SQLite dialect for Hibernate

SQLiteDialect.java

/*
 * The author disclaims copyright to this source code.  In place of
 * a legal notice, here is a blessing:
 * 
 *    May you do good and not evil.
 *    May you find forgiveness for yourself and forgive others.
 *    May you share freely, never taking more than you give.
 *
 */
package org.hibernate.dialect;

import java.sql.Types;

import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.Hibernate;

public class SQLiteDialect extends Dialect {
  public SQLiteDialect() {
    registerColumnType(Types.BIT, "integer");
    registerColumnType(Types.TINYINT, "tinyint");
    registerColumnType(Types.SMALLINT, "smallint");
    registerColumnType(Types.INTEGER, "integer");
    registerColumnType(Types.BIGINT, "bigint");
    registerColumnType(Types.FLOAT, "float");
    registerColumnType(Types.REAL, "real");
    registerColumnType(Types.DOUBLE, "double");
    registerColumnType(Types.NUMERIC, "numeric");
    registerColumnType(Types.DECIMAL, "decimal");
    registerColumnType(Types.CHAR, "char");
    registerColumnType(Types.VARCHAR, "varchar");
    registerColumnType(Types.LONGVARCHAR, "longvarchar");
    registerColumnType(Types.DATE, "date");
    registerColumnType(Types.TIME, "time");
    registerColumnType(Types.TIMESTAMP, "timestamp");
    registerColumnType(Types.BINARY, "blob");
    registerColumnType(Types.VARBINARY, "blob");
    registerColumnType(Types.LONGVARBINARY, "blob");
    // registerColumnType(Types.NULL, "null");
    registerColumnType(Types.BLOB, "blob");
    registerColumnType(Types.CLOB, "clob");
    registerColumnType(Types.BOOLEAN, "integer");

    registerFunction( "concat", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "") );
    registerFunction( "mod", new SQLFunctionTemplate( Hibernate.INTEGER, "?1 % ?2" ) );
    registerFunction( "substr", new StandardSQLFunction("substr", Hibernate.STRING) );
    registerFunction( "substring", new StandardSQLFunction( "substr", Hibernate.STRING ) );
  }

  public boolean supportsIdentityColumns() {
    return true;
  }

  /*
  public boolean supportsInsertSelectIdentity() {
    return true; // As specify in NHibernate dialect
  }
  */

  public boolean hasDataTypeInIdentityColumn() {
    return false; // As specify in NHibernate dialect
  }

  /*
  public String appendIdentitySelectToInsert(String insertString) {
    return new StringBuffer(insertString.length()+30). // As specify in NHibernate dialect
      append(insertString).
      append("; ").append(getIdentitySelectString()).
      toString();
  }
  */

  public String getIdentityColumnString() {
    // return "integer primary key autoincrement";
    return "integer";
  }

  public String getIdentitySelectString() {
    return "select last_insert_rowid()";
  }

  public boolean supportsLimit() {
    return true;
  }

  protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
      append(query).
      append(hasOffset ? " limit ? offset ?" : " limit ?").
      toString();
  }

  public boolean supportsTemporaryTables() {
    return true;
  }

  public String getCreateTemporaryTableString() {
    return "create temporary table if not exists";
  }

  public boolean dropTemporaryTableAfterUse() {
    return false;
  }

  public boolean supportsCurrentTimestampSelection() {
    return true;
  }

  public boolean isCurrentTimestampSelectStringCallable() {
    return false;
  }

  public String getCurrentTimestampSelectString() {
    return "select current_timestamp";
  }

  public boolean supportsUnionAll() {
    return true;
  }

  public boolean hasAlterTable() {
    return false; // As specify in NHibernate dialect
  }

  public boolean dropConstraints() {
    return false;
  }

  public String getAddColumnString() {
    return "add column";
  }

  public String getForUpdateString() {
    return "";
  }

  public boolean supportsOuterJoinForUpdate() {
    return false;
  }

  public String getDropForeignKeyString() {
    throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
  }

  public String getAddForeignKeyConstraintString(String constraintName,
      String[] foreignKey, String referencedTable, String[] primaryKey,
      boolean referencesPrimaryKey) {
    throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
  }

  public String getAddPrimaryKeyConstraintString(String constraintName) {
    throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
  }

  public boolean supportsIfExistsBeforeTableName() {
    return true;
  }

  public boolean supportsCascadeDelete() {
    return false;
  }
}

Small review on SQLite dialects:

Hibernate 3

https://github.com/kemitix/sqlite-dialect

<dependency>
    <groupId>net.kemitix</groupId>
    <artifactId>sqlite-dialect</artifactId>
    <version>0.1.0</version>
</dependency>  

Hibernate 4

https://github.com/EnigmaBridge/hibernate4-sqlite-dialect

<dependency>
    <groupId>com.enigmabridge</groupId>
    <artifactId>hibernate4-sqlite-dialect</artifactId>
    <version>0.1.2</version>
</dependency>

Note: Mine repo. Based on the gwenn repo.

Hibernate 5

https://github.com/gwenn/sqlite-dialect/

Not yet added to the maven central repository. Author works with Hibernate team to integrate it to the Hibernate directly.

For anybody interested, this Dialect that user virasak has posted is actually the first commit of user gwenn's repository https://github.com/gwenn/sqlite-dialect/ which dates back to at least January 2009, if not earlier on. (Gwenn has put a line in the README.md file that says the repository was first posted in March 2008.) Gwenn has been licensing this Dialect under the Unlicense http://unlicense.org/

I wonder why the developers of Hibernate haven't implemented this Dialect...

I found a bug when using org.springframework.data.jpa.repository.JpaRepository.findAll(Pageable).
So I fixed the getLimitString method.

Before:

  protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
      append(query).
      append(hasOffset ? " limit ? offset ?" : " limit ?").
      toString();
  }

After:

  protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
      append(query).
      append(hasOffset ? " limit ?, ?" : " limit ?").
      toString();
  }

I found a bug when using org.springframework.data.jpa.repository.JpaRepository.findAll(Pageable).
So I fixed the getLimitString method.

Before:

  protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
      append(query).
      append(hasOffset ? " limit ? offset ?" : " limit ?").
      toString();
  }

After:

  protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
      append(query).
      append(hasOffset ? " limit ?, ?" : " limit ?").
      toString();
  }

You can also add:

    @Override
    public boolean bindLimitParametersInReverseOrder() {
        return true;
    }