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Server Specific Guide

Sybase SQL Anywhere

SQLAPI++ allows to work with a number of SQL database servers. It provides common mechanisms to access database, and as a general rule they work for any database server. But each server has some specific features which a developer has to know in order to leverage server's unique features and avoid potential errors.

This page collects all specific information that concerns working with Sybase SQL Anywhere server using SQLAPI++ Library. Full information about using SQLAPI++ see in How To and Online Documentation.

Available topics:

Connecting to a database

Transaction isolation levels

Working with Long or Lob(CLob, BLob) data

Returning output parameters

Cancelling queries

Connection, command, parameter and field options

Getting native SQLite API

Getting native SQLite connection related handles

Getting native SQLite command related handles

Error handling

Special header files - Compile time

 

Connecting to a database

To connect to a database you should create a connection object and then connect it. A connection object is represented by SAConnection class. After the connection is created you need to connect it to Sybase SQL Anywhere server using SAConnection::Connect method

void Connect( const SAString &sDBString, const SAString &sUserID, const SAString &sPassword, SAClient_t eSAClient = SA_Client_NotSpecified );

with the following parameters:

sDBString.   A string containing a valid SQL Anywhere database connection string.
sUserID.    This parameter isn't used SQLAPI++ with SQLite.
sPassword.   This parameter isn't used SQLAPI++ with SQLite.
eSAClient.    Optional. One of the following values from SAClient_t enum:

  • SA_SQLAnywhere_Client    SQL Anywhere client.
  • SA_Client_NotSpecified     Used by default if eSAClient parameter is omitted.  You can use this default value only if you have call SAConnection::setClient method with SA_SQLAnywhere_Client constant before.

The SQLAPI++ Library requires SQL Anywhere database API library for C/C++.

For more details see How To - Connecting to databases, SAConnection object, SAConnection::Connect.

 

Transaction isolation levels

SQL-92 defines four isolation levels, all of which are supported by SQLAPI++:

  • Read uncommitted (the lowest level where transactions are isolated just enough to ensure that physically corrupt data is not read)
  • Read committed
  • Repeatable read
  • Serializable (the highest level, where transactions are completely isolated from one another)

SQLAPI++ maps different isolation levels on SQL Anywhere server in the following way:

SA_ReadUncommitted = SET TEMPORARY OPTION isolation_level = 0
SA_ReadCommitted = SET TEMPORARY OPTION isolation_level = 1
SA_RepeatableRead = SET TEMPORARY OPTION isolation_level = 2
SA_Serializable = SET TEMPORARY OPTION isolation_level = 3

For more details see SAConnection::setIsolationLevel.

 

Working with Long or Lob(CLob, BLob) data

SQLAPI++ supports four types for working with Long or Lob(CLob, BLob) data:

Name C enum constant
LongBinary SA_dtLongBinary
LongChar SA_dtLongChar
BLob (Binary Large object) SA_dtBLob
CLob (Character Large object) SA_dtCLob

The table below shows how SQLAPI++ data types correspond with servers original data types:

SA_dtLongBinary < = > LONG BINARY
SA_dtLongChar < = > LONG VARCHAR, LONG NVARCHAR
SA_dtBLob  = >  LONG BINARY
SA_dtCLob  =>  LONG VARCHAR, LONG NVARCHAR

For more details see How To - Working with Long or Lob(CLob, BLob) data

 

Returning output parameters

For the moment there is unknown problem with retuning some types of the output parameters.

 

Cancelling queries

Using SACommand::Cancel method you can cancel the following types of processing on a statement:

  • A function running asynchronously on the statement.
  • A function running on the statement on another thread.

SQLAPI++ calls sqlany_cancel function to cancel a query. To get more details see sqlany_cancel function description in SQL Anywhere documentation.

For more details see SACommand::Cancel.

 

Connection, command, parameter and field options

A server specific option can relate to a connection, command,  parameter or field. We recommend you specify each option in an appropriate object, although it is possible to specify them in the parental object as well. In that case the option affects all the child objects.

A connection related option must be specified in a  SAConnection object.

A command related option may be specified in either SAConnection object or SACommand object. If it is specified in SAConnection object it affects all the commands on that connection.

A parameter related option may be specified in SAConnection object, SACommand object or SAParam object. If it is specified in SAConnection object it affects all the commands and therefore all the parameters on that connection. If it is specified in SACommand object it affects all the parameters on that command.

A field related option may be specified in SAConnection object, SACommand object or SAField object. If it is specified in SAConnection object it affects all the commands and therefore all the fields on that connection. If it is specified in SACommand object it affects all the fields on that command.

Specific options for SQL Anywhere:

Option name / Scope 

Description

SQLANY.LIBS

Connection related. Should be specified before the first connection is made.
Forces SQLAPI++ Library to use specified SQL Anywhere client library.

Valid values : Any valid SQL Anywhere client library name list. Names separated by ';' on Windows or ':' on other OS.
Default value: Windows - "dbcapi.dll", Linux -  "libdbcapi.so".

For more details see SAConnection::setOption, SACommand::setOption, SAField::setOption, SAParam::setOption.


Getting native SQL Anywhere API

You can call client specific API functions which are not directly supported by SQLAPI++ Library. SAConnection::NativeAPI method returns a pointer to the set of native API functions available for SQL Anywhere. To use the database API directly you have to downcast this saAPI pointer to the appropriate type and use its implementation-specific members. The following table shows what type cast you have to make and what additional header file you have to include to work with SQL Anywhere API.

Type casting

Additional
include file

Cast the result to class asaAPI:

saAPI *pResult = con.NativeAPI();
asaAPI *p_asaAPI = (asaAPI *)pResult;

#include <asaAPI.h>

To get more information about DBMS API functions see this DBMS specific documentation. 

For more details see SAConnection::NativeAPI.

 

Getting native SQLite connection related handles

You have to use native API handles when you want to call specific SQL Anywhere API functions which are not directly supported by the Library. API functions usually need to receive one or more active handles as a parameter(s). SAConnection::NativeHandles method returns a pointer to the set of native API connection related handles. To use API handles directly you have to downcast saConnectionHandles pointer to the appropriate type and use its implementation-specific members. The following table shows what type cast you have to make and what additional header file you have to include to work with specific SQL Anywhere API.

Type casting

Cast the result to class sl3ConnectionHandles:

#include <asaAPI.h>

saConnectionHandles *pResult = con.NativeHandles();
asaConnectionHandles *p_asaCH =
                                (asaConnectionHandles *)pResult;

Available handles:

  • a_sqlany_connection *pDb;

To get more information about DBMS API functions and handles see this DBMS specific documentation. 

For more details see SAConnection::NativeHandles.

 

Getting native SQL Anywhere command related handles

You have to use native API handles when you want to call specific SQL Anywhere API functions which are not directly supported by the Library. API functions usually need to receive one or more active handles as a parameter(s). SACommand::NativeHandles method returns a pointer to the set of native API command related handles. To use API handles directly you have to downcast saCommandHandles pointer to the appropriate type and use its implementation-specific members. The following table shows what type cast you have to make and what additional header file you have to include to work with specific SQL Anywhere API.

Type casting

Cast the result to class asaCommandHandles:

#include <asaAPI.h>

saCommandHandles *pResult = cmd.NativeHandles();
asaCommandHandles *p_asaCH =
                                (asaCommandHandles *)pResult;

Available handles:

  • a_sqlany_stmt *pStmt;

To get more information about DBMS API functions and handles see this DBMS specific documentation. 

For more details see SACommand::NativeHandles.

 

Error handling

When an error occurs inside SQLAPI++ Library it throws an exception of type SAException. SAException::ErrPos method gets an error position in SQL statement. In SQLite server SAException::ErrPos method returns -1 because SQL Anywhere does not support this function.

For more details see How To - Error handling, SAException object.

 

Special header files - Compile time

The header files are in the include subdirectory of SQLAPI++ distributions:
#include <SQLAPI.h> - main header, should be used whenever SQLAPI++ is used.
#include <asaAPI.h> - SQL Anywhere , should be included if direct libsqlite calls are required.

For more details see Online Documentation - Instructions for Compiling and Linking Applications with SQLAPI++ 

 

Problems and Questions

If you haven't found the answer to you questions or have some problems on using the Library, please, send e-mail to howto@sqlapi.com.