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 |
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