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Pervasive PSQL

  • 4 minutes to read

The Dashboard Designer allows you to connect to different types of SQL databases in the Data Source Wizard. You can also use data access API to connect to the database and select data in code.

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

Important

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

Create a Data Source in the Data Source Wizard

To connect to a Pervasive PSQL database in the Dashboard Designer, follow the steps below:

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

    DataBinding_NewDataSource

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

    DataSourceWizard_PervasivePLSQL

  3. On the next page, specify connection parameters.

    DataSourceWizard_PervasivePLSQL

    • 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 data.

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

    MSSQL_CreateQuery_WithoutStoredProcedures

    Click the Run Query Builder… button to invoke the Query Builder. The Query Builder allows you to choose tables/columns 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 is passed to the Data Source wizard.

    DataSourceWizard_GeneratedQuery_DisabledSP

    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.

    DataSourceWizard_AddQueryParameters

    Click Finish to create the data source.

Create a Data Source in Code

To create a data source that uses a connection to the Pervasive PSQL database, create an instance of the DashboardSqlDataSource class and follow the steps below:

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

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

    Note

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

  2. Create one of the following objects to specify the query:

    • Create a SelectQuery object to specify a set of tables/columns that form a SELECT statement when you execute a query.
    • Create a CustomSqlQuery object to specify an SQL query. Use the CustomSqlQuery.Sql property to specify a custom query string.
    • Create a StoredProcQuery object to execute a stored procedure call and 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:

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);