IBM Informix Developer's Handbook - IBM Redbooks

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happen that the 32-bit provider is registered as a 64-bit provider (or vice versa) and the Windows operating system will fail to find and load the provider. You can verify that the provider library is registered correctly by examining the Windows registry. Example 7-20 shows the registry entry for 32-bit and 64-bit Informix OLE DB Provider. Remember that the name of the Informix provider is ifxoledbc. Example 7-20 Informix OLE DB registry keys C:\work>c:\windows\syswow64\reg query "HKEY_CLASSES_ROOT\CLSID\{A6D00422-FD6C-11D0-8043-00A0C90F1C59}\InprocServer32" HKEY_CLASSES_ROOT\CLSID\{A6D00422-FD6C-11D0-8043-00A0C90F1C59}\InprocServer32 (Default) REG_SZ C:\Program Files (x86)\IBM\Informix\Client-SDK\bin\ifxoledbc.dll ThreadingModel REG_SZ Both C:\work>c:\windows\system32\reg query "HKEY_CLASSES_ROOT\CLSID\{A6D00422-FD6C-11D0-8043-00A0C90F1C59}\InprocServer32" HKEY_CLASSES_ROOT\CLSID\{A6D00422-FD6C-11D0-8043-00A0C90F1C59}\InprocServer32 (Default) REG_SZ C:\Program Files\IBM\Informix\Client-SDK\bin\ifxoledbc.dll ThreadingModel REG_SZ Both C:\work> Failed to load the Ifxoledbc.dll Here, we explain the reason and the solution for a “Failed to load the Ifxoledbc.dll” error. Reason The application fails to load Informix OLE DB Provider or one of its libraries. Solution The value of INFORMIXDIR (as a environment variable or in the registry) should be the directory where Client SDK is installed. Ensure that the environment variable PATH contains the %INFORMIXDIR%\bin directory. For example: PATH=C:\Program Files\IBM\Informix\Client-SDK\bin;%PATH% When an application loads Informix OLE DB Provider, Client SDK libraries that the provider needs for communication and registry access are loaded from the directory that is used in the registration process. 246 IBM Informix Developer’s Handbook
On 64-bit version of Windows operating system, ensure that the PATH and INFORMIXDIR variables are set correctly for all users. Some applications, such as SQL Server, are executed under credentials that are different than the logged user and that can have different settings for this variables. Failed to connect to the database Here, we explain the reason and the solution for a “Failed to connect to the database” error. Reason The most common reason for this type of error is due to invalid parameters in the connection string or invalid connectivity information. Solution If the application is getting an Informix OLE DB error, it has managed to load Informix OLE DB Provider, but it is failing during connection. For any connection error, always ensure that the basic connectivity works. Testing whether the client system has access to the database using the iLogin utility can help to narrow the problem. If iLogin fails, verify that the connection parameters for the database (server name, port number, host name, and so on) are correct. Use the setnet32.exe utility to verify that the information stored in the registry is valid. The user credentials (user ID and password) can also be set in the registry using the setnet32.exe utility. Verify that both the user ID and password are valid. The majority of the connection string parameters must be included exactly as they appear in Table 7-4 on page 221. Invalid parameters are ignored and can cause an error connection. See Table 7-7 for examples of valid parameters. Table 7-7 Valid parameters Valid Invalid Data Source DataSource, DSN User ID UserID, UID Password PWD If you are using GLS variables (Client_Locale or Db_locale), make sure that they are set correctly. If you do not use UNICODE, the code set part of Client_Locale should be the same as your operating system. Db_Locale should be your database locale. Chapter 7. Working with IBM Informix OLE DB Provider 247
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IBM Informix Developer’s Handbook
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Note: Before using this information
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3.2 Setup and configuration . . . .
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8.3.1 Connecting to the database .
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12.5.2 Compiling the wrapper code .
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Trademarks IBM, the IBM logo, and i
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Krishna Doddi (also known as Prasad
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Comments welcome Your comments are
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1.1 Server options There are a numb
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This edition offers the following a
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either an HDR secondary or RSS seco
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There are three edition options for
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functions. An application calls the
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The IBM Data Server Driver for JDBC
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OLEDB Microsoft OLE DB is a specifi
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The DataBlade Developers Kit provid
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1.3.1 Architecture overview An unde
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Physical and logical logging As eac
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Before you select an API or library
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Hidden, behind-the- scenes tasking
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2.1 Server setup In this section, w
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A typical sqlhosts file contains th
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Figure 2-1 shows the Server Informa
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with the existing Informix instance
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2.2 Client setup ► Edit the Infor
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Figure 2-4 illustrates the options
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2. Prepare the environment. You nee
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5. If you selected a Custom install
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At this stage, the Client SDK insta
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You can download some of these comp
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46 IBM Informix Developer’s Handb
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2. On the Software License Agreemen
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5. Verify the installation selectio
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3. Extract the IBM Data Server Driv
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For a silent installation on both W
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Configuring the JDBC driver To use
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3.1 ODBC and Informix ODBC is a sof
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► IBM Informix ODBC Driver (64-bi
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You can set optional configuration
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Parameter Description Insert Cursor
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Table 3-5 shows the ODBC libraries
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Keyword Description DriverODBCVer S
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Keyword Description DESCRIBEDECIMAL
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If there is no database alias defin
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Example 3-5 shows a simple db2cli.i
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The application sends SQL request t
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} 78 IBM Informix Developer’s Han
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SQLSMALLINT DecimalDigits, /* ibSca
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If your application requires only S
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} SQLCHAR sname[15+1]; SQLLEN lcode
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fprintf (stdout, "Connected\n"); 88
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SQLAllocHandle (SQL_HANDLE_ENV, SQL
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SQLAllocHandle (SQL_HANDLE_ENV, SQL
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contains the data or special attrib
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Function Description ifx_lo_specset
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SQLSMALLINT lospec_size; SQLINTEGER
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4. Call ifx_lo_open() to open the s
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SQLBindParameter (hstmt, 1, SQL_PAR
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} SQLFreeHandle (SQL_HANDLE_ENV, he
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SQLCHAR*insertStmt = (SQLCHAR *) "I
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Accessing a complex data type Examp
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C:\work> 3.3.5 Error handling Ludwi
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C:\work>connect_error demo_on;UID=w
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We create a function called CheckDi
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Figure 3-14 shows the Tracing tab.
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Example 3-36 demonstrates how to se
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DRDADEBUG All IBM Data Server drive
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124 IBM Informix Developer’s Hand
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4.1 Informix ESQL/C Informix ESQL/C
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Example 4-1 shows a simple sqlhosts
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Compiling ESQL/C programs The esql
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Platform Environment variable Linux
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Example 4-3 shows a statement that
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:fname[i], :lname[i], :company[i],
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The SELECT statement shown in Examp
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EXEC SQL fetch ex_cursor into :n1,:
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Table 4-3 lists a few ESQL/C data t
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the sbspace in the server before yo
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Example 4-10 shows the ESQL/C comma
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Example 4-12 shows the output of Ex
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} EXEC SQL END DECLARE SECTION; 150
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C->S (16) Time: 2010-07-06 20:21:58
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5.1 JDBC drivers for an Informix da
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5.1.2 IBM Data Server Driver for JD
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Example 5-4 shows the CLASSPATH env
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Example 5-6 shows the compile line
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programmer uses Java data types to
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Example 5-9 shows the syntax of the
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" Connected to Informix Dynamic Ser
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5.4.2 Manipulating data In this sec
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conn.close(); } catch ( Exception e
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Example 5-15 demonstrates how to di
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conn = DriverManager.getConnection(
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con.setAutoCommit(false); Statement
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System.out.format("Last row: \t%d,"
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PreparedStatement pstmt=conn.prepar
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System.err.println(e); } } } Exampl
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Issuer: CN=bedfont.uk.ibm.com, O=ib
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5.6.1 Class not found errors The fo
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5.7.2 IBM Data Server Driver for JD
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6.1 Hibernate for Java This section
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A Hibernate application includes th
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6.2.2 Configuration File Descriptio
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Page 220 and 221: Example 6-11 shows basic Java code
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Page 226 and 227: Example 6-19 shows the output of th
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Page 242 and 243: Example 7-3 demonstrates how to con
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Page 270 and 271: 8.1 Informix and .NET data provider
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Page 284 and 285: Table 8-9 lists the methods that th
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Page 304 and 305: Method Description Compare(IfxDec1,
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9.1 Informix and PHP extensions The
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- Console mode Enter one of the fol
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9.2.4 Verifying connectivity You ca
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► Secure Although PHP is open sou
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*--- persistent connect trusted use
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In a web application, the input dat
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Dynamic SQL statements Dynamic SQL
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$stmt->bindValue(':p9', $_POST["pho
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*--- Verification ---*/ $stmt1=$dbc
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$row=$stmt1->fetch(PDO::FETCH_ASSOC
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} /*--- Get the BLOB from the datab
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In Example 9-17 on page 316, the da
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Function Description db2_bind_param
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The IBM_DB2 extension This PHP exte
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9.3.5 Exception handling Error hand
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The error information that is gener
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9.3.6 Troubleshooting printf("NonCr
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10.1 An overview of UDRs and databa
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10.1.2 About UDRs specific examples
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Invoking a UDR You can invoke a UDR
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10.2 Developing UDRs To develop a U
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One variable in, one result out For
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10.2.2 UDRs in Java 5 1005 6 1006 7
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Note: The paths for .jar files that
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We use the following procedure to c
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For our example, JVPCLASSPATH is se
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10.2.3 UDRs in C and break somethin
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3. Set the bld file permissions as
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4. Create the function in dbaccess.
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Installing the DataBlade Any DataBl
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To connect to a database, run one o
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IBM Informix DataBlade module name
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interface, called BladeSmith, allow
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11.1 A brief overview of Ruby on Ra
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The following drivers allow Ruby to
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Data types The Ruby Informix driver
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03/07/2010 17:30 1,088 LICENSE 03/0
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The Rails Adapter can be installed
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server: demo_on username: informix
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Using Ruby Informix driver In this
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If the SQL statement returns only o
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Example 11-17 shows how to select a
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Example 11-19 shows a simple Ruby s
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# create a prepare object stmt = IB
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11.4 Using the Rails Adapter with R
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For more information, refer to: htt
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Figure 11-1 shows the Listing items
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11.5.1 Creating the Rails applicati
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11.5.4 Migrating the model Ruby on
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11.5.5 Starting the Rails web serve
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12.1 Basic concepts In this section
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A web service can perform the follo
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Example 12-1 shows a typical shell
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12.3.2 The w4gl utility For additio
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Parameter Description ws_func Funct
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In the remaining sections, we descr
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Example 12-8 shows the APP SERVER f
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Add details about the web service Y
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Source file information Finally, yo
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The Generate operation creates the
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process, running each individual st
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The compressed file is left in the
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Figure 12-3 shows the WSDL informat
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| Target Directory [/work/publish ]
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After this process is complete, the
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while using one of the I4GL web ser
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Keeping the wrapper C files in the
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12.6.2 Tracing A developer can use
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13.1 Concurrency and locking 13.1.1
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13.1.2 Lock duration The length of
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If a table is not created with row
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How the database server manages byt
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13.2.1 Deadlocks reader can read a
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ow that has not been committed (thi
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should check with the DBA to determ
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Note: For information about writing
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The amount of memory storage per lo
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The DIRECTIVES parameter The DIRECT
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13.5 Working with your database adm
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► Metadata updates affect logging
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Guidelines for setting VPCLASS: ►
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The lock level is determined by the
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area of specific interest. The func
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B.1 Distributed transactions A tran
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* Compile with: * on UNIX systems:
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} { printf("XA_PREPARE failed with
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When using distributed transactions
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Online resources ► IBM Informix D
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cast function 332 cast support func
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IfxDecimal public method 287 ifxdot
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jvpjavavm 341 jvplog 347 jvplogfile
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sql_longvarbinary 80, 96 sql_longva
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IBM Informix Developer’s Handbook
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