Structure
SQLColumnAssignment
Encapsulates a
column_name=value expression in the context of an UPDATE query’s value assignment list. This is distinct from an SQLBinaryExpression using the .equal operator in that the left side must be an unqualified column name, the operator must be =, and the right side may use SQLExcludedColumn when the assignment appears in the assignments list of a SQLConflictAction.update(assignments:predicate:) specification.struct SQLColumnAssignmentTopics
Initializers
init(setting:to:)Create a column assignment from a column name and value binding.init(settingExcludedValueFor:)Create a column assignment from a column identifier and using the excluded value from an upsert’s values list.
Instance Properties
var columnName: any SQLExpressionThe name of the column to assign.var value: any SQLExpressionThe value to assign.
Instance Methods
func serialize(to: inout SQLSerializer)Invoked when a request is made to serialize the expression to raw SQL.
Relationships
Conforms To
SQLExpressionSwift.SendableSwift.SendableMetatype
See Also
Clause Expressions
struct SQLAlterColumnDefinitionTypeA clause specifying a new data type to be applied to an existing column.enum SQLColumnConstraintAlgorithmColumn-level data constraints.struct SQLColumnDefinitionA clause expressing a column definition, for use when creating and altering tables.struct SQLCommonTableExpressionA clause describing a single Common Table Expressions, which in itws simplest form provides additional data to a primary query in the same way as joining to a subquery.struct SQLCommonTableExpressionGroupA clause representing a group of one or moreSQLCommonTableExpressions.enum SQLConflictActionAn action to take when anINSERTquery encounters a unique constraint violation.struct SQLConflictResolutionStrategySpecifies a conflict resolution strategy and associated conditions for anINSERTquery. AnINSERTwith a conflict strategy is often refered to as anUPSERT(“insert or update”). Databases are not required to support any given subset of upsert functionality, or any at all.enum SQLDropBehaviorSpecifies a behavior when performing aDROPoperation on a database object which is referenced by other objects.struct SQLEnumDataTypeRepresents a data type which specifies an enumeration in the database.struct SQLExcludedColumnAn expression appearing on the right side of a column assignment which, when the assignment list is part of an upsert’s update acion, refers to the value which was originally to be inserted for the given column.struct SQLForeignKeyA completeFOREIGN KEYconstraint specification.struct SQLInsertModifierSimple helper for working around MySQL’s refusal to implement standard SQL. Only emits SQL when needed.struct SQLJoinEncapsulates a single SQLJOIN, specifying the join type, the right-side table, and condition.enum SQLJoinMethodThe method used by a table join clause.enum SQLLockingClauseAn SQL locking clause.