Precompiler Options
VARCHAR → Purpose Instructs the Pro*C/C++ precompiler to interpret some structs as VARCHAR host variables … . Syntax VARCHAR={NO | YES} Default NO Usage Notes Can be entered only on the command line. When VARCHAR … precompiler as a VARCHAR[n] host variable. VARCHAR can be used in conjunction with the NLS_CHAR
Datatypes
VARCHAR → The VARCHAR datatype stores character strings of varying length. The first two bytes contain the … the string in a bind or a define call must include the two length bytes, so the largest VARCHAR string … that can be received or sent is 65533 bytes long, not 65535. For converting longer strings, use the LONG VARCHAR external datatype.
Precompiler Options
VARCHAR → Purpose The VARCHAR option instructs Pro*COBOL to treat the COBOL group item described in Chapter 5 … , \"Embedded SQL\" as a VARCHAR datatype. Syntax VARCHAR={YES | NO} Default NO Usage Notes Cannot be … entered inline. When VARCHAR=YES, the implicit group item described in Chapter 5, \"Embedded SQL … \" is accepted
Running the Oracle Precompilers
VARCHAR → you want the precompiler to get needed information by connecting to Oracle and accessing the data dictionary, you must also specify USERID. VARCHAR
Datatypes and Host Variables
VARCHAR Variables → string pseudotype called VARCHAR. A VARCHAR variable is a pseudotype that enables you to specify the
Embedded PL/SQL
VARCHAR Variables → When entering a PL/SQL block, Oracle9 i automatically checks the length fields of VARCHAR host
Using Embedded PL/SQL
VARCHAR Pseudotype → ; VARCHAR Pseudotype Recall from Chapter 3, \"Meeting Program Requirements\" that you can use the … VARCHAR pseudotype to declare variable-length character strings. If the VARCHAR is an input host … value stored in the string field. If the VARCHAR is an output host variable, Oracle automatically … sets the length
Embedded PL/SQL
VARCHAR Pseudotype → You can use the VARCHAR datatype to declare variable-length character strings. If the VARCHAR is an … component to the actual length of the value stored in the string component. If the VARCHAR is an output host … variable, Oracle automatically sets the length component. However, to use a VARCHAR (as well as
Writing a Pro*FORTRAN Program
VARCHAR Variables → VARCHAR variables handle character data based on their roles as input or output variables On Input … When you use a VARCHAR variable as an input host variable, your program must assign values to the
Writing a Pro*FORTRAN Program
VARCHAR Variables → When entering a PL/SQL block, Oracle automatically checks the length fields of VARCHAR host
Datatypes and Host Variables
VARCHAR Variables → You can use the VARCHAR pseudotype to declare variable-length character strings. When your program … more convenient to use VARCHAR host variables instead of standard C strings. The datatype name VARCHAR … can be uppercase or lowercase, but it cannot be mixed case. In this Guide, uppercase is used to emphasize that VARCHAR
Datatypes
LONG VARCHAR → The LONG VARCHAR datatype stores data from and into an Oracle LONG column. The first four bytes of … a LONG VARCHAR contain the length of the item. So, the maximum length of a stored item is 2^31-5 bytes.
Meeting Program Requirements
VARCHAR Variables → ; For more information about using host variables, see \"Using Host Variables\". VARCHAR Variables You … can use the VARCHAR pseudotype to declare variable-length character strings. (A pseudotype is a … datatype not native to your host language.) Recall that VARCHAR variables have a 2-byte length field … followed by a string field.
Embedded PL/SQL
VARCHAR Pseudotype → Recall that you can use the VARCHAR pseudotype to declare variable-length character strings. If the … VARCHAR is an input host variable, you must tell Pro*COBOL what length to expect. Therefore, set … the length field to the actual length of the value stored in the string field. If the VARCHAR is an … output host variable, Pro*COBOL
Advanced Topics
VARCHAR Variables and Pointers → The following example shows how VARCHAR host variables are declared: VARCHAR emp_name1[10 … ]; /* VARCHAR variable */ VARCHAR *emp_name2; /* pointer to VARCHAR */ On Input VARCHAR Variables When you use … a VARCHAR variable as an input host variable, your program need
Datatypes and Host Variables
VARCHAR Variable Declaration → Think of a VARCHAR as an extended C type or pre-declared struct. For example, the precompiler … expands the VARCHAR declaration VARCHAR username[20]; into the following struct with array and length … members: struct { unsigned short len; unsigned char arr[20]; } username; The advantage of using VARCHAR … variables
Creating a Logical Standby Database
VARCHAR2 and VARCHAR → NVARCHAR2 NUMBER DATE
Datatypes and Host Variables
VARCHAR Variable Referencing → In SQL statements, you reference VARCHAR variables using the struct name prefixed with a colon, as … the following example shows:... int part_number; VARCHAR part_desc[40];... main() {... EXEC SQL … in part_desc.arr. In C statements, you reference VARCHAR variables using the component names, as the … set the length of the string
Datatypes and Host Variables
Declaring VARCHAR Variables → You define a VARCHAR host variable by adding the keyword VARYING to its declaration, as shown in … definitions that use VARYING. To see how to correctly use PIC N and PIC G in VARCHAR variables, see \"Implicit … VARCHAR Group Items\" The COBOL VARYING phrase is used in PERFORM and SEARCH statements to … example. VARCHAR
Writing a Pro*FORTRAN Program
VARCHAR Host Variables → , the dimension of the host array. VARCHAR Host Variables FORTRAN string datatypes are fixed-length … . However, Pro*FORTRAN lets you declare a variable-length string pseudotype called VARCHAR.
Writing a Pro*FORTRAN Program
Declaring VARCHAR Variables → A VARCHAR is a set of three variables declared using the syntax
Datatypes and Host Variables
Implicit VARCHAR Group Items → Pro*COBOL implicitly recognizes some group items as VARCHAR host variables when the precompiler … option VARCHAR=YES is specified on the command line. For variable-length single-byte character types … must be declared as level 49 for Pro*COBOL to recognize them as VARCHAR host variables. The VARCHAR … =YES command
Native Datatypes
VARCHAR2 and VARCHAR Datatypes → VARCHAR2 and VARCHAR saves on space used by the table. For example, assume you declare a column … VARCHAR Datatype The VARCHAR datatype is synonymous with the VARCHAR2 datatype. To avoid possible changes
Writing a Pro*FORTRAN Program
Referencing VARCHAR Variables → * Declare a VARCHAR. EXEC SQL BEGIN DECLARE SECTION VARCHAR*,, EXEC SQL END DECLARE SECTION where … : n Is the maximum length of the VARCHAR; n must be in the range 1 through 32765. VARNAM Is the name … used to reference the VARCHAR in SQL statements; it is called an aggregate name because it … VARCHAR
Oracle and Informix Dynamic Server Compared
VARCHAR(m,r) → The Informix Dynamic Server VARCHAR datatype stores varying length single-byte and multibyte … case then, when migrating Informix Dynamic Server tables that contain VARCHAR columns consider … considered. For indexes based on VARCHAR columns, Informix Dynamic Server allocates the maximum storage … . Comparison Semantics Informix
Datatypes and Host Variables
Referencing VARCHAR Variables → In SQL statements, you reference a VARCHAR variable using the group name prefixed with a colon, as
Introduction
What is a VARCHAR? → Here is a short description of VARCHARs: VARCHAR Description VARCHAR2 A kind of column in the … \", because it is a possible column type. VARCHAR An Oracle \"external datatype\" (datatype code 9 … ). You use this only if you are doing dynamic SQL Method 4, or datatype equivalencing. VARCHAR[n … ] varchar[n] This
Datatypes and Host Variables
Insert NULLs Using VARCHAR Variables → If you set the length of a VARCHAR variable to zero before performing an UPDATE or INSERT statement
Datatypes and Host Variables
Pass VARCHAR Variables to a Function → functions by reference. The following example shows the correct way to pass a VARCHAR variable to a … function: VARCHAR emp_name[20];... emp_name.len = 20; SELECT ename INTO:emp_name FROM emp WHERE … ) VARCHAR *name; {... printf(\"name is %.*s\\n\", name->len, name->arr);... }
Basic Features
Streaming CHAR, VARCHAR, or RAW Columns → If you use the defineColumnType() Oracle extension to redefine a CHAR, VARCHAR, or RAW column as a … , because these columns are usually short. If you try to get a CHAR, VARCHAR, or RAW column as a data
Datatypes and Host Variables
Return NULLs to a VARCHAR Variable → Oracle automatically sets the length component of a VARCHAR output host variable. If you SELECT or … FETCH a NULL into a VARCHAR, the server does not change the length or array members. Note: If you … select a NULL into a VARCHAR host variable, and there is no associated indicator variable, an ORA
New Features
Implicit Form of VARCHAR Group Items → The declaration of COBOL groups that are recognized as VARCHAR are of the following format: nn 49 … range 1 to 65533. The VARCHAR=YES command line option must be specified for Pro*COBOL to recognize … the extended form of the VARCHAR group items. Otherwise, any declarations in the above format will be … interpreted as regular
Programming with Unicode
Using the VARCHAR Datatype in Pro*C/C++ → The Pro*C/C++ VARCHAR datatype is preprocessed to a struct with a length field and text buffer … field. The following example uses the C/C++ text native datatype and the VARCHAR Pro*C/C++ datatypes to … OPTION (CHAR_MAP=STRING). text ename[20]. /* unsigned short type */ varchar address[50]. /* Pro*C/C … you use the VARCHAR
Datatypes and Host Variables
Find the Length of the VARCHAR Array Component → When the precompiler processes a VARCHAR declaration, the actual length of the array element in the … *C/C++ declaration VARCHAR my_varchar[12]; is expanded by the precompiler to struct my_varchar … () function the length of the data for a VARCHAR host variable or a VARCHAR pointer host variable, and … SQLVarcharGetLength()
JMS Types, 4 of 5
Syntax → DBMS_AQJMS.GET_STRING_PROPERTY( property_name IN VARCHAR, RETURN VARCHAR);
DBMS_LOGSTDBY, 2 of 2
Syntax → DBMS_LOGSTDBY.APPLY_SET ( parameter IN VARCHAR, value IN VARCHAR);
JMS Types, 4 of 5
Syntax → DBMS_AQJMS.GET_USERID( userid OUT VARCHAR);
JMS Types, 4 of 5
Syntax → DBMS_AQJMS.GET_APPID( appid OUT VARCHAR);
DBMS_LOGSTDBY, 2 of 2
Syntax → DBMS_LOGSTDBY.APPLY_UNSET ( parameter IN VARCHAR);