IBM Informix Developer's Handbook - IBM Redbooks

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} 232 IBM Informix Developer’s Handbook wprintf( L"\n%s\t%d\t%ld", (pDBColumnInfo+i)->pwszName, (pDBColumnInfo+i)->wType, (pDBColumnInfo+i)->ulColumnSize); // Free the Column Information Interface CHECK( (hr = pColumnsInfo->Release())) // Cleanup pCommandText->Release(); pCommandText = NULL; pSession->Release(); pSession = NULL; pIDBInitialize -> Uninitialize(); pIDBInitialize -> Release(); pIDBInitialize = NULL; } CoUninitialize(); return(0); Example 7-6 shows the name, type, and length columns of the customer table. Example 7-6 Output of the rowset.cpp sample C:\work>cl /EHsc /nologo rowset.cpp rowset.cpp C:\work>rowset Table : customer Columns :7 Name Type Length customer_num 3 4 customer_type 129 1 customer_name 129 32767 customer_loc 3 4 contact_dates 129 32767 cust_discount 131 19 credit_status 129 1 C:\work> Large objects Large objects (simple and smart) do not require any special handling when using Informix OLE DB Provider. Smart large objects (BLOB and TEXT) support the ADO GetChunk() and AppendChunk() methods.
Example 7-7 demonstrates how to retrieve a CLOB column using the GetChunk() method from the ADO library in C++. This example fetches the first three rows of the catalog table from the sample stores_demo database and displays the data for the catalog_number and advert_descr columns. Example 7-7 The select.cpp sample #include #include #import "c:\program files\common files\system\ado\msado15.dll" rename ("EOF","adoEOF") no_namespace #define CREATEiNSTANCE(sp,riid) { HRESULT _hr =sp .CreateInstance( __uuidof( riid ) ); \ if (FAILED(_hr)) _com_issue_error(_hr); } #define RsITEM(rs,x) rs->Fields->Item[_variant_t(x)]->Value #define UC (char *) struct InitOle { InitOle() { ::CoInitialize(NULL); } ~InitOle() { ::CoUninitialize(); } } _init_InitOle_; void main(){ _RecordsetPtr spRS; _ConnectionPtr spCON; _variant_t varBLOB; long lDataLength = 0; int nrows=3; try{ CREATEiNSTANCE(spCON,Connection); spCON->Provider="ifxoledbc"; spCON->ConnectionString = L"Data Source=stores_demo@demo_on;" L"User ID=informix; Password=password;"; // Connect to the database spCON->Open( "", "", "", -1 ); CREATEiNSTANCE(spRS,Recordset) spRS->PutRefActiveConnection( spCON ); spRS->Open(_bstr_t("catalog"),vtMissing, adOpenForwardOnly, adLockOptimistic,adCmdTable); while( (spRS->adoEOF == false) && nrows>0 ){ nrows--; printf("catalog_num = %s\n", UC _bstr_t(RsITEM(spRS,"catalog_num"))); // Get the size of the large object lDataLength = spRS->Fields->Item["advert_descr"]->ActualSize; Chapter 7. Working with IBM Informix OLE DB Provider 233
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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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Page 202 and 203: 5.6.1 Class not found errors The fo
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Page 206 and 207: 6.1 Hibernate for Java This section
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Page 212 and 213: Example 6-3 shows a hibernate.cfg.x
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Page 216 and 217: Example 6-6 shows the CLASSPATH var
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Page 220 and 221: Example 6-11 shows basic Java code
Page 222 and 223: The only difference between the loa
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Page 226 and 227: Example 6-19 shows the output of th
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Page 238 and 239: 7.3.3 Type mapping Keyword Descript
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Page 242 and 243: Example 7-3 demonstrates how to con
Page 244 and 245: Connect to the Database Server CHEC
Page 246 and 247: #define CHECK(hr) if (((HRESULT)(hr
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Page 270 and 271: 8.1 Informix and .NET data provider
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Page 274 and 275: Example 8-3 shows how to compile an
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Page 284 and 285: Table 8-9 lists the methods that th
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Page 290 and 291: Example 8-16 shows the output of Ex
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IfxConnection conn; IfxClob vclob;
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Property Type Description Year Int3
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Hour : 8 Minute: 20 C:\work>c Arith
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Method Description Compare(IfxDec1,
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C:\work>decimal Value Sales Tax : 0
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Ceiling Sales Tax : 1.0 Negative Sa
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Visual Studio Add-In provides tools
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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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