# ForeignKeyConstraint

data class ForeignKeyConstraint(val references: Map<Column<*>, Column<*>>, onUpdate: ReferenceOption?, onDelete: ReferenceOption?, name: String?) : DdlAware

Represents a foreign key constraint.

## Constructors

ForeignKeyConstraint
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constructor(references: Map<Column<*>, Column<*>>, onUpdate: ReferenceOption?, onDelete: ReferenceOption?, name: String?)
constructor(target: Column<*>, from: Column<*>, onUpdate: ReferenceOption?, onDelete: ReferenceOption?, name: String?)

## Properties

customFkName
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val customFkName: String?

Custom foreign key name, if provided.

ddl
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open val ddl: List<String>

Returns the list of DDL statements that create this DdlAware instance.

deleteRule
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val deleteRule: ReferenceOption?

Reference option when performing delete operations.

fkName
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val fkName: String

Name of this foreign key constraint.

from
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val from: LinkedHashSet<Column<*>>

The foreign key columns of the referencing child table.

fromTable
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val fromTable: Table

The referencing child table.

fromTableName
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val fromTableName: String

Name of the referencing child table.

references
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val references: Map<Column<*>, Column<*>>

Mapping of the foreign key columns in the referencing child table to their referenced parent table columns.

target
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val target: LinkedHashSet<Column<*>>

The columns of the referenced parent table.

targetTable
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val targetTable: Table

The referenced parent table.

targetTableName
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val targetTableName: String

Name of the referenced parent table.

updateRule
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val updateRule: ReferenceOption?

Reference option when performing update operations.

## Functions

createStatement
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open override fun createStatement(): List<String>

Returns the list of DDL statements that create this object.

dropStatement
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open override fun dropStatement(): List<String>

Returns the list of DDL statements that drops this object.

modifyStatement
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open override fun modifyStatement(): List<String>

Returns the list of DDL statements that modify this object.

plus
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operator fun plus(other: ForeignKeyConstraint): ForeignKeyConstraint
targetOf
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fun targetOf(from: Column<*>): Column<*>?

Returns the parent table column that is referenced by the from column in the child table.

toString
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open override fun toString(): String