SQL Server - Merge

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Snap type:

Write


Description:

This Snap executes a SQL Merge with the given properties. The documents that are provided in the input view will be merged into the provided table on the provided database. Each document on the input view is expected to be merged or created with/as a new record in the table.

This Snap supports SQL Server 2008 or newer.

Merges will be batched up until the account's batch size property or until the structure of the update statement changes. An update statement will change if an incoming document contains different keys than a previous document.

The merge condition can only use variables, no constants or pipeline parameters. 

A good example for a merge condition is SALARY =$SALARY (here we use the SALARY variable of the input document). A bad example for a merge condition is SALARY = '100000' (this will not work since we validate the provided columns in the condition against the types defined in the table schema).


While the expression toggle is available on the Merge Condition field, use of the expression toggle on the merge condition is not encouraged. 

The bad example can be rewritten by using an upstream Mapper Snap, where '10000' is mapped to the SALARY variable, which then can be used in the merge condition as defined in a good example. The same applies for pipeline parameters, which need to be mapped upstream similarly using a Mapper Snap. 


Expected upstream Snaps: The columns of the selected table need to be mapped upstream using a Mapper Snap. The Mapper Snap will provide the target schema,which reflects the schema of the table that is selected for the merge Snap.

Expected downstream Snaps: The Snap will output one document for every record merged, hence any document processing Snap can be used downstream.

Expected input: Document that conforms to the input view schema of the Snap. The input view schema is provided to an upstream Mapper Snap, based on the selected service object.

Expected output: Document which represents the status of the merge operation for that document. Each merge operation is represented as one document in the output view.
  

Prerequisites:

None


Support and limitations:
Account: 


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


Views:
InputThis Snap allows exactly one input view. 
Output

This Snap has at most one output view. If an output view is available, then the original document that was used to create the statement will be output with the status of the merge executed.

Error

This Snap has at most one error view and produces zero or more documents in the view.

Because the Snap must report what is reported by the database, the Snap sends all records to the error view and no record to the output view. If you want to see accurate results for each row you must set the batch size to 1 and execute the pipeline.

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 table names of all schemas. The property is suggestible and will retrieve available database schemas during suggest values.


The values can be passed using the pipeline parameters but not the upstream parameter.

Example: SYS
Default value:  [None]


Table Name

Required. The table to execute the merge on.

The values can be passed using the pipeline parameters but not the upstream parameter.

Example: people

Default value:  [None]


Number of retries

Specifies the maximum number of attempts to be made to receive a response. The request is terminated if the attempts do not result in a response.

When you enable retry and a connection failure occurs that cannot be recovered by retry, the Snap writes a connection failure error in the error view. In some cases, the error view records might contain duplicate data that was written to the database. Ensure to verify all the records in the error file before you restart the merge request. You can locate the duplicate records in the error view by checking the $reason property for the sub-string: Connection is not available, request timed out.

Example: 3

Default value: 0

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If you're experiencing issues please see our Troubleshooting Guide.

Retry interval (seconds)

Specifies the time interval between two successive retry requests. A retry happens only when the previous attempt resulted in an exception. 

Example:  10

Default value: 1

When you enable retry and a connection failure occurs that cannot be recovered by retry, the Snap writes a connection failure error in the error view. In some cases, the error view records might contain duplicate data that was written to the database. Ensure to verify all the records in the error file before you restart the merge request. You can locate the duplicate records in the error view by checking the $reason property for the sub-string: Connection is not available, request timed out.

Merge condition

Required. The ON condition of the merge statement.  A boolean-type expression is expected. See Merge Syntax for an explanation of merge syntax.

Default value:  [None]


Identity column 

Required. The table's identity column. If this is not set and the column is set to be generated always, then the merge will fail.

Default value:  [None]

Enable identity insert

Select the check box to insert values from the input document into the target table identity column. Ensure that the target table contains an identity column. If you do not select the check box, then the Snap strips any value that is meant for the identity column from the input document.

Default value: Not selected

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.

 

Examples

The following example illustrates the usage of SQL Merge Snap. In this example, we will supply two documents from upstream having customer information. We will try to merge this data into table called 'customer1'. One of the documents has the data of existing customer with an updated 'phoneno' field and other document is of new customer.


Following is the sample pipeline:

Input data is passed using the JSON Generator Snap. Following is the sample data passed: 




The merge condition is applied on field 'customername' of customer1 table. Once the merge Snap execution completes, the record with customername 'John' updates its phoneno and a new record is created for customer 'Shaun'.

The sample output looks as shown below:



See Also

Snap Pack History

 Click to view/expand
Release Snap Pack VersionDateType  Updates
4.27main12833 Stable

Enhanced the SQL Server - Execute Snap to invoke stored procedures.

4.26 Patch426patches12535Latest

Fixed an issue in the SQL Server Bulk Load snap where boolean data type failed to load into BIT field.

4.26main11181 StableUpgraded with the latest SnapLogic Platform release.
4.25 Patch425patches10797 Latest

Fixed an issue with the SQL Server - Bulk Load Snap where the Snap fails when the login password contains a colon or a less than (<) symbol.

4.25main9554
 
StableUpgraded with the latest SnapLogic Platform release.

4.24 Patch

424patches8657 Latest

Enhances the SQL Server - Select Snap by introducing a new field, Query Hints, which helps to customize and optimize the database engine to process query statements.

4.24main8556
Stable
  • Enhances the SQL Server - 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.
  • Enhances the SQL Server - Stored Procedure to accept parameters from input documents by column keys. If the values are empty, the parameters are populated based on the column keys for easier mapping in the upstream Mapper Snap.
4.23 Patch423patches8190 Latest

Fixes an issue with SQL Server - Execute to handle SQL statements that begin with special characters.

4.23main7430
 
Stable

Enhances the accounts in this Snap Pack to allow Windows-based (Active Directory) authentication and user impersonation for SQL Server user accounts.

4.22 Patch

422patches6728 Latest

Enhances the SQL Server Snap pack to allow Windows (Active Directory) based authentication and user impersonation for SQL Server user accounts.

4.22main6403
 
StableUpgraded with the latest SnapLogic Platform release.

4.21 Patch

421patches6272 Latest

Fixes 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 LatestFixes 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 Latest

Fixes the connection issue in Database Snaps by detecting and closing open connections after the Snap execution ends. 

4.21 Patch 

db/sqlserver8837 Latest

Fixed the SQL Server - Stored Procedure Snap to support the UUID datatype.

4.21snapsmrc542

 

StableUpgraded with the latest SnapLogic Platform release.

4.20 Patch 

db/sqlserver8793 Latest

Fixed an issue in the SQL Server - Insert Snap due to which the Snap failed to load values of data type INT.

4.20 Patch 

db/sqlserver8796 Latest

Fixed the SQL Server - Bulk Load Snap to mask the password in the logged exception messages

4.20snapsmrc535
 
StableUpgraded with the latest SnapLogic Platform release.

4.19 Patch 

db/sqlserver8413 Latest

Fixed an issue with the SQL Server - 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 '?'.
4.19snaprsmrc528
 
StableUpgraded with the latest SnapLogic Platform release.

4.18 Patch

 db/sqlserver7989 Latest

Fixed an issue in the SQL Server - Merge Snap wherein identity columns are not handled correctly. Also, added a field, Enable Identity Insert, that enables you to insert values into an identity column.

4.18snapsmrc523
 
Stable
  • Added support for SQL Server account Active Directory authentication for SQL server for driver JAR version mssql-jdbc-6.2.2-jre8.jar.
  • Reverts a 4.17-patch (db/sqlserver7394) update regarding how BIT and BOOLEAN column data type values are displayed. They now display as true or false (4.17 GA behavior in snapsmrc515) rather than converting to 0 or 1 values (4.17-patch behavior).
4.17 PatchMULTIPLE7479 Latest

Fixed an issue with the SQL Server - Lookup Snap wherein it fails a UUID search.

4.17ALL7402
 
Latest

Pushed automatic rebuild of the latest version of each Snap Pack to SnapLogic UAT and Elastic servers.

4.17snapsmrc515
 
Latest
  • Fixed an issue with the SQL Server 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 Patch

 db/sqlserver6981 Latest

Fixed an issue of slow performance in SQL Server Snaps while using SQL Server Dynamic account type. 

4.16 Patch db/sqlserver6818 Latest

Fixed an issue with the Lookup Snap passing data simultaneously to output and error views when some values contained spaces at the end.

4.16snapsmrc508
 
StableUpgraded with the latest SnapLogic Platform release.

4.15 Patch

 db/sqlserver6337 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.

4.15snapsmrc500
 
StableUpgraded with the latest SnapLogic Platform release.

4.14 Patch 

db/sqlserver5912 Latest

Fixed an issue to parse the right data type and display it in the input schema for SQL Server Snap..

4.14 Patch 

db/sqlserver5665 Latest

Implemented a connection retry logic in the SQL Server account to resolve the connection loss issue in a customer's org.

4.14snapsmrc490
 
StableUpgraded with the latest SnapLogic Platform release.
4.13

snapsmrc486

 
StableUpgraded with the latest SnapLogic Platform release.
4.12

snapsmrc480

 
StableUpgraded with the latest SnapLogic Platform release.

4.11 Patch 

db/sqlserver4388 Latest

Fixed an issue with the Stored Procedure Snap that does not maintain the columns' order on the output as per table's definition.

4.11 Patch

 db/sqlserver4288 Latest

 SQL Server Snap Pack - Fixed an issue when inserting a valid NaN value into a column.

4.11snapsmrc465
 
StableUpgraded with the latest SnapLogic Platform release.

4.10 Patch

sqlserver3953 Latest

Fixed an issue where the SQL Server Stored Procedure gets hanged when more than one Snap existed in the pipeline each processing greater than 1K documents.

4.10

snapsmrc414

 
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

sqlserver3224 Latest

Addressed an issue with SQL Server - Bulk Load execution even with 0 input documents

4.9.0 Patch

sqlserver3076 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

4.9snapsmrc405
 
StableUpgraded with the latest SnapLogic Platform release.

4.8.0 Patch

sqlserver2803 Latest

Addressed an issue with slow performance with Bulk Load BCP.

4.8.0 Patch

sqlserver2761 Latest

Potential fix for JDBC deadlock issue.

4.8.0 Patch

sqlserver2706 Latest

Fixed SQL Server Snap Pack rendering dates that are one hour off from the date returned by database query for non-UTC Snaplexes.

4.8

snapsmrc398

 
StableUpgraded with the latest SnapLogic Platform release.
4.7

snapsmrc382

 
Stable
  • Extended support for SQL Server Dynamic accounts.
  • Updated the SQL Server Stored Procedure Snap with the Pass through field. 
4.6snapsmrc362
 
Stable
  • Resolved an issue in SQL Server Bulk Load Snap that caused BCP program related failures.
  • Enhanced to fully support SQL statements with/without expressions & SQL bind variables.
  • Resolved an issue that caused failures when executing merge statements.
4.5.1

snapsmrc344

 
LatestUpgraded with the latest SnapLogic Platform release.
4.5

snapsmrc344

 Stable
  • Resolved an issue in SQL Server Execute Snap that erroneously reported a database/schema mismatch during Snap/pipeline execution.
  • Resolved an issue in SQL Server Lookup Snap that occurred when handling case-insensitive field values.
4.4.1NA Latest
  • Introduced the SQL Bulk Load in this release.