Grails域类，字符串字段TEXT和LONGTEXT

Question

In a Grails domain class, how do I set the constraint for a String field so that its MySQL column type is TEXT or LONGTEXT?

So far my best approach is to set the constraint's size:

myTextField(size:0..65535)

which results in TEXT

myTextField(size:0..2147483646)

results in LONGTEXT (2147483646 = 2^32 / 2 - 1 - 1)

Is there a cleaner way to specify the size? Basically I want the full range of TEXT or LONGTEXT without having to hardcode a bunch of size values.

Answer 1

You can declare that in the mapping closure of your Domain class:

static mapping = {
   myTextField type: 'text'
}

(See ORM DSL Documentation )

Answer 2

using sqlType would allow you to go for finer grained constraint

Class Foo{
    String myTxtAsVarchar
    String myTxtAsText
    String myTxtAsLtext

    static mapping = {
       myTxtAsVarchar  sqlType: 'varchar(255)'
       myTxtAsText     sqlType: 'text'
       myTxtAsLtext    sqlType: 'longText' 
    }
    /*applying constraint on DB end + on Domain model(scaffolding/Validation)*/
    static constraints = {
           myTxtAsVarchar  size: 2..255
           myTxtAsText     size: 2..15000
     }
}

using SQL type also made available actual Blob type (byte type linked to tinyBlob by default)

more mapping detailed here: https://grails.github.io/grails-doc/latest/ref/Database%20Mapping/column.html