Course outline

Developing Applications Using IBM Informix ESQL/C

Categories: Guaranteed To Run™, IBM

GK IBM LS Partner

Duration: 4 Days

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In this course, you will use IBM Informix ESQL/C tools to write applications that contain embedded SQL commands and queries. You will write applications to perform queries that return single and multiple rows; insert, update, and delete rows; create and use forms to display one or more rows of data; manage cursors, and handle various types of data, including large objects.

This course replaces US Course Developing Applications Using IBM Informix ESQL/C (L1112).

  • Include SQL statements in a C program to add, retrieve, and alter data in an Informix database
  • Set up a cursor structure for manipulating a set of rows
  • Work with all SQL data types
  • Set up and execute dynamically defined SQL statements
  • Write effective, efficient SQL-based applications in C

You should have:

  • IBM Informix Structured Query Language or equivalent knowledge
  • ANSI C programming or C programming experience

This intermediate course is designed for application developers.

Introduction to IBM Informix ESQL/C

  • Identify the components of ESQL/C
  • Install ESQL/C as part of Client SDK
  • Set environment variables and execute the ESQL/C preprocessor

The Demonstration Database

  • The tables in the stores_demo demonstration database
  • The relationships between these tables
  • Installing a copy of this database

Embedding SQL Statements

  • Embed SQL statements in C
  • Identify C variables for use in accessing SQL databases
  • Describe the structure of an ESQL/C program

Using CONNECT TO

  • Use the CONNECT TO, DISCONNECT, and SET CONNECTION SQL statements
  • Describe when optional syntax is appropriate
  • Describe how the syntax works with pre-6.0 version syntax and functionality

Compiling an ESQL/C Program

  • Incorporate other files into your source code
  • Conditionally preprocess SQL statements
  • Compile a program by using IBM Informix ESQL/C
  • Explain the basic use of the make utility

ESQL/C Data Types

  • Determine which C data type to use as a host variable
  • Explain problems in converting between data types
  • Use functions to convert variables of different types

Character and String Data Types

  • Declare host variables for CHAR, CHAR *, VARCHAR, and LVARCHAR data types
  • Explain the storage needs of character and string data
  • Interface with LVARCHAR data through library functions

Numeric Data Types

  • Recognize the storage needs for numeric data
  • Declare host variables for INT8, SERIAL8, BOOLEAN, and DECIMAL data types
  • Describe the structure for the DECIMAL data type
  • Use ESQL/C library functions to access data

Inserting Rows

  • Code an appropriate embedded SQL statement that inserts a row into a database

The SQL Communications Area

  • Explain the need for and the structure of the SQL Communication Area
  • Effectively use information contained in this structure

SQL Exception Testing

  • Describe the kinds of exceptions that might occur during execution of an SQL statement
  • Simplify exception testing after every SQL statement

Using GET DIAGNOSTICS

  • Describe the preferred error detection methods
  • Describe how to obtain warning and error information

Singleton Queries and Lookups

  • Use the SELECT statement to retrieve a row from your database
  • Determine whether SQL NULLs were fetched or character data was truncated
  • Ensure referential integrity using application logic

An Overview of Cursors

  • Name the three types of cursors
  • Use the appropriate cursor for a given task

Using Scroll Cursors

  • Use SQL statements to set up a scrolling cursor
  • Use a scrolling cursor to browse the selected rows
  • Change the size of FETCH and INSERT buffers
  • Automatically free a cursor
  • Use the OPTOFC feature to reduce network messaging

Using Scroll Cursors Effectively

  • Use a scrolling cursor to select a primary key
  • Solve the stale data problem by using the primary key to select the current row
  • Declare a cursor from a prepared statement
  • Defer execution of a PREPAREd statement

Using an Update Cursor

  • Use an update cursor to lock rows that might be updated

Using a Insert Cursor

  • Determine if an INSERT cursor is needed for adding rows to a database
  • Use an INSERT cursor to insert rows into a database

Time Data Types

  • Declare host variables for SQL DATE, DATETIME and INTERVAL data types
  • Explain how data is converted as it is stored
  • Use pre-defined DATETIME and INTERVAL macros

Simple Large Objects

  • Declare host variables for BYTE and TEXT data types
  • Describe the locator structure
  • INSERT and SELECT simple large objects from a file or from memory

Dynamic SQL

  • Use dynamic SQL and the associated data structures and commands

Dynamic SQL: Constructing INSERT Statements

  • Use dynamic SQL to construct insert statements at runtime

Working with the Database Server

  • Explain how to control the database server process with these functions:
    • sqlexit
    • sqldetach
    • sqlbreak
  • Work with multiplexed connections

Agenda
Day 1

  • Welcome
  • Unit 1: Introduction to IBM Informix ESQL/C
  • Exercise 1
  • Unit 2: The Demonstration Database
  • Exercise 2
  • Unit 3: Embedding SQL Statements
  • Exercise 3
  • Unit 4: Using CONNECT TO
  • Exercise 4
  • Unit 5: Compiling an ESQL/C Program
  • Exercise 5
  • Unit 6: ESQL/C Data Types
  • Unit 7: Character and String Data Types
  • Exercise 6
  • Unit 8: Numeric Data Types
  • Exercise 7

Day 2

  • Unit 9: Inserting Rows
  • Exercise 8
  • Unit 10: The SQL Communications Area
  • Exercise 9
  • Unit 11: SQL Exception Testing
  • Exercise 10
  • Unit 12: Using GET DIAGNOSTICS
  • Exercise 11
  • Unit 13: Singleton Queries and Lookups
  • Exercise 12

Day 3

  • Unit 14: An Overview of Cursors
  • Exercise 13
  • Unit 15: Using Scroll Cursors
  • Exercise 14
  • Unit 16: Using Scroll Cursors Effectively
  • Unit 17: Using an Update Cursor
  • Exercise 15
  • Unit 18: Using an Insert Cursor
  • Unit 19: Time Data Types
  • Exercise 16

Day 4

  • Unit 20: Simple Large Objects
  • Exercise 17
  • Unit 21: Dynamic SQL
  • Exercise 18
  • Unit 22: Dynamic SQL: Constructing INSERT Statements
  • Unit 23: Working with the Database Server
  • Exercise 19
This course is delivered by an authorized IBM Global Training Provider.

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