Foreign key (FK_ must have same number of columns as the referenced primary key

问题

I'm working with a legacy database where Table A consist of 3 composite keys and Table B consist of 2 composite keys which are the same as two of the composite keys from Table A

OnesolPeNames

class OnesolPeNames implements Serializable {

    static mapping = {
        table "ONESOL_pe_names"

        id composite: ["division", "peid"]

        columns{
            division column: 'division', length: 8, sqlType: "char"
            peid column: 'pe_id', length: 12, sqlType: "char"
            peNameU column: 'pe_name_u', length: 50, sqlType: "char"
        }
    }

    static hasMany = [ recoverySetups : RecoverySetup]

    ....

RecoverySetup

class RecoverySetup implements Serializable {

    static mapping = {
        table "recovery_setup"

        id composite: ["division", "peid", "orgkey"]

        columns {
            division column: 'division', length: 10, sqlType: "char"
            peid column: 'peid', length: 12, sqlType: "char"
            orgkey column: 'org_key', length: 8, sqlType: "char"

            oneSolName column: ['division', 'peid']


        }
    }

    static belongsTo = [oneSolName: OnesolPeNames]

    ....

I'm trying to access OnesolPeNames like so.

recoverySetup.onesolPeNames.peNameU.

I'm getting the following error

Caused by MappingException: Foreign key (FK_ib9w9pn893cwi1dkk84qs31bx:recovery_setup [division, peid,onesol_pe_names_division,onesol_pe_names_peid])) must have same number of columns as the referenced primary key (ONESOL_pe_names [division,pe_id])

I'm setting oneSolName column to ['division', 'peid'], where is onesol_pe_names_division,onesol_pe_names_peid coming from?

Could it be that my composite keys are a part of PK but also plays role as a FK which is known as "Derived Identities"?

回答1:

I had a similar issue and I resolved mapping table in this way:

class RecoverySetup implements Serializable {

    static mapping = {
        table "recovery_setup"
        id composite: ["division", "peid", "orgkey"]
        columns {
            orgkey column: 'org_key', length: 8, sqlType: "char"

            oneSolName {
                column name: 'division'
                column name: 'peid'
            }
        }
        oneSolName updateable: false, insertable: false
    }

    static belongsTo = [oneSolName: OnesolPeNames]
    ...
}

来源：https://stackoverflow.com/questions/31167194/foreign-key-fk-must-have-same-number-of-columns-as-the-referenced-primary-key

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