Pervasive PSQL

• Aug 03, 2020
• 4 minutes to read

The Dashboard Designer provides the capability to connect to multiple types of SQL databases using the Data Source wizard. You can also use the data access API to connect to the database and select the required data in code.

This tutorial describes how to establish a connection to a Pervasive PSQL database and select the required data.

• Creating a Data Source in the Data Source Wizard
• Creating a Data Source in Code

Important

The appropriate data provider must be installed on the client machine. For information on data providers, refer to the Supported Data Sources article.

Creating a Data Source in the Data Source Wizard

To connect to the Pervasive PSQL database in the Dashboard Designer, perform the following steps.

1. Click the New Data Source button in the Data Source ribbon tab.

   

2. On the first page of the invoked Data Source Wizard dialog, select Database and click Next.

   

3. On the next page, select the Pervasive PSQL data provider and specify the required connection parameters.

   

   • Server name

     Specifies the name of the Pervasive PSQL database server to which the connection should be established.

   • User name

     Specifies the user name used to authenticate to the Pervasive PSQL database server.

   • Password

     Specifies the password used to authenticate to the Pervasive PSQL database server.

   • Database

     Specifies the name of the database that contains the required data.

4. After you have specified the required connection parameters, click Next and specify how to select data from the database.

   

   Run the Query Builder by clicking the Run Query Builder… button. The Query Builder allows you to choose the required tables/columns visually and passes the resulting SQL query to the SQL String editor. After you constructed the query in the Query Builder, the text of the generated query will be passed to the Data Source wizard.

   

   Click Finish to create the data source.

   Note

   If you applied filtering to this query and created the query parameter, you can click Next to specify the settings of the query parameter.

5. On the last page, you can optionally add query parameters and preview data.

   

   Click Finish to create the data source.

Creating a Data Source in Code

To create a data source that uses a connection to the Pervasive PSQL database, create the instance of the DashboardSqlDataSource class and perform the following steps.

1. Specify connection parameters to the Pervasive PSQL database. Create the PervasiveSqlConnectionParameters class object and specify the following properties.

   • Use the SqlServerConnectionParametersBase.ServerName property to specify the name of the server to which the connection should be established.
   • Use the SqlServerConnectionParametersBase.DatabaseName property to specify the name of the database to which the connection should be established.
   • Specify user credentials using the SqlServerConnectionParametersBase.UserName and SqlServerConnectionParametersBase.Password properties.

   Assign the resulting PervasiveSqlConnectionParameters object to the SqlDataSource.ConnectionParameters property.

   Note

   As an alternative, you can add a connection string with required parameters to the application configuration file. Then, assign the connection string name to the SqlDataSource.ConnectionName property.

2. Select the required data by specifying the query. You can do this in the following ways.

   • The SelectQuery object allows you to specify a set of tables/columns, which form a SELECT statement when executing a query.
   • The CustomSqlQuery object allows you to specify an SQL query manually.
   • The StoredProcQuery object allows you to perform a stored procedure call to supply the dashboard with data.

   Add the created query to the SqlDataSource.Queries collection exposed by the DashboardSqlDataSource object.

3. Add the created DashboardSqlDataSource object to the Dashboard.DataSources collection.

The following code snippet shows how to supply the dashboard with data from the Northwind database deployed on the Pervasive PSQL server.

C#

using DevExpress.DashboardCommon;
using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
// ...
            PervasiveSqlConnectionParameters pervasiveParams = new PervasiveSqlConnectionParameters();
            pervasiveParams.ServerName = "localhost";
            pervasiveParams.DatabaseName = "Northwind";
            pervasiveParams.UserName = "Admin";
            pervasiveParams.Password = "password";            

            DashboardSqlDataSource sqlDataSource = new DashboardSqlDataSource("Data Source 1", pervasiveParams);
            SelectQuery selectQuery = SelectQueryFluentBuilder
                .AddTable("SalesPerson")
                .SelectColumns("CategoryName", "Extended Price")
                .Build("Query 1");
            sqlDataSource.Queries.Add(selectQuery);
            sqlDataSource.Fill();
            dashboard.DataSources.Add(sqlDataSource);

VB.NET

Imports DevExpress.DashboardCommon
Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
' ...
            Dim pervasiveParams As New PervasiveSqlConnectionParameters()
            pervasiveParams.ServerName = "localhost"
            pervasiveParams.DatabaseName = "Northwind"
            pervasiveParams.UserName = "Admin"
            pervasiveParams.Password = "password"

            Dim sqlDataSource As New DashboardSqlDataSource("Data Source 1", pervasiveParams)
            Dim query As SelectQuery = SelectQueryFluentBuilder _ 
                .AddTable("SalesPerson") _ 
                .SelectColumns("CategoryName", "Extended Price") _
                .Build("Query 1")
            sqlDataSource.Queries.Add(selectQuery)
            sqlDataSource.Fill()
            dashboard.DataSources.Add(sqlDataSource)