ColumnWithTransform

A class that handles the transformation between a source column type and a target type.

ColumnWithTransform extends ColumnType and can be used to define columns.

It does not apply transformations to null values. null values are passed directly to the delegated column type. If you need to transform null values, use NullableColumnWithTransform instead.

Parameters

Wrapped

The type to which the column value of type Unwrapped is transformed

Unwrapped

The type of the column

delegate

The original column's IColumnType

transformer

Instance of ColumnTransformer that makes actual data transformation

Inheritors

Constructors

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constructor(delegate: IColumnType<Unwrapped & Any>, transformer: ColumnTransformer<Unwrapped, Wrapped>)

Properties

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Returns true if this is an auto-increment column, false otherwise.

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open override var nullable: Boolean

Returns true if the column type is nullable, false otherwise.

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Gets the original column type that this column with transformation wraps around.

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Functions

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open operator override fun equals(other: Any?): Boolean
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open override fun hashCode(): Int
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Returns the String representation of the specified non-null value when value is set as the default for the column.

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Returns the SQL representation of the specified non-null value, for this column type.

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open override fun notNullValueToDB(value: Wrapped & Any): Any

Returns an object compatible with the database, from the specified non-null value, for this column type.

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open fun parameterMarker(value: Wrapped?): String

Defines the appearance of parameter markers in prepared SQL statements.

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open fun readObject(rs: ResultSet, index: Int): Any?

Returns the object at the specified index in the rs.

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open override fun setParameter(stmt: PreparedStatementApi, index: Int, value: Any?)

Sets the value at the specified index into the stmt.

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open override fun sqlType(): String

Returns the SQL type of this column.

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open override fun toString(): String
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open fun unwrapRecursive(value: Wrapped?): Any?

Recursively unwraps the given value by applying the delegate's transformation.

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Function checks that provided value is suites the column type and throws IllegalArgumentException otherwise. value can be of any type (including Expression)

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Returns the String representation of the specified value when value is set as the default for the column. If the value is null and the column is not nullable, an exception will be thrown. Used for metadata default value comparison.

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open override fun valueFromDB(value: Any): Wrapped?

Converts the specified value (from the database) to an object of the appropriated type, for this column type. Default implementation returns the same instance.

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open override fun valueToDB(value: Wrapped?): Any?

Returns an object compatible with the database, from the specified value, for this column type.

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open fun valueToString(value: Wrapped?): String

Returns the SQL representation of the specified value, for this column type. If the value is null and the column is not nullable, an exception will be thrown. Used when generating an SQL statement and when logging that statement.