Use Native Executors with PostgreSQL

This page describes how to use Liquibase with the PSQL native executor on a PostgreSQL database.

Prerequisites

• Use Liquibase 4.13.0 or later.
• Add PSQL to your PATH environment variable. Alternatively, pass its location in the liquibase.psql.conf file or from the command prompt during runtime. See liquibase.psql.path in the PSQL integration arguments section.

Note: Liquibase searches the executor location in the following order: runtime arguments, .conf file values, and then your PATH.

Setup

1. Add the runWith attribute to the needed changesets in the changelog:
• SQL: runWith:psql
• XML: runWith="psql"
• YAML: runWith: psql
• JSON: "runWith": "psql"

Tip: For more information, see the runWith and psql examples section.

2. Specify the PSQL integration arguments in one of the following ways:
• Pass the values at runtime on the command line
• Add the values to liquibase.psql.conf or the Liquibase properties file.
• Set the values as environment variables
• Run the values as Java system properties (JAVA_OPTS) along with any command at the command prompt:
Windows

set JAVA_OPTS=-Dliquibase.psql.<option>=<value> && liquibase <command> --changelog-file=my_script.sql

macOS/Linux

export JAVA_OPTS=-Dliquibase.psql.<option>=<value> && liquibase <command> --changelog-file=my_script.sql

3. Run a Liquibase command:

Example: liquibase status --changelog-file=my_script.sql

Note: If the command fails, you will receive an error message. However, if you add a property that is not used in Liquibase to the liquibase.psql.conf file, no error occurs. Liquibase only ignores it.

PSQL integration arguments

Note: Syntax for each parameter is specified in kebab-case (CLI and flow file), camelCase (properties file and JAVA_OPTS), and MACRO_CASE (environment variable).

--psql-args
liquibase.psql.args
LIQUIBASE_PSQL_ARGS

--psql-keep-temp
liquibase.psql.keep.temp
LIQUIBASE_PSQL_KEEP_TEMP

--psql-keep-temp-name
liquibase.psql.keep.temp.name
LIQUIBASE_PSQL_KEEP_TEMP_NAME

--psql-keep-temp-path
liquibase.psql.keep.temp.path
LIQUIBASE_PSQL_KEEP_TEMP_PATH

--psql-log-file
liquibase.psql.logFile
LIQUIBASE_PSQL_LOG_FILE

--psql-path
liquibase.psql.path
LIQUIBASE_PSQL_PATH

--psql-timeout
liquibase.psql.timeout
LIQUIBASE_PSQL_TIMEOUT

runWith and psql examples

Formatted SQL changeset using the runWith attribute

--liquibase formatted sql
				
--changeset myauthorname:2314 runWith:psql
			
	DECLARE l_emp_name VARCHAR2(250);	
	l_emp_no NUMBER;	
	l_salary NUMBER;	
			
	l_manager VARCHAR2(250);	
	BEGIN	
	INSERT INTO emp(emp_name,emp_no,salary,manager) VALUES('BBB',1000,25000,'AAA');
	
	...	
	END;		
	/

XML changelog with the inline SQL changeset using the runWith attribute

<?xml version="1.0" encoding="UTF-8"?>

<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
    xmlns:pro="http://www.liquibase.org/xml/ns/pro"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd
        http://www.liquibase.org/xml/ns/pro
        http://www.liquibase.org/xml/ns/pro/liquibase-pro-latest.xsd">

<changeSet id="2" author="myauthorname" runWith="psql"> 
<sql>
	DECLARE l_emp_name VARCHAR2(250);
	l_emp_no NUMBER;
	l_salary NUMBER;
	l_manager VARCHAR2(250);
       BEGIN
	INSERT INTO emp(emp_name,emp_no,salary,manager) VALUES('BBB',1000,25000,'AAA');
	...
	END;
	/
</sql> 

</changeSet>

XML changelog pointing to an SQL file with raw SQL in it

<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
    xmlns:pro="http://www.liquibase.org/xml/ns/pro"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd
        http://www.liquibase.org/xml/ns/pro
        http://www.liquibase.org/xml/ns/pro/liquibase-pro-latest.xsd">					

<changeSet id="2315" author="myauthorname" runWith="psql">  
	<sqlFile
	path="my/path/file.sql"
... > 
</changeSet>

YAML changelog pointing to an SQL file with raw SQL in it

databaseChangeLog:
   - changeSet:
       id: 1-yaml
       author: myauthorname
       runWith: psql
       changes:
       - sqlFile:
           path: person.sql
           relativeToChangelogFile: true

JSON changelog pointing to an SQL file with raw SQL in it

{
	"databaseChangeLog": [
	   {
		"changeSet": {
		  "id": "1-json",
		  "author": "myauthorname",
		  "runWith": "psql",
		  "changes": [
			{
			      "sqlFile":{
				      "path": "person.sql",
				      "relativeToChangelogFile": "true"
				}
			 }
		   ]
	     }
       }

Best practices

• Do not set the endDelimiter or splitStatements=true property on PSQL changesets. PSQL handles delimiters and statement splitting natively.
• Prevent hanging queries by configuring the timeout. In your liquibase.psql.config file, add liquibase.psql.timeout=nn, where nn is time in seconds to wait before stopping the process.
• Save the output of your spool files to your temp directory by adding liquibase.psql.keep.temp=true to the liquibase.psql.conf file.

Example liquibase.psql.conf file

# The full path to the psql executable.
# Sample Linux path
# liquibase.psql.path=/usr/local/bin/psql
# Sample Windows path
# liquibase.psql.path="C:\\Program Files\\PostgreSQL\\<version>\\bin\\psql.exe"

# Timeout value for the execution of the psql tool
# Measured in seconds. -1 to disable.
liquibase.psql.timeout=-1

# Flag to indicate whether or not to keep the temporary SQL file after execution of psql.
# True = keep False = delete (default)
liquibase.psql.keep.temp=false

# OPTIONAL Flag to designate the location to store temporary SQL file after execution of psql.
# Liquibase will attempt to use path exactly as entered, so please ensure it complies with your OS requirements.
# liquibase.psql.keep.temp.path=

# OPTIONAL Flag to designate the name of temporary SQL file after execution of psql.
# Liquibase will attempt to use the name exactly as entered, so please ensure it complies with your OS requirements.
# liquibase.psql.keep.temp.name=

# OPTIONAL Args to pass directly to psql.
# Note: The delimiter for args is a space eg:" " and not "," or ";" separated.
# liquibase.psql.args=

# OPTIONAL Path to a log file for the psql output
# liquibase.psql.logFile=

Related links

• runWith
• runWithSpoolFile
• modifyChangeSets
• Using Liquibase with PostgreSQL Platforms