GitHub - vertical-blank/sql-formatter: SQL formatter written with only Java Standard Library, without dependencies.

Java port of great SQL formatter https://github.com/zeroturnaround/sql-formatter.

Written with only Java Standard Library, without dependencies.

Demo is running on Google Cloud Function, with native-compiled shared library by GraalVM.

This does not support:

Stored procedures.
Changing of the delimiter type to something else than ;.

Usage

Maven

<dependency>
  <groupId>com.github.vertical-blank</groupId>
  <artifactId>sql-formatter</artifactId>
  <version>2.0.5</version>
</dependency>

Gradle

implementation 'com.github.vertical-blank:sql-formatter:2.0.5'

Examples

You can easily use com.github.vertical_blank.sqlformatter.SqlFormatter :

SqlFormatter.format("SELECT * FROM table1")

This will output:

You can also pass FormatConfig object built by builder:

SqlFormatter.format('SELECT * FROM tbl',
  FormatConfig.builder()
    .indent("    ") // Defaults to two spaces
    .uppercase(true) // Defaults to false (not safe to use when SQL dialect has case-sensitive identifiers)
    .linesBetweenQueries(2) // Defaults to 1
    .maxColumnLength(100) // Defaults to 50
    .params(Arrays.asList("a", "b", "c")) // Map or List. See Placeholders replacement.
    .build()
);

Dialect

You can pass dialect com.github.vertical_blank.sqlformatter.languages.Dialect or String to SqlFormatter.of :

SqlFormatter
    .of(Dialect.N1ql)  // Recommended
     //.of("n1ql")      // String can be passed
    .format("SELECT *");

SQL formatter supports the following dialects:

sql - Standard SQL
mariadb - MariaDB
mysql - MySQL
postgresql - PostgreSQL
db2 - IBM DB2
plsql - Oracle PL/SQL
n1ql - Couchbase N1QL
redshift - Amazon Redshift
spark - Spark
tsql - SQL Server Transact-SQL

Extend formatters

Formatters can be extended as below :

SqlFormatter
    .of(Dialect.MySql)
    .extend(cfg -> cfg.plusOperators("=>"))
    .format("SELECT * FROM table WHERE A => 4")

Then it results in:

SELECT
  *
FROM
  table
WHERE
  A => 4

Placeholders replacement

You can pass List or Map to format :

// Named placeholders
Map<String, String> namedParams = new HashMap<>();
namedParams.put("foo", "'bar'");
SqlFormatter.of(Dialect.TSql).format("SELECT * FROM tbl WHERE foo = @foo", namedParams);

// Indexed placeholders
SqlFormatter.format("SELECT * FROM tbl WHERE foo = ?", Arrays.asList("'bar'"));

Both result in:

SELECT
  *
FROM
  tbl
WHERE
  foo = 'bar'

Build

Building this library requires JDK 11 because of ktfmt.