public InformixDialect() 
{
		super();
		registerColumnType(Types.BIGINT, "int8");
		registerColumnType(Types.BINARY, "byte");
		registerColumnType(Types.BIT, "smallint"); // Informix doesn't have a bit type
		registerColumnType(Types.CHAR, "char($l)");
		registerColumnType(Types.DATE, "date");
		registerColumnType(Types.DECIMAL, "decimal");
        registerColumnType(Types.DOUBLE, "float");
        registerColumnType(Types.FLOAT, "smallfloat");
		registerColumnType(Types.INTEGER, "integer");
		registerColumnType(Types.LONGVARBINARY, "blob"); // or BYTE
		registerColumnType(Types.LONGVARCHAR, "clob"); // or TEXT?
		registerColumnType(Types.NUMERIC, "decimal"); // or MONEY
		registerColumnType(Types.REAL, "smallfloat");
		registerColumnType(Types.SMALLINT, "smallint");
		registerColumnType(Types.TIMESTAMP, "datetime year to fraction(5)");
		registerColumnType(Types.TIME, "datetime hour to second");
		registerColumnType(Types.TINYINT, "smallint");
		registerColumnType(Types.VARBINARY, "byte");
		registerColumnType(Types.VARCHAR, "varchar($l)");
		registerColumnType(Types.VARCHAR, 255, "varchar($l)");
		registerColumnType(Types.VARCHAR, 32739, "lvarchar($l)");
		registerFunction( "concat", new VarArgsSQLFunction( Hibernate.STRING, "(", "||", ")" ) );
}

Creates new InformixDialect instance. Sets up the JDBC / Informix type mappings.

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

 public String getAddForeignKeyConstraintString(String constraintName,
    String[] foreignKey,
    String referencedTable,
    String[] primaryKey,
    boolean referencesPrimaryKey) 
{
		StringBuffer result = new StringBuffer(30);
		result.append(" add constraint ")
			.append(" foreign key (")
			.append( StringHelper.join(", ", foreignKey) )
			.append(") references ")
			.append(referencedTable);
		if(!referencesPrimaryKey) {
			result.append(" (")
			   .append( StringHelper.join(", ", primaryKey) )
			   .append(')");
		}
		result.append(" constraint ").append(constraintName);
			return result.toString();
}

The syntax used to add a foreign key constraint to a table. Informix constraint name must be at the end.

 public String getAddPrimaryKeyConstraintString(String constraintName) 
{
		return " add constraint primary key constraint " + constraintName + " ";
}

The syntax used to add a primary key constraint to a table. Informix constraint name must be at the end.

 public String getCreateSequenceString(String sequenceName) 
{
		return "create sequence " + sequenceName;
}

 public String getCurrentTimestampSelectString() 
{
		return "select distinct current timestamp from informix.systables";
}

 public String getDropSequenceString(String sequenceName) 
{
		return "drop sequence " + sequenceName + " restrict";
}

 public String getIdentityColumnString(int type) throws MappingException 
{
		return type==Types.BIGINT ?
			"serial8 not null" :
			"serial not null";
}

 public String getIdentitySelectString(String table,
    String column,
    int type) throws MappingException 
{
		return type==Types.BIGINT ?
			"select dbinfo('serial8') from systables where tabid=1" :
			"select dbinfo('sqlca.sqlerrd1') from systables where tabid=1";
}

 public String getLimitString(String querySelect,
    int offset,
    int limit) 
{
		if (offset >0) throw new UnsupportedOperationException("informix has no offset");
		return new StringBuffer( querySelect.length()+8 )
			.append(querySelect)
			.insert( querySelect.toLowerCase().indexOf( "select" ) + 6, " first " + limit )
			.toString();
}

 public String getSelectSequenceNextValString(String sequenceName) 
{
		return sequenceName + ".nextval";
}

 public String getSequenceNextValString(String sequenceName) 
{
		return "select " + getSelectSequenceNextValString( sequenceName ) + " from systables where tabid=1";
}

 public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() 
{
        return EXTRACTER;
}

 public boolean hasDataTypeInIdentityColumn() 
{
		return false;
}

 public boolean isCurrentTimestampSelectStringCallable() 
{
		return false;
}

 public boolean supportsCurrentTimestampSelection() 
{
	   
		return true;
}

 public boolean supportsIdentityColumns() 
{
		return true;
}

 public boolean supportsLimit() 
{
		return true;
}

 public boolean supportsLimitOffset() 
{
		return false;
}

 public boolean supportsSequences() 
{
		return true;
}

 public boolean supportsVariableLimit() 
{
		return false;
}

 public boolean useMaxForLimit() 
{
		return true;
}