In this article

1 Overview
- 1.1 Snap Type
- 1.2 Prerequisites
- 1.3 Support for Ultra Pipelines
- 1.4 Limitations & Known Issues
2 Snap Views
3 Snap Settings
- 3.1 Execute SQL statements
  - 3.1.1 Without expressions
  - 3.1.2 With expressions
4 Troubleshooting
5 Example
- 5.1 Downloads
6 Snap Pack History

Overview

You can use this Snap to execute arbitrary SQL queries. This Snap works only with single queries.

You can drop your database with the execution, so we recommend you to be cautious.
You can execute stored procedures containing IN, OUT, INOUT parameters using this Snap.

Snap Type

SQL Server - Execute Snap is a Write-type Snap that executes an SQL Server statement/query.

Prerequisites

None.

Support for Ultra Pipelines

Works in Ultra Pipelines.

Limitations & Known Issues

When the SQL statement property is an expression, the pipeline parameters are shown in the suggest, but not the input schema.

Snap Views

Type	Format	Number of Views	Examples of Upstream and Downstream Snaps	Description

Type

Format

Number of Views

Examples of Upstream and Downstream Snaps

Description

Input

Document

Min: 0
Max: 1

Mapper
Copy

This Snap allows zero or one input views. If the input view is defined, then the where clause can substitute incoming values for a given expression.

Output

Document

Min: 0
Max: 1

JSON Formatter

This Snap allows zero or one output view and produces documents in the view.

Error

Error handling is a generic way to handle errors without losing data or failing the Snap execution. You can handle the errors that the Snap might encounter when running the Pipeline by choosing one of the following options from the When errors occur list under the Views tab:

Stop Pipeline Execution: Stops the current pipeline execution if the Snap encounters an error.
Discard Error Data and Continue: Ignores the error, discards that record, and continues with the remaining records.
Route Error Data to Error View: Routes the error data to an error view without stopping the Snap execution.

Learn more about Error handling in Pipelines.

Database Write Snaps output all records of a batch (as configured in your account settings) to the error view if the write fails during batch processing.

Snap Settings

Asterisk (*): Indicates a mandatory field.
Suggestion icon (): Indicates a list that is dynamically populated based on the configuration.
Expression icon (): Indicates whether the value is an expression (if enabled) or a static value (if disabled). Learn more about Using Expressions in SnapLogic.
Add icon (): Indicates that you can add fields in the field set.
Remove icon (): Indicates that you can remove fields from the field set.

Field Name	Field Type	Description

Field Name	Field Type	Description
Label* Default Value: SQL Server - Execute Example: Execute EmployeeRecords	String	Specify 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.
SQL statement* Default Value: N/A Example: INSERT into SnapLogic.book (id, book) VALUES ($id,$book)	String/Expression	Specify the SQL statement to execute on the server. Learn more about how to execute SQL statements. We recommend you to add a single query in the SQL Statement field. You cannot use pipeline parameters within your SQL statement. If you need to use parameters, connect a Mapper Snap before the SQL Snap and provide the values. Avoid using non-standard words, such as `GO` in SQL statements, as `GO` is not a recognized keyword in SQL Server. Table name and column names must not be provided as bind parameters. Only values can be provided as bind parameters. Valid JSON paths that are defined in the WHERE clause for queries/statements will be substituted with values from an incoming document. Single quotes in values must be escaped Any relational database (RDBMS) treats single quotes (`'`) as special symbols. So, single quotes in the data or values passed through a DML query may cause the Snap to fail when the query is executed. Ensure that you pass two consecutive single quotes in place of one within these values to escape the single quote through these queries. For example:
Query type Default Value: Auto Example: Read	Dropdown list/Expression	Select the type of query for your SQL statement (Read or Write). When Auto is selected, the Snap tries to determine the query type automatically. If the execution result of the query is not as expected, you can change the query type to Read or Write.
Pass through Default Value: Selected	Checkbox	Select this checkbox to pass the input document to the output view under the key 'original'. This property applies only to the Execute Snaps with SELECT statement.
Ignore empty result Default Value: Deselected	Checkbox	Select this checkbox to ignore empty result; no document is written to the output view when a SELECT operation does not produce any result. If you deselect this checkbox and the Pass through checkbox is selected, the input document is passed through to the output view.
Number of retries Default Value: 0 Example: 3	Integer/Expression	Specify the maximum number of retry attempts the Snap must make in case there is a network failure and is unable to read the target file. The request is terminated if the attempts do not result in a response. If the Number of retries value is set to 0 (the default value), the retry option is disabled, and the Snap does not initiate a retry. The pipeline will not attempt to retry the operation in case of a failure—any failure encountered during the database operation will immediately result in the pipeline failing without any retry attempts to recover from the errors. If the Number of retries value is greater than 0, the Snap initiates a download of the target file into a temporary local file. If any error occurs during the download, the Snap waits for the time specified in the Retry interval and then attempts to download the file again from the beginning. After the download is successful, the Snap streams the data from the temporary file to the downstream pipeline. All temporary local files are deleted when they are no longer needed. Ensure that the local drive has sufficient free disk space to store the temporary local file.
Retry interval (seconds) Default Value: 1 Example: 10	Integer/Expression	Specify the time interval between two successive retry requests. A retry happens only when the previous attempt resulted in an exception.
Auto commit Default value: Use account setting Example: True	Dropdown list	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. 'Auto commit' may be enabled for certain use cases if PostgreSQL jdbc driver is used in either Redshift, PostgreSQL or generic JDBC Snap. But the JDBC driver may cause out of memory issues when Select statements are executed. In those cases, “Auto commit" in Snap property should be set to ‘False’ and the Fetch size in the “Account setting" can be increased for optimal performance.
Default Value: Execute only Example: Validate & Execute	Dropdown list

Execute SQL statements

Without expressions

If you do not enable the expression toggle of the SQL statement field, then:

The SQL statement must not be within quotes.
The $<variable_name> parts of the SQL statement are expressions. In the below example, $id and $book.

Examples:

email = 'you@example.com' or email = $email
emp=$emp

Additionally, the JSON path is allowed only in the WHERE clause. If the SQL statement starts with SELECT (case-insensitive), the Snap regards it as a select-type query and executes once per input document. If not, it regards it as a write-type query and executes in batch mode.

With expressions

If you enable the expression toggle of the SQL statement field, then:

The SQL statement must be within quotes.
The + $<variable_name> + parts of the SQL statement are expressions, and must not be within quotes. In the below example, $tablename.
The $<variable_name> parts of the SQL statement are bind parameter, and must be within quotes. In the below example, $id and $book.

Examples:

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

The non-expression form uses bind parameters, so it is much faster than executing N arbitrary SQL expressions.
Using expressions that join strings together to create SQL queries or conditions has a potential SQL injection risk and hence unsafe. Ensure that you understand all implications and risks involved before using concatenation of strings with '=' Expression enabled.
The '$' sign and identifier characters, such as double quotes (“), single quotes ('), or back quotes (`), are reserved characters and should not be used in comments or for purposes other than their originally intended purpose.

Troubleshooting

Error	Reason	Resolution

Error	Reason	Resolution
`Failure: Batch operation failed. Error code: 102`	Incorrect syntax near 'GO'.	Rewrite the query without ‘GO’ and run it.

Example

In this example, we have a table named "customer1" that stores user details. It has the columns: product, phoneno, customername, city, country. We will execute the query and retrieve customers with given name.

Download this pipeline.

We need to provide the query used to pull the data from customer1 table in SQL statement property. We will provide dynamic variable values from the upstream JSON Generator Snap. On Validation, the Snap displays the output.

Downloads

Important steps to successfully reuse Pipelines

Download and import the Pipeline into SnapLogic.
Configure Snap accounts as applicable.
Provide Pipeline parameters as applicable.

SnapLogic Documentation

SQL Server - Execute