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Snap type:

Read

Description:

The Teradata Select Snap allows you to fetch data from an Teradata database by providing a table name and configuring the connection. The Snap produces the records from the database on its output view which can then be processed by a downstream Snap.

JSON paths can be used in a query and will have values from an incoming document substituted into the query. However, documents missing values for a given JSON path will be written to the Snap's error view. After a query is executed, the query's results are merged into the incoming document overwriting any existing keys' values. The original document is output if there are no results from the query.

Queries produced by the Snap have the format:

SELECT TOP [limit] * FROM [table] WHERE [where clause] ORDER BY [ordering]

If more powerful functionality is desired, then the Execute Snap should be used.

Expected upstream Snaps: A dynamic where clause can be defined by providing values upstream. Such as the Mapper Snap can provide constants, pipeline parameters mapped into variables which then can be used in the where clause or even in the table/schema properties.
Expected downstream Snaps: The Snap will output one document for every record retrieved, hence any document processing snap can be used down stream.
Expected input: Document that provides values for one or more properties of the snap or simply for pass through purpose.
Expected output: Document for each record retrieved.

The where clause can only use variables, no constants or pipeline parameters.
A good example for a where clause is: SALARY =$SALARY (here we use the SALARY variable of the input document)
A bad example for a where clause is: SALARY = _param (this will not work since we do not evaluate pipeline parameters during prepared statement execution, instead an upstream mapper needs to be used that maps _param into $SALARY)

Prerequisites:

[None]

Support and limitations:

Works in Ultra Task Pipelines.

Account:

This Snap uses account references created on the Accounts page of SnapLogic Manager to handle access to this endpoint. See Configuring Teradata Database Accounts for information on setting up this type of account.

Views:

Input	This Snap has one output view by default and produces one Document for each record in the table. A second view can be added to dump out the metadata for the table as a Document.
Output	This Snap has at most one error view and produces zero or more Document(s) in the view.
Error	This Snap has at most one error view and produces zero or more Document(s) in the view.

Settings

Label

Required. The name for the Snap. You can modify this to be more specific, especially if you have more than one of the same Snap in your pipeline.

Schema name

The database schema name. In case it is not defined, then the suggestion for the table name will retrieve all tables names of all schemas. The property is suggest-able and will retrieve available database schemas during suggest values.

Example: SYS
Default value: None

Table name

Name of table to execute select query on.

Example: people

Default value: None

Where clause

Where clause of select statement. This supports document value substitution (such as $person.firstname will be substituted with the value found in the incoming document at the path). However, you may not use a value substitution after "IS" or "is" word. Please see the examples below.

Examples:

Without using expressions

EmpId = 12
email = 'you@example.com'

Using expressions

"EMPNO=$EMPNO and ENAME=$EMPNAME"
email = $email
emp=$emp
"emp='" + $emp + "'"
"EMPNO=" + $EMPNO + " and ENAME='" + $EMPNAME+ "'"

Caution

Using expressions that join strings together to create SQL queries or conditions has a potential SQL injection risk and is hence unsafe. Ensure that you understand all implications and risks involved before using concatenation of strings with '=' Expression enabled.

Order by columns

Enter in the columns in order to order by. The default database sort order will be used.

Example:

name

email

Default value: None

Limit offset

Starting row for the query

Example: 0

Default value: None

Output fields

Enter or select output field names for SQL SELECT statement. To select all fields, leave it at default.

Example: email, address, first, last, etc.

Default value: None

Fetch Output Fields In Schema

Select this check box to include only the selected fields or columns in the Output Schema (second output view). If you do not provide any Output fields, all the columns are visible in the output.
If you provide output fields, we recommend you to select Fetch Output Fields In Schema check box.

Default value: Not selected

Pass through

If checked, the input document will be passed through to the output view under the key 'original'.

Default value: Selected

Ignore empty result

If checked, no document will be written to the output view when the SELECT operation does not produces any result. If this property is unchecked and the Pass through property is checked, the input document will be passed through to the output view.

Default value: False

Auto commit

Select one of the options for this property to override the state of the Auto commit property on the account. The Auto commit at the Snap-level has three values: True, False, and Use account setting. The expected functionality for these modes are:

True - The Snap will execute with auto-commit enabled regardless of the value set for Auto commit in the Account used by the Snap.
False - The Snap will execute with auto-commit disabled regardless of the value set for Auto commit in the Account used by the Snap.
Use account setting - The Snap will execute with Auto commit property value inherited by the Account used by the Snap.

Default value: Use account setting

Snap Execution

Select one of the three modes in which the Snap executes. Available options are:

Validate & Execute: Performs limited execution of the Snap, and generates a data preview during Pipeline validation. Subsequently, performs full execution of the Snap (unlimited records) during Pipeline runtime.
Execute only: Performs full execution of the Snap during Pipeline execution without generating preview data.
Disabled: Disables the Snap and all Snaps that are downstream from it.

For the 'Suggest' in the Order by columns and the Output fields properties, the value of the Table name property should be an actual table name instead of an expression. If it is an expression, it will display an error message "Could not evaluate accessor: ..." when the 'Suggest' button is pressed. This is because, at the time of "Suggest" button pressed, the input document is not available for the Snap to evaluate the expression in the Table name property. The input document is available to the Snap only during the preview or execution time.

Example

In this basic pipeline, the Teradata Snap selects the records from the table, 'snaplogic"."employee1' with the defined order and the output fields.

The successful execution of the pipeline displays the below output preview:

Snap Pack History

Click to view/expand

Release	Snap Pack Version	Date	Type	Updates
February 2024	main25112	14 Feb 2024	Stable	Updated and certified against the current SnapLogic Platform release.
November 2023	main23721	08 Nov 2023	Stable	Updated and certified against the current SnapLogic Platform release.
August 2023	main22460	16 Aug 2023	Stable	The Teradata Execute Snap now includes a new Query type field. When Auto is selected, the Snap tries to determine the query type automatically.
May 2023	main21015	10 May 2023	Stable	Upgraded with the latest SnapLogic Platform release.
February 2023	main19844	09 Feb 2023	Stable	Upgraded with the latest SnapLogic Platform release.
November 2022	main18944	10 Nov 2022	Stable	The TPT Insert Snap now creates the target table only from the table metadata of the second input view when the following conditions are met: The Create table if not present checkbox is selected. The target table does not exist. The table metadata is provided in the second input view.
August 2022	main17386	11 Aug 2022	Stable	Upgraded with the latest SnapLogic Platform release.
4.29 Patch	429patches16235	21 Jul 2022	Latest	Fixed an issue with Teradata Execute Snap where the Snap did not display valid error message when the delete condition is invalid.
4.29	main15993	14 May 2022	Stable	Enhanced the Teradata FastExport Snap with Character Set dropdown list to support encoding of data when you export data from the Teradata Database.
4.28	main14627	12 Feb 2022	Stable	Upgraded with the latest SnapLogic Platform release.
4.27	main12833	13 Nov 2021	Stable	Enhanced the Teradata Execute Snap to invoke stored procedures.
4.26	main11181	14 Aug 2021	Stable	Upgraded with the latest SnapLogic Platform release.
4.25 Patch	425patches11008	04 Aug 2021	Latest	Improved the error messages for all the Snaps in the Teradata Snap Pack where the Snaps fail with a null pointer exception error when the account reference provided is invalid.
4.25	main9554	08 May 2021	Stable	Upgraded with the latest SnapLogic Platform release.
4.24 Patch	424patches8799	05 Mar 2021	Latest	Enhanced the Teradata Execute Snap by adding a new field, Advanced options, which extends support with microsecond precision for TIMESTAMP data type. Fixed an issue in the TPT Load Snap where the Snap failed to load data into the table while creating an output. Fixed an issue with the TPT Load Snap wherein now a null value is loaded as null and empty string is loaded as empty string. This fix may cause existing pipelines to fail if empty string values are expected to be loaded as null. Following are the new configurations: `VARCHAR QuotedData= Optional` `VARCHAR OpenQuoteMark= \”` `VARCHAR NullColumns= Yes`
4.24	main8556	13 Feb 2021	Stable	Enhanced the Teradata Select Snap to return only the selected output fields or columns in the output schema (second output view) using the Fetch Output Fields In Schema check box. If the Output Fields field is empty all the columns are visible.
4.23	main7430	14 Nov 2020	Stable	Fixes the multi-line value issue and issue in the TPT Load Snap where the Snap writes null for both an empty string and null values in the input data. The fix for this issue was to add the following three lines in the script and wrap all the values in double quotes unless they are null while writing the input data into a temp CSV file. VARCHAR QuotedData = 'Optional', VARCHAR OpenQuoteMark = '\"' VARCHAR NullColumns = 'Yes' This fix may cause existing pipelines to fail if empty string values are expected to be loaded as null.
4.22	main6403	12 Sep 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.21 Patch	421patches6272	27 Jul 2020	Latest	Fixed the issue where Snowflake SCD2 Snap generates two output documents despite no changes to Cause-historization fields with DATE, TIME and TIMESTAMP Snowflake data types, and with Ignore unchanged rows field selected.
4.21 Patch	421patches6144	20 Jul 2020	Latest	Fixed the following issues with DB Snaps: The connection thread waits indefinitely causing the subsequent connection requests to become unresponsive. Connection leaks occur during Pipeline execution.
4.21 Patch	MULTIPLE8841	19 May 2020	Latest	Fixed the connection issue in Database Snaps by detecting and closing open connections after the Snap execution ends.
4.21	snapsmrc542	09 May 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.20	snapsmrc535	08 Feb 2020	Stable	Upgraded with the latest SnapLogic Platform release.
4.19 Patch	db/teradata8414	13 Dec 2019	Latest	Fixed an issue with the TPT Update Snap wherein the Snap is unable to perform operations when: An expression is used in the Update condition property. Input data contain the character '?'.
4.19	snaprsmrc528	14 Nov 2019	Stable	Upgraded with the latest SnapLogic Platform release.
4.18	snapsmrc523	10 Aug 2019	Stable	Upgraded with the latest SnapLogic Platform release.
4.17	ALL7402	11 Jun 2019	Latest	Pushed automatic rebuild of the latest version of each Snap Pack to SnapLogic UAT and Elastic servers.
4.17	snapsmrc515	11 Jun 2019	Latest	Fixed an issue with the Teradata Execute Snap wherein the Snap would send the input document to the output view even if the Pass through field is not selected in the Snap configuration. With this fix, the Snap sends the input document to the output view, under the key original, only if you select the Pass through field. Added the Snap Execution field to all Standard-mode Snaps. In some Snaps, this field replaces the existing Execute during preview check box.
4.16	snapsmrc508	16 Feb 2019	Stable	Upgraded with the latest SnapLogic Platform release.
4.15 Patch	db/teradata6338	05 Dec 2018	Latest	Replaced Max idle time and Idle connection test period properties with Max life time and Idle Timeout properties respectively, in the Account configuration. The new properties fix the connection release issues that were occurring due to default/restricted DB Account settings.
4.15	snapsmrc500	15 Dec 2018	Stable	Upgraded with the latest SnapLogic Platform release.
4.14	snapsmrc490	11 Aug 2018	Stable	Upgraded with the latest SnapLogic Platform release.
4.13	snapsmrc486	12 May 2018	Stable	Upgraded with the latest SnapLogic Platform release.
4.12	snapsmrc480	17 Feb 2018	Stable	Upgraded with the latest SnapLogic Platform release.
4.11	snapsmrc465	11 Nov 2017	Stable	Upgraded with the latest SnapLogic Platform release.
4.10	snapsmrc414	12 Aug 2017	Stable	Added Auto commit property to the Select and Execute Snaps at the Snap level to support overriding of the Auto commit property at the Account level.
4.9.0 Patch	teradata3077	01 Jun 2017	Latest	Fixed an issue regarding connection not closed after login failure; Expose autocommit for "Select into" statement in PostgreSQL Execute Snap and Redshift Execute Snap
4.9	snapsmrc405	13 May 2017	Stable	Enhanced the Output view of the Snap with Order Summary field that displays the output values (added to the out, err, status, classpath and env fields of the single output view that display the subprocess only). Teradata Export to HDFS Snap supported with Dynamic account.
4.8	snapsmrc398	11 Feb 2017	Stable	Introduced the TPT Delete, Insert, Load, Upsert and Update Snaps in this release. Introduced Teradata Export to HDFS Snap in this release. Info tab added to accounts. Database accounts now invalidate connection pools if account properties are modified and login attempts fail.
4.7	snapsmrc382	23 Nov 2016	Stable	Introduced the Teradata FastLoad and Execute Snaps in this release. Migration impact: In Teradata FastExport, the values of the Data Format field have been standardized to be in all caps. Existing pipelines that use the values of Binary, Text, or Unformatted will fail unless the new value of BINARY, TEXT, or UNFORMAT are used.
4.6	snapsmrc362	13 Aug 2016	Stable	Snap Pack introduced in 4.6.0. This includes only Teradata extract functionality to move data out of Teradata database using the FastExport Utility. It does not include Snaps for load, select, insert, delete, execute or others at this time. It also does not utilize the Teradata Parallel Transporter to extract data.