Class DataConnectionBase

The base class for all data connection components such as .

Inheritance

System.Object

Base

DataComponentBase

DataConnectionBase

CsvDataConnection

JsonDataSourceConnection

XmlDataConnection

Implements

IFRSerializable

IParent

Inherited Members

DataComponentBase.Alias

DataComponentBase.Enabled

DataComponentBase.ReferenceName

DataComponentBase.Reference

DataComponentBase.IsAliased

DataComponentBase.Assign(Base)

DataComponentBase.SetName(String)

DataComponentBase.InitializeComponent()

Base.Name

Base.Restrictions

Base.Flags

Base.Parent

Base.BaseName

Base.ClassName

Base.Report

Base.Page

Base.ChildObjects

Base.AllObjects

Base.ZOrder

Base.IsAncestor

Base.IsDesigning

Base.IsPrinting

Base.IsRunning

Base.OriginalComponent

Base.SetProp(Base, Base)

Base.FloatDiff(Single, Single)

Base.DeserializeSubItems(FRReader)

Base.ExtractDefaultMacros(String)

Base.SetFlags(Flags, Boolean)

Base.SetReport(Report)

Base.SetParent(Base)

Base.SetParentCore(Base)

Base.FindObject(String)

Base.CreateUniqueName()

Base.Clear()

Base.Deserialize(FRReader)

Base.BaseAssign(Base)

Base.AssignAll(Base)

Base.HasParent(Base)

Base.HasFlag(Flags)

Base.HasRestriction(Restrictions)

Base.InvokeEvent(String, Object)

Base.OnAfterLoad()

Base.GetCustomScript()

Base.ExtractMacros()

Base.IsHaveToConvert(Object)

Base.GetConvertedObjects()

Base.ForEachAllConvectedObjects(Object)

Namespace: FastReport.Data

Assembly: FastReport.OpenSource.dll

Syntax

public abstract class DataConnectionBase : DataComponentBase, IFRSerializable, IParent

Examples

This example shows how to add a new MS Access connection to the report.

Report report1;
MsAccessDataConnection conn = new MsAccessDataConnection();
conn.DataSource = @"c:\data.mdb";
report1.Dictionary.Connections.Add(conn);
conn.CreateAllTables();

Constructors

DataConnectionBase()

Initializes a new instance of the DataConnectionBase class with default settings.

Declaration

public DataConnectionBase()

Properties

CommandTimeout

Gets or sets the command timeout, in seconds.

Declaration

public int CommandTimeout { get; set; }

Property Value

Type	Description
System.Int32

ConnectionString

Gets or sets a connection string that contains all connection parameters.

Declaration

public string ConnectionString { get; set; }

Property Value

Type	Description
System.String

Remarks

To modify some parameter of the connection, use respective ConnectionStringBuilder class.

Security note: the connection string may contain a user name/password. This information is stored in a report file. By default, it is crypted using the standard FastReport's password. Since FastReport's source code is available to anyone who paid for it, it may be insecure to use the standard password. For more security, you should use own password. To do this, specify it in the Crypter.DefaultPassword property.

Examples

This example demonstrates how to change a connection string:

OleDbConnectionStringBuilder builder = new OleDbConnectionStringBuilder(oleDbConnection1.ConnectionString);
builder.PersistSecurityInfo = false;
oleDbConnection1.ConnectionString = builder.ToString();

ConnectionStringExpression

Gets or sets an expression that returns a connection string.

Declaration

public string ConnectionStringExpression { get; set; }

Property Value

Type	Description
System.String

Remarks

Use this property to set the connection string dynamically.

The recommended way to do this is to define a report parameter. You can do this in the "Data" window. Once you have defined the parameter, you can use it to pass a value to the connection. Set the ConnectionStringExpression property of the connection object to the report parameter's name (so it will look like [myReportParam]). To pass a value to the report parameter from your application, use the SetParameterValue(String, Object) method.

caution

Once you set value for this property, the ConnectionString property will be ignored when report is run.

DataSet

Gets an internal DataSet object that contains all data tables.

Declaration

public DataSet DataSet { get; }

Property Value

Type	Description
DataSet

IsSqlBased

Gets or sets a value indicates if this connection is SQL-based.

Declaration

public bool IsSqlBased { get; set; }

Property Value

Type	Description
System.Boolean

LoginPrompt

Gets or sets a value indicating whether a login dialog appears immediately before opening a connection.

Declaration

public bool LoginPrompt { get; set; }

Property Value

Type	Description
System.Boolean

Remarks

Set LoginPrompt to true to provide login dialog when establishing a connection. If this property is false (by default), you should provide login information (user name and password) in the ConnectionString property. Though that property is stored in a crypted form, this may be insecure.

Another way to pass login information to the connection is to use ConnectionStringExpression property that is bound to the report parameter. In that case you supply the entire connection string from your application.

Tables

Gets a collection of data tables in this connection.

Declaration

public TableCollection Tables { get; }

Property Value

Type	Description
TableCollection

Remarks

To add a table to the connection, you must either create a new TableDataSource and add it to this collection or call the CreateAllTables() method which will add all tables available in the database.

Methods

AddChild(Base)

Adds a child object to this object's childs.

Declaration

public void AddChild(Base child)

Parameters

Type	Name	Description
Base	child	Object to add.

CanContain(Base)

Gets a value indicating that this object can contain the specified child object.

Declaration

public bool CanContain(Base child)

Parameters

Type	Name	Description
Base	child	Child object.

Returns

Type	Description
System.Boolean	true if this object can contain the specified child object; otherwise, false.

CreateAllTables()

Fills the Tables collection with all tables available in the database.

Declaration

public void CreateAllTables()

Remarks

This method does not read the table data; to do this, call the LoadData(ArrayList) method of each table.

CreateAllTables(Boolean)

Fills the Tables collection with all tables available in the database.

Declaration

public virtual void CreateAllTables(bool initSchema)

Parameters

Type	Name	Description
System.Boolean	initSchema	Set to true to initialize each table's schema.

CreateDataSet()

Initializes a DataSet instance.

Declaration

protected virtual DataSet CreateDataSet()

Returns

Type	Description
DataSet	The DataSet object.

Remarks

This method is used to support FastReport infrastructure. You don't need to use it.

CreateRelations()

Creates the relations between tables. Applies to XmlDataConnection only.

Declaration

public virtual void CreateRelations()

CreateTable(TableDataSource)

Creates table. For internal use only.

Declaration

public virtual void CreateTable(TableDataSource source)

Parameters

Type	Name	Description
TableDataSource	source

DeleteTable(TableDataSource)

Deletes table. For internal use only.

Declaration

public virtual void DeleteTable(TableDataSource source)

Parameters

Type	Name	Description
TableDataSource	source

Dispose(Boolean)

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing

Overrides

Base.Dispose(Boolean)

DisposeConnection(DbConnection)

Disposes a connection.

Declaration

public void DisposeConnection(DbConnection connection)

Parameters

Type	Name	Description
DbConnection	connection	The connection to dispose.

DisposeDataSet()

Disposes a DataSet.

Declaration

protected void DisposeDataSet()

Remarks

This method is used to support FastReport infrastructure. You don't need to use it.

FillTableData(DataTable, String, CommandParameterCollection)

Fills the table data.

Declaration

public virtual void FillTableData(DataTable table, string selectCommand, CommandParameterCollection parameters)

Parameters

Type	Name	Description
DataTable	table	DataTable to fill.
System.String	selectCommand	The SQL select command.
CommandParameterCollection	parameters	SQL parameters.

Remarks

Usually you don't need to use this method. Internally it uses the GetConnection() and GetAdapter(String, DbConnection, CommandParameterCollection) methods to fill the table data. If you create own connection component that does not use nor connection or adapter, then you need to override this method.

FillTableSchema(DataTable, String, CommandParameterCollection)

Fills the table schema.

Declaration

public virtual void FillTableSchema(DataTable table, string selectCommand, CommandParameterCollection parameters)

Parameters

Type	Name	Description
DataTable	table	DataTable to fill.
System.String	selectCommand	The SQL select command.
CommandParameterCollection	parameters	SQL parameters.

Remarks

Usually you don't need to use this method. Internally it uses the GetConnection() and GetAdapter(String, DbConnection, CommandParameterCollection) methods to fill the table schema. If you create own connection component that does not use nor connection or adapter, then you need to override this method.

GetAdapter(String, DbConnection, CommandParameterCollection)

Returns a object that is specific to this connection.

Declaration

public virtual DbDataAdapter GetAdapter(string selectCommand, DbConnection connection, CommandParameterCollection parameters)

Parameters

Type	Name	Description
System.String	selectCommand	The SQL command used to fetch a table data rows.
DbConnection	connection	The connection object.
CommandParameterCollection	parameters	The select command parameters.

Returns

Type	Description
DbDataAdapter	The DbDataAdapter object.

Remarks

You should override this method if you are developing a new connection component. In this method, you need to create the adapter and set its SelectCommand's parameters.

If your connection does not use data adapter, you need to override the FillTableSchema(DataTable, String, CommandParameterCollection) and FillTableData(DataTable, String, CommandParameterCollection) methods instead.

Examples

Here is the example of this method implementation:

public override DbDataAdapter GetAdapter(string selectCommand, DbConnection connection,
  CommandParameterCollection parameters)
{
  OleDbDataAdapter adapter = new OleDbDataAdapter(selectCommand, connection as OleDbConnection);
  foreach (CommandParameter p in parameters)
  {
    OleDbParameter parameter = adapter.SelectCommand.Parameters.Add(p.Name, (OleDbType)p.DataType, p.Size);
    parameter.Value = p.Value;
  }
  return adapter;
}

GetChildObjects(ObjectCollection)

Gets a list of child objects.

Declaration

public void GetChildObjects(ObjectCollection list)

Parameters

Type	Name	Description
ObjectCollection	list	List to fill with values.

GetChildOrder(Base)

Returns z-order of the specified child object.

Declaration

public int GetChildOrder(Base child)

Parameters

Type	Name	Description
Base	child	Child object.

Returns

Type	Description
System.Int32	Z-order of the specified object.

Remarks

This method must return the index of a specified child object in the internal child list.

GetConnection()

Returns a connection object.

Declaration

public DbConnection GetConnection()

Returns

Type	Description
DbConnection	The DbConnection instance.

Remarks

Either creates a new DbConnection instance of type provided by the GetConnectionType() method, or returns the application connection if set in the Config.DesignerSettings.ApplicationConnection.

GetConnectionStringWithLoginInfo(String, String)

Gets a connection string that contains username and password specified.

Declaration

protected virtual string GetConnectionStringWithLoginInfo(string userName, string password)

Parameters

Type	Name	Description
System.String	userName	User name.
System.String	password	Password.

Returns

Type	Description
System.String

Remarks

Override this method to pass login information to the connection. Typical implementation must get the existing ConnectionString, merge specified login information into it and return the new value.

GetConnectionType()

Returns a type of connection.

Declaration

public virtual Type GetConnectionType()

Returns

Type	Description
System.Type	Type instance.

Remarks

You should override this method if you developing a new connection component.

If your connection component does not use data connection, you need to override the FillTableSchema(DataTable, String, CommandParameterCollection) and FillTableData(DataTable, String, CommandParameterCollection) methods instead.

Examples

Here is the example of this method implementation:

public override Type GetConnectionType()
{
  return typeof(OleDbConnection);
}

GetExpressions()

Gets all expressions contained in the object.

Declaration

public override string[] GetExpressions()

Returns

Type	Description
System.String[]	Array of expressions or null if object contains no expressions.

Overrides

Base.GetExpressions()

Remarks

Do not call this method directly. You may override it if you are developing a new component for FastReport.

This method is called by FastReport each time before run a report. FastReport do this to collect all expressions and compile them. For example, GetExpressions method of the TextObject class parses the text and returns all expressions found in the text.

GetParameterType()

Gets the type of parameter that is specific to this connection.

Declaration

public virtual Type GetParameterType()

Returns

Type	Description
System.Type	The parameter's type.

Remarks

This property is used in the report designer to display available data types when you edit the connection parameters. For example, the type of OleDbConnection parameter is a OleDbType.

GetTableNames()

Gets an array of table names available in the database.

Declaration

public virtual string[] GetTableNames()

Returns

Type	Description
System.String[]	An array of strings.

OpenConnection(DbConnection)

Opens a specified connection object.

Declaration

public void OpenConnection(DbConnection connection)

Parameters

Type	Name	Description
DbConnection	connection	Connection to open.

Remarks

Use this method to open a connection returned by the GetConnection() method.

This method displays a login dialog if your connection has the LoginPrompt property set to true. Once you have entered an user name and password in this dialog, it will remeber the entered values and will not used anymore in this report session.

QuoteIdentifier(String, DbConnection)

Quotes the specified DB identifier such as table name or column name.

Declaration

public abstract string QuoteIdentifier(string value, DbConnection connection)

Parameters

Type	Name	Description
System.String	value	Identifier to quote.
DbConnection	connection	The opened DB connection.

Returns

Type	Description
System.String	The quoted identifier.

RemoveChild(Base)

Removes a specified object from this object's childs.

Declaration

public void RemoveChild(Base child)

Parameters

Type	Name	Description
Base	child

Serialize(FRWriter)

Serializes the object.

Declaration

public override void Serialize(FRWriter writer)

Parameters

Type	Name	Description
FRWriter	writer	Writer object.

Overrides

DataComponentBase.Serialize(FRWriter)

Remarks

Do not call this method directly. You should override it if you are developing a new component for FastReport.

This method is called when the object needs to save the state. It may happen when:

• saving the report to the file or stream;
• saving the report to the designer's undo buffer;
• assigning the object to another object using the Assign(Base) or AssignAll(Base) methods;
• saving the object to the designer's clipboard;
• saving the object to the preview (when run a report).

SetChildOrder(Base, Int32)

Sets the z-order of the specified object.

Declaration

public void SetChildOrder(Base child, int order)

Parameters

Type	Name	Description
Base	child	Child object.
System.Int32	order	New Z-order.

Remarks

This method must place the specified child object at the specified position in the internal child list.

SetConnectionString(String)

Sets the connection string.

Declaration

protected virtual void SetConnectionString(string value)

Parameters

Type	Name	Description
System.String	value	New connection string.

Remarks

Use this method if you need to perform some actions when the connection string is set.

UpdateLayout(Single, Single)

Updates the children layout when the size of this object is changed by dx, dy values.

Declaration

public void UpdateLayout(float dx, float dy)

Parameters

Type	Name	Description
System.Single	dx	X delta.
System.Single	dy	Y delta.

Remarks

This method must update positions/sizes of child objects whose Dock or Anchor properties are set to non-default values.

Implements

IFRSerializable

IParent