http://docs.jboss.org/hibernate/orm/3.6/reference/en-US/html/types.html#types-value-basic
6.1.1.3. java.lang.Boolean (or boolean primitive)
org.hibernate.type.BooleanType
Maps a boolean to a JDBC BIT type
Registered under boolean and java.lang.Boolean in the type registry (see Section 6.5, “Type registry”).
org.hibernate.type.NumericBooleanType
Maps a boolean to a JDBC INTEGER type as 0 = false, 1 = true
Registered under numeric_boolean in the type registry (see Section 6.5, “Type registry”).
org.hibernate.type.YesNoType
Maps a boolean to a JDBC CHAR type as ('N' | 'n') = false, ( 'Y' | 'y' ) = true
Registered under yes_no in the type registry (see Section 6.5, “Type registry”).
org.hibernate.type.TrueFalseType
Maps a boolean to a JDBC CHAR type as ('F' | 'f') = false, ( 'T' | 't' ) = true
Registered under true_false in the type registry (see Section 6.5, “Type registry”).
<class name="xxxx" table="xx_xx_CONFIG">
<id name="id" type="java.lang.Long">
<column name="ID" precision="22" />
<generator class="sequence">
<param name="sequence">SEQ_MAILTARGET_CONFIG</param>
</generator>
</id>
<property name="sended" type="org.hibernate.type.NumericBooleanType">
<column name="ISSENDED" />
</property>
</class>