Long型id数据对应MySQL数据库中 bigint 数据类型;
System.out.println(1==1L); //ture
System.out.println(1L); //1
System.out.println(1L+"2"); //12
java类 mysql数据库
java.lang.Byte byte TINYINT
java.lang.Short short SMALLINT
java.lang.Integer integer INGEGER
java.lang.Long long BIGINT
java.lang.Float float FLOAT
java.lang.Double double DOUBLE
java.lang.BigDecimal big_decimal NUMERIC
java.lang.Boolean boolean BIT
java.lang.String string VARCHAR
java.lang.Boolean yes_no CHAR(1)(Y或N)
java.lang.Boolean true_false CHAR(1)(‘Y’或N)
java.uitl.Date / java.sql.Date date DATE
java.sql.Time time TIME
java.sql.Timestamp timestamp TIMESTAMP
java.uitl.Calendar celendar TIMESTAMP
java.uitl.Calendar calendar TIMESTAMP
java.io.Serializable serializable VARBINARY/BLOB
java.sql.Clob clob CLOB
java.sql.Blob blob BLOB
java.lang.Class class VARCHAR
java.uitl.Locale locale VARCHAR
java.uitl.TimeZone timezone VARCHAR
java.uitl.Currency currency VARCHAR