How do I determine the column type name from the columnType integer value in mysql2? - mysql

Question

When querying with mysql2, the third argument to the callback function fields has the following documentation:
console.log(fields); // fields contains extra meta data about results, if available
Ok, great. But when I look at the values in the fields array, I see the following:
[
{
"_buf":{},
"_clientEncoding":"utf8",
"_catalogLength":3,
"_catalogStart":10,
"_schemaLength":0,
"_schemaStart":14,
"_tableLength":11,
"_tableStart":15,
"_orgTableLength":0,
"_orgTableStart":27,
"_orgNameLength":2,
"_orgNameStart":31,
"characterSet":63,
"encoding":"binary",
"name":"id",
"columnLength":11,
"columnType":3, // <-- column type 3? This is an INTEGER field
"flags":1,
"decimals":0
},
{
...
"columnType":253, // <-- column type 253? This is a VARCHAR field
...
}
]
How do I determine what the actual column type is from these integer values?

Answer 1

After doing some more digging, I was able to find the answer by looking at the source. mysql2 exposes a Types field that has the column type names as keys with the column id as values.
At the time of posting, that list looks like this:
{
"DECIMAL": 0,
"TINY": 1,
"SHORT": 2,
"LONG": 3,
"FLOAT": 4,
"DOUBLE": 5,
"NULL": 6,
"TIMESTAMP": 7,
"LONGLONG": 8,
"INT24": 9,
"DATE": 10,
"TIME": 11,
"DATETIME": 12,
"YEAR": 13,
"NEWDATE": 14,
"VARCHAR": 15,
"BIT": 16,
"JSON": 245,
"NEWDECIMAL": 246,
"ENUM": 247,
"SET": 248,
"TINY_BLOB": 249,
"MEDIUM_BLOB": 250,
"LONG_BLOB": 251,
"BLOB": 252,
"VAR_STRING": 253,
"STRING": 254,
"GEOMETRY": 255
}