public void GenerateProjectToLoadTextFilesToSqlServerDatabase()
{
// Showcases how other C# code and libraries can be used to generate packages
/* The objective is as follows:
* For all the txt files in a folder
* 1. Load each text file into a table
* 2. Before loading trim all string values
*
* We will use the lumenworks.framework.io library to parse a text file and help infer data types
*
* The package design needs to be as follows:
* 1. A package for each file in the folder
* 2. A master package that executes each of the above packages thru a ExecutePackage Task
* 3. In the master package, put all Execute Package Tasks inside a Sequence container, in serial.
*/
// Get files
_fileCollection = Directory.GetFiles(_sourceFolder);
// Delete the ispac if exists; otherwise the code will modify the existing ispac. For clarity in showcasing the demo we will delete the existitng ispac
if (File.Exists(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac"))
{
File.Delete(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac");
}
// create a project
ISProject mainProject = new ISProject(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac", null);
// Add a project connection to the sql server we are loading into
ISOledbConnectionManager oleConn = new ISOledbConnectionManager(@"Provider=SQLNCLI11.1;Auto Translate=False;", "TargetDB", mainProject);
oleConn.ServerName = "localhost";
oleConn.InitialCatalog = "PegasusDemo";
oleConn.UserName = "******";
oleConn.Password = "******";
// Add a Package
ISPackage parentPackage = new ISPackage("ParentPackage", mainProject);
// Add a sequence container; this container will contain the individual data flows for each text file
ISSequence childPackageContainer = new ISSequence("Child Packages", parentPackage);
// Iterate thru our folder and do the following for each file
foreach (string file in _fileCollection)
{
string fileName = Path.GetFileNameWithoutExtension(file);
// use the lumenworks library to get the column names, lenghts, data types etc. This metadata is later used to configure the ssis project
FileHelper fh = new FileHelper(file);
string[] columnNames = fh._columnNames;
int[] columnLengths = fh.InferFlatFileColumnLengths(10);
string[] columnDataTypes = fh.InferFlatColumnSSISDataType();
string[] tableDataTypes = fh.GetSqlServerDataTypes();
// A child package for each file; added to the main project
ISPackage packageForFile = new ISPackage(fileName, mainProject);
// A execute package task in the master package for each file
ISExecutePackageTask ept = new ISExecutePackageTask("Exec " + fileName, childPackageContainer);
ept.UseProjectReference = true;
ept.PackageName = packageForFile.Name; // this execute package task will call the child package
// A connection manager for each file; added to the main project
ISFlatFileConnectionManager fConn = new ISFlatFileConnectionManager(file, fileName, mainProject);
fConn.ColumnNamesInFirstDataRow = true;
//fConn.TextQualifier = "\"";
fConn.Format = "Delimited";
fConn.RowDelimiter = "\r\n"; // check for LF/CRLF if using git
// create a FlatFile column for each column the in the source file
for (int i = 0; i < columnNames.Length; i++)
{
ISFlatFileColumn fc = new ISFlatFileColumn(fConn, columnNames[i], ((i == columnNames.Length - 1) ? true : false));
fc.SetColumnProperties(DtsUtility.StringToEnum <SSISDataType>(columnDataTypes[i]), "Delimited", ",", 0, columnLengths[i], 0, 0);
}
// Add a execute sql task which will create the table in the destiantion server. The file helper class gives the create statement to use
ISExecuteSqlTask createTable = new ISExecuteSqlTask("Create Target Table", packageForFile);
createTable.Connection = oleConn.Name;
createTable.SqlStatementSourceType = SqlStatementSourceType.DirectInput;
createTable.SqlStatementSource = fh.GetCreateStatement();
// Add a data flow for each file
ISDataFlowTask dft = new ISDataFlowTask("Load Data From " + fileName, packageForFile);
dft.DelayValidation = true;
dft.ParentPackage = packageForFile;
dft.ParentProject = mainProject;
// Add a precedence constraint that executes the data flow after the create table sql task is a success
ISPrecedenceConstraint pc1 = new ISPrecedenceConstraint(packageForFile, createTable, dft, PrecedenceEvalOp.Constraint, ExecResult.Success);
// // // Now configure the data flow
// Add a flat file source
ISFlatFileSourceComponent sourceComp = new ISFlatFileSourceComponent(dft, fileName, fConn);
// Add a derive column component that trims a column (in place) if it is of String data type
ISDerivedColumnComponent dCom = new ISDerivedColumnComponent(dft, "Trim Columns", sourceComp);
foreach (ISFlatFileColumn column in fConn.Columns)
{
if (column.DataType == SSISDataType.DT_STR)
{
ISDerivedColumn dCol = new ISDerivedColumn(dCom, DerivedColumnAction.Replace, column.Name);
dCol.Expression = "TRIM(" + column.Name + ")";
}
}
// Add a destination table in the target sql server.
ISOleDbDestinationComponent destination = new ISOleDbDestinationComponent(dft, "Target Table", dCom, dCom.GetOutputNameFromIndex(0));
destination.Connection = oleConn.Name;
destination.OpenRowset = "dbo." + fileName;
// Because, the table may not be available during package generation time, we will manually map the destination columns
// To do that, we will create one ExternalMetadataColumn for each column the source file.
// Becuase we are creating the target table with the same column names, we will directly map on the name
List <ExternalColumnInputMap> externalInputMap = new List <ExternalColumnInputMap>();
for (int i = 0; i < columnNames.Length; i++)
{
SSISDataTypeWithProperty sdt = Converter.TranslateSqlServerDataTypeToSSISDataTypeWithProperty(tableDataTypes[i], columnLengths[i].ToString());
ExternalMetadataColumn externalColumn = new ExternalMetadataColumn();
externalColumn.ExternalColumnName = columnNames[i];
externalColumn.DataType = sdt.DataType;
externalColumn.Length = sdt.Length;
externalColumn.Precision = sdt.Precision;
externalColumn.Scale = sdt.Scale;
externalColumn.CodePage = sdt.CodePage;
externalInputMap.Add(new ExternalColumnInputMap {
ExternalColumn = externalColumn, InputColumnName = columnNames[i]
}); // // Becuase we are creating the target table with the same column names, we will directly map on the name
}
destination.ExternalColumnInputColumnMap = externalInputMap;
// Now perform the manual mapping. Otherwise, SSIS will complain that atleast one column should be mapped.
destination.ManualMapToTargetColumns();
}
mainProject.SaveToDisk();
}
public void ExcelToSqlServerTable()
{
// In this example,we are loading an excel spresheet to a sql server table.
// The excel sheet has three columns named col_a(unicode string 255),col_b (unicode_string 255) and col_c(double precision float)
// The target table has three columns named my_first_col (nvarchar(255)), my_second_col (nvarchar(255)), my_third_col(float(53))
// Load as follows: col_a -> my_first_col; col_b -> my_second_col; col_c -> my_third_col
// <Mapping info that says which excel source column should go to which sql server table column
List <SourceColumnTargetColumnMap> sourceTargetMappings = new List <SourceColumnTargetColumnMap>();
// In this example, I am manullay populating the source to target map.
// Otherwise, this information can be gathered programmatically for both source and target from external config files/mapping tables etc.
// For programmatic translation of other data types to SSIS data types, refer to the code in Converter class in the DtsWrapper library
sourceTargetMappings.Add(new SourceColumnTargetColumnMap
{
SourceColumn = new SourceColumn {
Name = "col_a"
}, // excel source column
TargetColumn = new TargetColumn {
Name = "my_first_col", DataType = SSISDataType.DT_WSTR, Length = 255, CodePage = 0, Precision = 0, Scale = 0
} // target column into which source should go to
});
sourceTargetMappings.Add(new SourceColumnTargetColumnMap
{
SourceColumn = new SourceColumn {
Name = "col_b"
}, // excel source column
TargetColumn = new TargetColumn {
Name = "my_second_col", DataType = SSISDataType.DT_WSTR, Length = 255, CodePage = 0, Precision = 0, Scale = 0
} // target column into which source should go to
});
sourceTargetMappings.Add(new SourceColumnTargetColumnMap
{
SourceColumn = new SourceColumn {
Name = "col_c"
}, // excel source column
TargetColumn = new TargetColumn {
Name = "my_third_col", DataType = SSISDataType.DT_R8, Length = 0, CodePage = 0, Precision = 0, Scale = 0
} // target column into which source should go to
});
// // // Package creation related code
// Delete the ispac if exists; otherwise the code will modify the existing ispac. For clarity in showcasing the demo we will delete the existitng ispac
if (File.Exists(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac"))
{
File.Delete(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac");
}
// create a project
ISProject project = new ISProject(Constants.StorageFoldePath + @"\" + _ispacFileName + ".ispac", null);
// change some project properties
project.Name = "Test";
project.Description = "This project is created from Pegasus.DtsWrapper code";
// Excel Connection Manager
string file = @"C:\Temp\abc.xls";
ISExcelConnectionManager excelConn = new ISExcelConnectionManager("excelConn", project);
excelConn.ExcelFilePath = file;
excelConn.ExcelVersionNumber = ExcelVersion.DTSExcelVer_8;
excelConn.FirstRowHasColumnName = true;
// Target SQL Server Connection Manager
ISOledbConnectionManager oleConn = new ISOledbConnectionManager(@"Provider=SQLNCLI11.1;Auto Translate=False;", "TargetDB", project);
oleConn.ServerName = "192.168.1.107";
oleConn.InitialCatalog = "PegasusDemo";
oleConn.UserName = "******";
oleConn.Password = "******";
// Create a package
ISPackage packageA = new ISPackage("Package_A", project);
packageA.Description = "Package demoing loading an excel file to a sql server table with mappings specified";
packageA.CreatorName = "Me";
// Add a Data Flow
ISDataFlowTask dft = new ISDataFlowTask("ExcelDFT", packageA);
dft.DelayValidation = true;
dft.ParentPackage = packageA;
dft.ParentProject = project;
// // // Configure the data flow
// Add a excel source component
ISExcelSourceComponent es = new ISExcelSourceComponent(dft, "ExSrc", excelConn);
es.OpenRowset = "Sheet1$";
// Add a sql server destination
ISOleDbDestinationComponent dest = new ISOleDbDestinationComponent(dft, "Target Table", es, es.GetOutputNameFromIndex(0));
dest.Connection = oleConn.Name;
dest.OpenRowset = "dbo.ExcelToSqlServer";
for (int i = 0; i < sourceTargetMappings.Count; i++)
{
ExternalMetadataColumn externalColumn = new ExternalMetadataColumn();
externalColumn.ExternalColumnName = sourceTargetMappings[i].TargetColumn.Name; // the name of the column in the target?
externalColumn.DataType = sourceTargetMappings[i].TargetColumn.DataType;
externalColumn.Length = sourceTargetMappings[i].TargetColumn.Length;
externalColumn.Precision = sourceTargetMappings[i].TargetColumn.Precision;
externalColumn.Scale = sourceTargetMappings[i].TargetColumn.Scale;
externalColumn.CodePage = sourceTargetMappings[i].TargetColumn.CodePage;
dest.ExternalColumnInputColumnMap.Add(new ExternalColumnInputMap {
ExternalColumn = externalColumn, InputColumnName = sourceTargetMappings[i].SourceColumn.Name
});
}
// Now perform the manual mapping. Otherwise, SSIS will complain that atleast one column should be mapped.
dest.ManualMapToTargetColumns();
project.SaveToDisk();
}
