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Table_map_log_event column types: numerical identifier and metadata

阿新 • • 發佈：2019-02-05

資料搜尋很長時間，原來在程式碼裡，這裡備份下，以供不時之需偷笑

Table_map_log_event column types: numerical identifier and metadata
Name Identifier Size of metadata in bytes Description of metadata
MYSQL_TYPE_DECIMAL 0 0 No column metadata.
MYSQL_TYPE_TINY 1 0 No column metadata.
MYSQL_TYPE_SHORT 2 0 No column metadata.
MYSQL_TYPE_LONG 3 0 No column metadata.
MYSQL_TYPE_FLOAT 4 1 byte 1 byte unsigned integer, representing the "pack_length", which is equal to sizeof(float) on the server from which the event originates.
MYSQL_TYPE_DOUBLE 5 1 byte 1 byte unsigned integer, representing the "pack_length", which is equal to sizeof(double) on the server from which the event originates.
MYSQL_TYPE_NULL 6 0 No column metadata.
MYSQL_TYPE_TIMESTAMP 7 0 No column metadata.
MYSQL_TYPE_LONGLONG 8 0 No column metadata.
MYSQL_TYPE_INT24 9 0 No column metadata.
MYSQL_TYPE_DATE 10 0 No column metadata.
MYSQL_TYPE_TIME 11 0 No column metadata.
MYSQL_TYPE_DATETIME 12 0 No column metadata.
MYSQL_TYPE_YEAR 13 0 No column metadata.
MYSQL_TYPE_NEWDATE 14 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_VARCHAR 15 2 bytes 2 byte unsigned integer representing the maximum length of the string.
MYSQL_TYPE_BIT 16 2 bytes A 1 byte unsigned int representing the length in bits of the bitfield (0 to 64), followed by a 1 byte unsigned int representing the number of bytes occupied by the bitfield. The number of bytes is either int((length+7)/8) or int(length/8).
MYSQL_TYPE_NEWDECIMAL 246 2 bytes A 1 byte unsigned int representing the precision, followed by a 1 byte unsigned int representing the number of decimals.
MYSQL_TYPE_ENUM 247 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_SET 248 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_TINY_BLOB 249 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_MEDIUM_BLOB 250 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_LONG_BLOB 251 – This enumeration value is only used internally and cannot exist in a binlog.
MYSQL_TYPE_BLOB 252 1 byte The pack length, i.e., the number of bytes needed to represent the length of the blob: 1, 2, 3, or 4.
MYSQL_TYPE_VAR_STRING 253 2 bytes This is used to store both strings and enumeration values. The first byte is a enumeration value storing thereal type, which may be either MYSQL_TYPE_VAR_STRING or MYSQL_TYPE_ENUM. The second byte is a 1 byte unsigned integer representing the field size, i.e., the number of bytes needed to store the length of the string.
MYSQL_TYPE_STRING 254 2 bytes The first byte is always MYSQL_TYPE_VAR_STRING (i.e., 253). The second byte is the field size, i.e., the number of bytes in the representation of size of the string: 3 or 4.
MYSQL_TYPE_GEOMETRY 255 1 byte The pack length, i.e., the number of bytes needed to represent the length of the geometry: 1, 2, 3, or 4.

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