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Accessing SQL Data Types

In This Chapter

Type Identifiers

Type Descriptors

Type-Structure Conversion

Data Type Descriptors and Column Type Descriptors

Character Data Types

The mi_char1 and mi_unsigned_char1 Data Types

The mi_char and mi_string Data Types

The mi_lvarchar Data Type

The SQL LVARCHAR Data Type

Character Data in Binary Mode of a Query

Character Data in C UDRs (Server)

External Representation of an Opaque Data Type (Server)

Character Data in a Smart Large Object

Character Processing

Transferring Character Data (Server)

Converting Character Data

Operations on Character Values

Character Type Information

Varying-Length Data Type Structures

Using a Varying-Length Structure

Managing Memory for a Varying-Length Structure

Creating a Varying-Length Structure

Deallocating a Varying-Length Structure

Accessing a Varying-Length Structure

Varying-Length Data and Null Termination

Storage of Varying-Length Data

Information About Varying-Length Data

Byte Data Types

The mi_bitvarying Data Type

Byte Data in a Smart Large Object

Byte Processing

Manipulating Byte Data

Transferring Byte Data (Server)

Boolean Data Types

Boolean Text Representation

Boolean Binary Representation

Pointer Data Types (Server)

Simple Large Objects

The MI_DATUM Data Type

Contents of an MI_DATUM Structure

MI_DATUM in a C UDR (Server)

MI_DATUM in a Client LIBMI Application

Address Calculations with MI_DATUM Values

Uses of MI_DATUM Structures

The NULL Constant

NULL-Valued Pointer

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