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tWaitForSqlData Standard properties

These properties are used to configure tWaitForSqlData running in the Standard Job framework.

The Standard tWaitForSqlData component belongs to the Orchestration family.

The component in this framework is available in all Talend products.

Basic settings

Wait at each iteration (in seconds)

Set the time interval in seconds between each check for the sql data.

Max. iterations (infinite if empty)

Number of checks for sql data before the Jobs times out.

Use an existing connection/Component List

A connection needs to be open to allow the loop to check for sql data on the defined DB.

When a Job contains the parent Job and the child Job, Component list presents only the connection components in the same Job level, so if you need to use an existing connection from the other level, you can

From the available database connection component in the level where the current component is, select the Use or register a shared DB connection check box. For more information about this check box, see tMysqlConnection for the connection components according to the database you are using.

Otherwise, still in the level of the current component, deactivate the connection components and use Dynamic settings of the component to specify the intended connection manually. In this case, make sure the connection name is unique and distinctive all over through the two Job levels. For more information about Dynamic settings, see Dynamic settings tab of components in a Job.

Table to scan

Name of the table to be checked for insert or deletion

Trigger action when rowcount is

Select the condition to be met for the action to be carried out:

Equal to Not Equal to Greater than Lower than Greater or equal to Lower or equal to


Define the value to take into account.


Select the action to be carried out: either stop the iterations when the condition is met (exit loop) or continue the loop until the end of the max iteration number (continue loop).

Advanced settings

Enable WHERE clause Select this check box to select specific rows from the table.
Enable sql statement Select this check box to execute a SQL statement against the table.
tStatCatcher Statistics Select this check box to gather the Job processing metadata at a Job level as well as at each component level.

Global Variables

Global Variables

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

CURRENT_ITERATION: the sequence number of the current iteration. This is a Flow variable and it returns an integer.

ROW_COUNT: the number of rows detected in the table. This is a Flow variable and it returns an integer.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl+Space to access the variable list and choose the variable to use from it.

For more information about variables, see Using contexts and variables.


Usage rule

Although this component requires a Connection component to open the DB access, it plays also the role of the start (or trigger) component of the subJob which gets executed under the condition described. Therefore this component requires a subJob to be connected to via an Iterate link.

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