问题描述
我们不想将密码存储在 Hibernate 实体类的 String 变量中，而是希望将其存储在 char[] 数组中，以便在使用后可以清空该数组。因此，我们正在减少 Heap 检查的机会。
需要你的建议。
DB 列中的密码字段 - VARCHAR
Java-Hibernate 实体中的密码字段 - String（当前 s/m）
我们可以在 Java-Hiberante 实体中使用 Char[] 代替 String 吗？
解决方法
Hibernate 将 String 和char[] 映射到 VARCHAR，因为它们是基本数据类型。有关详细信息，请参阅文档 Hibernate-provided BasicTypes
表 3.1。标准基本类型
Hibernate type (org.hibernate.type package) JDBC type Java type BasicTypeRegistry key(s) StringType VARCHAR java.lang.String string,java.lang.String MaterializedClob CLOB java.lang.String materialized_clob TextType LONGVARCHAR java.lang.String text CharacterType CHAR char,java.lang.Character char,java.lang.Character BooleanType BIT boolean,java.lang.Boolean boolean,java.lang.Boolean NumericBooleanType INTEGER,0 is false,1 is true boolean,java.lang.Boolean numeric_boolean YesNoType CHAR,'N'/'n' is false,'Y'/'y' is true. The uppercase value is written to the database. boolean,java.lang.Boolean yes_no TrueFalseType CHAR,'F'/'f' is false,'T'/'t' is true. The uppercase value is written to the database. boolean,java.lang.Boolean true_false ByteType TINYINT byte,java.lang.Byte byte,java.lang.Byte ShortType SMALLINT short,java.lang.Short short,java.lang.Short IntegerTypes INTEGER int,java.lang.Integer int,java.lang.Integer LongType BIGINT long,java.lang.Long long,java.lang.Long FloatType FLOAT float,java.lang.Float float,java.lang.Float DoubleType DOUBLE double,java.lang.Double double,java.lang.Double BigIntegerType NUMERIC java.math.BigInteger big_integer,java.math.BigInteger BigDecimalType NUMERIC java.math.BigDecimal big_decimal,java.math.bigDecimal TimestampType TIMESTAMP java.sql.Timestamp timestamp,java.sql.Timestamp TimeType TIME java.sql.Time time,java.sql.Time DateType DATE java.sql.Date date,java.sql.Date CalendarType TIMESTAMP java.util.Calendar calendar,java.util.Calendar CalendarDateType DATE java.util.Calendar calendar_date CurrencyType java.util.Currency VARCHAR currency,java.util.Currency LocaleType VARCHAR java.util.Locale locale,java.utility.locale TimeZoneType VARCHAR,using the TimeZone ID java.util.TimeZone timezone,java.util.TimeZone UrlType VARCHAR java.net.URL url,java.net.URL ClassType VARCHAR (class FQN) java.lang.Class class,java.lang.Class BlobType BLOB java.sql.Blob blog,java.sql.Blob ClobType CLOB java.sql.Clob clob,java.sql.Clob BinaryType VARBINARY byte[] binary,byte[] MaterializedBlobType BLOB byte[] materized_blob ImageType LONGVARBINARY byte[] image WrapperBinaryType VARBINARY java.lang.Byte[] wrapper-binary,Byte[],java.lang.Byte[] CharArrayType VARCHAR char[] characters,char[] CharacterArrayType VARCHAR java.lang.Character[] wrapper-characters,Character[],java.lang.Character[] UUIDBinaryType BINARY java.util.UUID uuid-binary,java.util.UUID UUIDCharType CHAR,can also read VARCHAR java.util.UUID uuid-char PostgresUUIDType PostgreSQL UUID,through Types#OTHER,which complies to the PostgreSQL JDBC driver definition java.util.UUID pg-uuid SerializableType VARBINARY implementors of java.lang.Serializable Unlike the other value types,multiple instances of this type are registered. It is registered once under java.io.Serializable,and registered under the specific java.io.Serializable implementation class names. StringNVarcharType NVARCHAR java.lang.String nstring NTextType LONGNVARCHAR java.lang.String ntext NClobType NCLOB java.sql.NClob nclob,java.sql.NClob MaterializedNClobType NCLOB java.lang.String materialized_nclob PrimitiveCharacterArrayNClobType NCHAR char[] N/A CharacterNCharType NCHAR java.lang.Character ncharacter CharacterArrayNClobType NCLOB java.lang.Character[] N/A