Shell

The script in the editor can be executed by clicking the ▶ icon in the upper left corner or pressing Ctrl+E. Select a part (or all) of the script, and click ▶ or press Ctrl+E to execute the selected script. If no script is selected, clicking ▶ will execute the entire script. You can also click a line and press Ctrl+E to execute only this line of script.

a = array(STRING,10).append!(string(concat(take(`abcdefg01234,100005))))
print a

The variable browser in the web interface displays the name, data type, and size of variables in each data form.

It is very similar to that in GUI. Their only difference is that you can right click variables in GUI to conduct operations such as undefine, check schema, etc, while the web interface doesn't offer these functionalities.

Select a vector, matrix, or in-memory table in the variable browser to view the data. For a DFS table, you can check the data in the database browser.

The data browser in the web interface displays the execution results of the script in the editor.

For example, execute the following script in the editor window:

sym = `C`MS`BAC`BK`WFC
price= 75.67 53.24 29.48 54.42 60.92
qty = 2200 1900 2100 3200 1800
t = table(sym, qty, price)
select *, price*qty as volume from t

It is very similar to that in GUI except for the following differences:

• In the GUI, you can right-click in the data browser to perform various operations such as copying, sorting, and exporting. In the web interface, you can copy text by selecting it, but sorting data isn't supported. To view results in a new window, click the "Open in new window" icon in the lower left corner. If you need to export data, click the "export CSV" icon.

  • 

• To set decimal places of results displayed in data browser, you can click the "Settings" icon in the upper right corner.

  

The log browser displays the completion time, elapsed time, execution results in scalar form, and error information of each execution.

Execution results in scalar form will be displayed in the log browser. Results in other forms will be displayed in the data browser.

In the following example, the result of 2 + 3, as a scalar, is displayed in the log browser. The result of 2 + [1, 2, 3], as a vector, is displayed in the data browser

The database browser features the following functionalities:

• Create databases and tables;

• Add columns (with comments) to a table;

• Display information about the created databases and their tables.

In the DolphinDB web interface, users can create databases or tables by conditions or scripts.

1. Create databases and tables by conditions

   • Create databases

   Click the icon to open the Create database window.

   

   Click Clear to clear the filled content or Cancel to cancel the creation.

   Click Preview to view the corresponding script:

   

   Click Cancel to cancel the creation or Go Back to return to the Create database window page. Click Execute and the database is shown in the database browser if the script is correct, otherwise an error message is returned.

   • Create tables

   Hover over the database name in the browser and you can see the icon on the right.

   

   Click the icon to open the Create table window:

   

   Fill the required fields and click Next to view the corresponding script:

   

   Click the icon in the upper right corner to copy the script.

   Click Go Back to return to the Create table window or Execute to create the table. If the table is created successfully, the following message is shown:

   

   Otherwise, the error message is displayed:

   

2. Create databases and tables by scripts

   You can also create databases and tables directly by entering the corresponding script in the editor. After successful creation, click the 🔁 icon in the upper left corner of database browser to view the database/table.

   Example: execute the following script in the editor to create a DFS table pt.

   dbName="dfs://test_topic_partition"
   if(existsDatabase(dbName)){
       dropDatabase(dbName)
   }
   db=database(dbName,VALUE,2012.01.01..2012.01.10)
   n=20
   date=rand(2012.01.01..2012.01.10, n)
   sym=rand("A"+string(1..30), n)
   qty=rand(100, n)
   t=table(date, sym, qty)
   pt=db.createPartitionedTable(t, `pt, `date).append!(t)

   Click the ➕ icon before the table name to show the table schema, column names and types, and partitions. Click the ➖ icon to collapse the displayed information.

   

   Click table pt and the table is displayed in the data browser:

   

   Hover over the columns and you can see the icon. Click the icon to add a new column:

   

   Hover over a column of pt and you can see the icon. Click the icon to add comments to the column:

   

   Click the schema of pt and the table schema is displayed in the data browser:

   

   Click partitions, select a partition, and the data of the partition is displayed in the data browser: