l_data 3 l_ch 4 begin 5 l_data 6 insert 7 end; 8 / declare varchar2(4000 char); varchar2(1 char) := unistr( '\00d6' ); := rpad( l_ch, 2000, l_ch ); into t ( c ) values ( l_data );

PL/SQL procedure successfully completed. ops$tkyte@ORA11UTF> select length( c ), lengthb( c ) 2 from t 3 where c is not null; LENGTH(C) LENGTHB(C) ---------- ---------2000 4000 And as you can see, they consume 4,000 bytes of storage.

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So, of what use are the NVARCHAR2 and NCHAR (for completeness) They are used in systems where the need to manage and store multiple character sets arises. This typically happens in a database where the predominant character set is a single-byte fixed-width one (such as WE8MSWIN1252), but the need arises to maintain and store some multibyte data. There are many systems that have legacy data but need to support multibyte data for some new applications; likewise, there are systems that want the efficiency of a single-byte character set for most operations (string operations on a string that uses fixed-width characters are more efficient than on a string where each character may use a different number of bytes) but need the flexibility of multibyte data at some points. The NVARCHAR2 and NCHAR datatypes support this need. They are generally the same as their VARCHAR2 and CHAR counterparts, with the following exceptions: Their text is stored and managed in the database s national character set, not the default character set. Their lengths are always provided in characters, whereas a CHAR/VARCHAR2 may specify either bytes or characters.

/* Call function with no arguments. This will fail too */ fprintf(stdout, "\nCalling with no arguments.\n"); print_sql_result(db, "select hello_newman()"); /* Done */ sqlite3_close(db); } return 0;

Note The drop-down filter lists are only available when the heading row of the Excel Table is visible.

In Oracle9i and above, the database s national character set may take one of two values: UTF8 or AL16UTF16 (UTF-16 in 9i; AL16UTF16 in 10g). This makes the NCHAR and NVARCHAR types suitable for storing only multibyte data, which is a change from earlier releases of the database (Oracle8i and earlier allowed you to choose any character set for the national character set).

Oracle supports the storage of binary data as well as text. Binary data is not subject to the character set conversions we discussed earlier with regard to the CHAR and VARCHAR2 types. Therefore, binary datatypes are not suitable for storing user-supplied text, but are suitable for storing encrypted information encrypted data is not text, but a binary representation of the original text, word processing documents containing binary markup information, and so on. Any string of bytes that should not be considered by the database to be text (or any other base datatype such as a number, date, and so on) and that should not have character set conversion applied to it should be stored in a binary datatype. Oracle supports three datatypes for storing binary data: The RAW type, which we focus on in this section, is suitable for storing RAW data up to 2,000 bytes in size. The BLOB type, which supports binary data of much larger sizes. We ll defer coverage of this until the LOB Types section later in the chapter. The LONG RAW type, which is supported for backward compatibility and should not be considered for new applications.

This program connects to the database, registers the function, and then calls it three times. The callback function is implemented as follows: void hello_newman(sqlite3_context* ctx, int nargs, sqlite3_value** values) { const char *msg; /* Generate Newman's reply */ msg = sqlite3_mprintf("Hello %s", sqlite3_value_text(values[0])); /* Set the return value. Have sqlite clean up msg w/ sqlite_free(). */ sqlite3_result_text(ctx, msg, strlen(msg), sqlite3_free);

The syntax for the binary RAW type is straightforward: RAW( <size> ) For example, the following code creates a table capable of storing 16 bytes of binary information per row: ops$tkyte@ORA11GR2> create table t ( raw_data raw(16) ); Table created The RAW type is much like the VARCHAR2 type in terms of storage on disk The RAW type is a variable length binary string, meaning that the table T just created, for example, may store anywhere from 0 to 16 bytes of binary data It is not padded out like the CHAR type When dealing with RAW data, you will likely find it being implicitly converted to a VARCHAR2 type that is, many tools, such as SQL*Plus, will not display the RAW data directly but will convert it to a hexadecimal format for display.

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