Help Center/ GaussDB(DWS)/ More Documents/ Tool Guide (Paris Region)/ Data Studio - Integrated Database Development Tool/ Debugging a PL/SQL Function/ Checking Debugging Information
Updated on 2022-07-29 GMT+08:00
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Checking Debugging Information

When you use Data Studio, you can examine debugging information through several debugging panes. This section describes how to check the debugging information:

Operating on Variables

The Variables pane is used to monitor information or evaluate values. The Variables pane can be opened from the minimized window to evaluate or modify variables or parameters in a PL/SQL procedure. As you step through the code, the values of some local variables may be changed.

Press Alt+K to copy the content of the Variables pane.

You can double-click the corresponding line of the variable and manually change its value during runtime.

Click the Variable, Datatype, or Value column in the Variables pane to sort the values. For example, to change the value of the percentage variable from 5 to 15, double-click the corresponding line in the Variable pane. The Set Variable Value dialog box will be displayed, which prompts you to enter the variable value. Input the variable value and click OK.

To set NULL as a variable value, enter NULL or null in the Value column.

If a variable is read-only, will be displayed next to it.

Read-only variables cannot be updated. A variable declared as a constant will not be shown as read-only in the Variables pane. However, an error will be reported when this variable is updated.

  • If 'NULL' or NULL is entered in the Variables pane, the parameter value will be displayed as NULL. This rule also applies to character datatypes.
  • If the value is set to a variable using Data Studio, the value of the variable is the same as the value returned by the statement SELECT EXPRESSION executed using gsql.

Setting/Displaying Variables

Description

Setting a variable to NULL
  1. Double-click a variable value in the Variables pane.

    A dialog box is displayed.

  2. Left the parameter blank.

Setting a string value

Some examples are as follows:

  • To set the value to abc, enter abc.
  • To set the value to Master's Degree, enter Master''s Degree.
  • To set the value as text (NULL), set it to NULL in the Variables pane.

Setting a BOOLEAN value

Enclose the BOOLEAN value t or f within single quotation marks ('). For example, to set t to a BOOLEAN variable, enter 't' in the Value column.

Displaying a variable value

If the variable value is NULL, it will be displayed as NULL.

If the variable value is NULL, it will be displayed as empty.

If the variable value is a string, for example, abc, it will be displayed as abc.

Viewing Results

The Result tab displays the result of the PL/SQL debugging session, with the corresponding procedure name at the top of the tab. The Result tab is automatically displayed only when the result of executing a PL/SQL program exists.

You can click in the Result tab to copy the content of the tab. For details, see Using SQL Terminals.

  • The tool tip in the Result tab displays a maximum of 10 lines, each of which contains up to 80 characters.
  • If the result of an executed query is NULL, it will be displayed as <NULL>.
  • Tab characters (ASCII 009) in table data will not be displayed in the Result, View Table Data, or Properties pane. Tab characters will be included correctly in the copied or exported data, and displayed correctly in the tool tip.