de-jaggl / sqlbuilder

A Java-Library to build SQL-Statements

SQLbuilder

A Java-Library to build SQL-Statements

Dependency

<dependency>
  <groupId>de.jaggl.sqlbuilder</groupId>
  <artifactId>sqlbuilder-core</artifactId>
  <version>2.7.2</version>
</dependency>

Simple Example

private static final Table PERSONS = Table.create("persons");
private static final VarCharColumn FORENAME = PERSONS.varCharColumn("forename").size(50).build();
private static final VarCharColumn LASTNAME = PERSONS.varCharColumn("lastname").size(50).build();

public static final void main(String[] args)
{
  Queries.select()
  	.from(PERSONS)
  	.where(LASTNAME.eq("Doe"))
  	.print();
}	

This will output:

SELECT * FROM `persons` WHERE `persons`.`lastname` = 'Doe'

To get the SQL-statement as a string, call build() instead of print()

Some other examples:

Insert:

Queries.insertInto(PERSONS)
	.set(FORENAME, "John")
	.set(LASTNAME, "Doe")
	.print();

INSERT INTO `persons` SET `persons`.`forename` = 'John', `persons`.`lastname` = 'Doe'

Update:

Queries.update(PERSONS)
	.set(FORENAME, "John")
	.where(LASTNAME.eq("Doe"))
	.print();

UPDATE `persons` SET `persons`.`forename` = 'John', WHERE `persons`.`lastname` = 'Doe'

Delete:

Queries.deleteFrom(PERSONS)
	.where(LASTNAME.eq("Doe"))
	.print();

DELETE FROM `persons` WHERE `persons`.`lastname` = 'Doe'

Create table:

Queries.createTable(PERSONS).println()

CREATE TABLE `persons` (`forename` VARCHAR(50) DEFAULT NULL, `lastname` VARCHAR(50) DEFAULT NULL)

Features

• Build SQL-queries in different dialects, currently supported are:

  • MySQL
  • Sybase

• Currently supported queries are:

  • SELECT
  • INSERT
  • UPDATE
  • DELETE
  • CREATE TABLE

• Type-safe query-building. Currently supported column-datatypes are:

  • CHAR, VARCHAR, TEXT
  • INT, BIGINT, MEDIUMINT, SMALLINT, TINYINT
  • DOUBLE, FLOAT, DECIMAL
  • DATE, DATETIME

• Supports SQL-Functions, currently supported are:

  • SUM
  • MIN
  • MAX
  • AVG
  • COUNT
  • NOW

• Build queries with or without indentation

Choose dialect

By default the MySQL-dialect is chosen. To change the dialect, you can pass your wanted dialect to the print() or build()-method. The known dialects are collected in the Utility-Class Dialects. Simple example for choose the known Sybase-dialect:

Queries.select()
  .from(PERSONS)
  .limit(100, 10)
  .print(Dialects.SYBASE);

This will output:

SELECT TOP 100 START AT 11 * FROM `persons`

It is also possible to globally change the default-Dialect. To do so, set the system-property sqlbuilder.defaultDialect to the name of the Dialect you want.

Indentation

Just add Indentation.enabled() to the print() or build()-method as follows:

Queries.select()
  .from(PERSONS)
  .where(LASTNAME.eq("Doe"))
  .print(Indentation.enabled());

This will output:

SELECT
  *
FROM
  `persons`
WHERE `persons`.`lastname` = 'Doe'