MEDIUMINT3 Bytes(-8 388 608，8 388 607)(0，16 777 215)大整数值 INT或INTEGER4 Bytes(-2 147...
然后来看下 Binlog 中的记录：#200715 17:28:28 server id 15218 end_log_pos 400 CRC32 0xe4dedec0 Update_rows: table id 4034114356 flags: STMT_END_F### UPDATE `test`.`t20200709`### WHERE### @1=1 /* INT meta=0 nullable=0 is_null=0 */### @2='name4' /* VARSTRI...
[]byte --> MYSQL_TYPE_VAR_STRING int8, uint8 --> MYSQL_TYPE_TINY int16, uint16 --> MYSQL_TYPE_SHORT int32, uint32 --> MYSQL_TYPE_LONG int64, uint64 --> MYSQL_TYPE_LONGLONG int, uint --> protocol integer type which match size of int bool --> MYSQL_TYPE_TINY float32 -->...
50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/; /*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*...
以下用法也是可行的: mysql>SELECT*FROM tbl_name WHERE set_col&1;mysql>SELECT*FROM tbl_name WHERE set_col ='val1,val2'; 相关资源 MySQL Reference Manual - String Types The MySQL SET Datatype
`bug43055` Type: VAR_STRING Collation: latin1_swedish_ci (8) Length: 50 Max_length: 38 Decimals: 0 Flags: NOT_NULL PRI_KEY NO_DEFAULT_VALUE PART_KEY Field 2: `Class` Catalog: `def` Database: `test` Table: `bug43055` Org_table: `bug43055` Type: BLOB Collation: latin1_swedish_...
`tbl_test` Type: DATETIME Collation: binary (63) Length: 19 Max_length: 19 Decimals: 0 Flags: NOT_NULL BINARY NO_DEFAULT_VALUE Field 2: `a` Catalog: `def` Database: `` Table: `` Org_table: `` Type: VAR_STRING Collation: utf8mb4_0900_ai_ci (255) Length: 72 Max_length: 13...
Packet Length:28Packet Number:2Catalog:defDatabase:Table:Original table:Name:USER()Original name:Charset number:utf8mb4COLLATEutf8mb4_general_ci(45)Length:308Type:FIELD_TYPE_VAR_STRING(253)Flags:0x0001Decimals:31MySQL Protocol Packet Length:5Packet Number:3EOFmarker:254Warnings:0Server Status:0x...
MULTILINESTRING MULTIPOLYGON 实现类继承了 Field_blob 的字段类型中,JSON 类型的实现类为Field_json,其它 8 种类型都是空间类型(spatial type),其实现类为Field_geom。 Field_blob、Field_json、Field_geom 承载了 17 个字段类型的实现,那 MySQL 怎么区分这 3 个类实例化之后,到底对应着哪种类型的字段呢?
3>.其实char(#number),var(#number),binary(#number),varbinary(#number)它们的存储数据的大小是有上限的。如果你写博客,里面的正文数据长度一定是很大的。这个时候这四种定义类型就不再合适了,这个时候就有了面向对象存储的概念,就是不讲数据放在一个表中了,而是将数据放在一个指定的文件,而在表中存储的只是一...