Updated April 1, 2023
Introduction to Hibernate Dialect
The Language which is used by the databases for communication is called Dialect. Every database has its own dialect, as in, it varies from database to database. For example, the query syntax of Oracle varies with that of MySQL. Hibernate is a database agnostic. It works on varied databases. The language is to be known by Hibernate to generate and translate HQL for execution with the corresponding native query. We need not write SQL queries because Hibernate is independent of databases and thus providing Dialects of databases. Specific databases need specific dialects to convert the query HQL into a specific format.
Syntax:
<name of the property="dialect">;org.hibernate.dialect.MySQLDialect</property>How Hibernate Dialect Works?
org.hibernate.dialect is the package where the dialect is available in Java class. This package helps in mapping the application in java with the database. The package contains a load of dialect classes. These are supported by the framework of hibernate with updated functionalities of all the databases. hibernate.cfg.xml is a file used to interact with a database where defining the required database dialect is done. Any database which a user is using is detected by the hibernate using dialect configuration.
The database of hibernate is independent as we know and it provides dialects of specific databases.
These are a few dialects that hibernate provides.
PostgreSQLDialect, MySQLDialect, OracleDialect, MySQLInnoDBDialect, etc.
Below given is the list of Dialects. There are usually many dialects used throughout. The below given are defined for RDMS in the package org.hibernate.dialect. They are:
| ProgressDialect | An SQL dialect compatible with Progress 9.1C |
| PostgresPlusDialect | An SQL dialect for Postgres Plus |
| Oracle9iDialect | A dialect for Oracle 9i databases. |
| Oracle10gDialect | Oracle 10g is where the dialect is used. |
| MySQLDialect | A dialect for MySQL. |
| MySQLMyISAMDialect | |
| MySQLInnoDBDialect | |
| HSQLDialect.ReadUncommittedLockingStrategy
|
|
| FrontBaseDialect | An SQL Dialect for Frontbase. |
| JDataStoreDialect | A Dialect for JDataStore. |
| PointbaseDialect | A Dialect for Pointbase. |
| DB2 | org.hibernate.dialect.DB2Dialect |
| Pointbase | org.hibernate.dialect.PointbaseDialect |
| FrontBase | org.hibernate.dialect.FrontbaseDialect |
| Firebird | org.hibernate.dialect.FirebirdDialect |
| Mckoi SQL | org.hibernate.dialect.MckoiDialect |
| Teradata | org.hibernate.dialect.Teradata |
| MariaDB | org.hibernate.dialect.MariaDB |
| TimesTen | org.hibernate.dialect.TimesTen |
| Derby version 10.5 | org.hibernate.dialect.DerbyTenFive |
| DB2 AS/400 | org.hibernate.dialect.DB2400Dialect |
| PostgreSQL 8.1 | org.hibernate.dialect.PostgreSQL81Dialect |
| PostgreSQL 8.2 and later | org.hibernate.dialect.PostgreSQL82Dialect |
| MySQL5 | org.hibernate.dialect.MySQL5Dialect |
| MySQL5 with InnoDB | org.hibernate.dialect.MySQL5InnoDBDialect |
| MySQL with MyISAM | org.hibernate.dialect.MySQLMyISAMDialect |
| Oracle (any version) | org.hibernate.dialect.OracleDialect |
| Oracle 9i | org.hibernate.dialect.Oracle9iDialect |
| Oracle 10g | org.hibernate.dialect.Oracle10gDialect |
| Oracle 11g | org.hibernate.dialect.Oracle10gDialect |
| Sybase ASE 15.5 | org.hibernate.dialect.SybaseASE15Dialect |
| Sybase ASE 15.7 | org.hibernate.dialect.SybaseASE157Dialect |
| Microsoft SQL Server 2000 | org.hibernate.dialect.SQLServerDialect |
| Microsoft SQL Server 2005 | org.hibernate.dialect.SQLServer2005Dialect |
| Microsoft SQL Server 2008 | org.hibernate.dialect.SQLServer2008Dialect |
| SAP DB | org.hibernate.dialect.SAPDBDialect |
| Informix | org.hibernate.dialect.InformixDialect |
| HypersonicSQL | org.hibernate.dialect.HSQLDialect |
| H2 Database | org.hibernate.dialect.H2Dialect |
| Ingres | org.hibernate.dialect.IngresDialect |
| Progress | org.hibernate.dialect.ProgressDialect |
| Interbase | org.hibernate.dialect.InterbaseDialect |
| Oracle10g | org.hibernate.dialect.Oracle10gDialect |
| Oracle9i | org.hibernate.dialect.Oracle9iDialect |
| Oracle (any version) | org.hibernate.dialect.OracleDialect |
| MySQL5InnoDBDialect | |
| TeradataDialect | Teradata database dialect. |
| SQLServer2008Dialect | A dialect for Microsoft SQL Server 2008 with JDBC Driver 3.0 and above |
| PostgresPlusDialect | An SQL dialect for Postgres Plus |
| Oracle8iDialect | A dialect for Oracle 8i. |
Examples
Below are the examples:
Code:
@Override
@SuppressWarnings("unchecked")
public String getRenderText(SessionFactoryImplementor sessionFactory) {
final Type type = expectedType == null
? heuristicType
: Number.class.isAssignableFrom( heuristicType.getReturnedClass() )
? heuristicType
: expectedType;
try {
final LiteralType literalType = (LiteralType) type;
final Dialect dialect = factory.getDialect();
return literalType.objectToSQLString( constantValue, dialect );
}
catch (Exception t) {
throw new QueryException( QueryTranslator.ERROR_CANNOT_FORMAT_LITERAL + constantExpression, t );
}
}This is How we Use a Hibernate Dialect with in the configuration file.
Code:
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 5.3//EN"
"<a href="http://www.hibernate.org/dtd/hibernate-configuration-5.3.dtd">http://www.hibernate.org/dtd/hibernate-configuration-5.3.dtd</a>">
<hibernate-configuration>
<session-factory>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name=" connection.driver_class " >oracle.jdbc.driver.OracleDriver< / property >
< property name = " connection.username " >root</property> //write your username
< property name="connection.password">root</property> //write your password
</factory - session >
</hibernate - configuration>Output:
Conclusion
Class of dialect n java class contains a code for mapping between the java data type language and database data type. Dialect abstract class is extended by all the dialect classes. HQL statements are converted to specific database statements using the Dialect hibernate.
Recommended Articles
This is a guide to Hibernate Dialect. Here we discuss how Hibernate Dialect Works and its Examples along with its Code Implementation. You can also go through our other suggested articles to learn more –
