UPDATE Queries

Overview

The UPDATE query is constructed by calling QueryDsl.update and subsequent functions.

If a duplicate key is detected during UPDATE query execution, the org.komapper.core.UniqueConstraintException is thrown.

single

To update a single entity, call the single function:

val address: Address = ..
val query: Query<Address> = QueryDsl.update(a).single(address)
/*
update ADDRESS set STREET = ?, VERSION = ? + 1 where ADDRESS_ID = ? and VERSION = ?
*/

When the above query is executed, the return value is a new entity representing the updated data.

Depending on the mapping definitions shown below, both the SQL and the new entity will reflect the appropriate values.

• @KomapperId
• @KomapperVersion
• @KomapperUpdatedAt

If optimistic locking fails during query execution, the org.komapper.core.OptimisticLockException is thrown.

batch

To update multiple entities in a batch, call the batch function:

val address1: Address = ..
val address2: Address = ..
val address3: Address = ..
val query: Query<List<Address>> = QueryDsl.update(a).batch(address1, address2, address3)
/*
update ADDRESS set STREET = ?, VERSION = ? + 1 where ADDRESS_ID = ? and VERSION = ?
update ADDRESS set STREET = ?, VERSION = ? + 1 where ADDRESS_ID = ? and VERSION = ?
update ADDRESS set STREET = ?, VERSION = ? + 1 where ADDRESS_ID = ? and VERSION = ?
*/

When the above query is executed, the return value is a list of new entities representing the updated data.

Depending on the mapping definitions shown below, both the SQL and the new entities will reflect the appropriate values.

• @KomapperVersion
• @KomapperUpdatedAt

If optimistic locking fails during query execution, the org.komapper.core.OptimisticLockException is thrown.

set

To set a value to specific property, pass a lambda expression to the set function. Within the lambda expression, values can be set to properties using the eq function:

val query: Query<Long> = QueryDsl.update(a).set {
  a.street eq "STREET 16"
}.where {
  a.addressId eq 1
}
/*
update ADDRESS as t0_ set STREET = ? where t0_.ADDRESS_ID = ?
*/

To set a value only if the value is not null, use the eqIfNotNull function:

val query: Query<Long> = QueryDsl.update(e).set {
  e.managerId eqIfNotNull managerId
  e.employeeName eq "test"
}.where {
  e.employeeId eq 1
}

When the above query is executed, the return value is the number of updated rows.

If you do not explicitly call the eq function for properties with the following mapping definitions then the value is automatically set in the generated SQL:

• @KomapperVersion
• @KomapperUpdatedAt

If you explicitly call the eq function for those properties, the explicit value takes precedence.

where

To update rows that match specific criteria, call the where function:

val query: Query<Long> = QueryDsl.update(a).set {
  a.street eq "STREET 16"
}.where {
  a.addressId eq 1
}
/*
update ADDRESS as t0_ set STREET = ? where t0_.ADDRESS_ID = ?
*/

By default, an exception is thrown if a WHERE clause is missing. To intentionally allow updating of all rows, call the options function and set the allowMissingWhereClause property to true:

val query: Query<Long> = QueryDsl.update(e).set {
    e.employeeName eq "ABC"
}.options { 
    it.copy(allowMissingWhereClause = true)
}

When the above query is executed, the return value is the number of updated rows.

options

To customize the behavior of the query, call the options function. The options function accept a lambda expression whose parameter represents default options. Call the copy function on the parameter to change its properties:

val address: Address = ..
val query: Query<Address> = QueryDsl.update(a).single(address).options {
    it.copty(
      queryTimeoutSeconds = 5
    )
}

The options that can be specified are as follows:

allowMissingWhereClause

Whether empty WHERE clauses are allowed or not. Default is false.

escapeSequence

Escape sequence specified for the LIKE predicate. The default is null to indicate the use of Dialect values.

batchSize

Default is null.

disableOptimisticLock

Whether to disable optimistic locking. Default is false. When this value is true, the version number is not included in the WHERE clause.

queryTimeoutSeconds

Query timeout in seconds. Default is null to indicate that the driver value should be used.

suppressLogging

Whether to suppress SQL log output. Default is false.

suppressOptimisticLockException

Whether to suppress the throwing of OptimisticLockException if an attempt to acquire an optimistic lock fails. Default is false.

Properties explicitly set here will be used in preference to properties with the same name that exist in executionOptions.