CqnStatement (cds4j:api 1.14.0 API)

All Superinterfaces:

JSONizable

All Known Subinterfaces:

CqnDelete, CqnInsert, CqnSelect, CqnUpdate, CqnUpsert, CqnXsert, Delete<T>, Insert, Update<T>, Upsert

All Known Implementing Classes:

Select
```
public interface CqnStatement
extends JSONizable
```

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`void`	`accept(CqnVisitor visitor)`
`default CqnDelete`	`asDelete()` Casts this CQN statement to `CqnDelete`.
`default CqnInsert`	`asInsert()` Casts this CQN statement to `CqnInsert`.
`default CqnSelect`	`asSelect()` Casts this CQN statement to `CqnSelect`.
`default CqnUpdate`	`asUpdate()` Casts this CQN statement to `CqnUpdate`.
`default CqnUpsert`	`asUpsert()` Casts this CQN statement to `CqnUpsert`.
`default boolean`	`isDelete()` Returns `true` if this is a `CqnDelete` statement.
`default boolean`	`isInsert()` Returns `true` if this is a `CqnInsert` statement.
`default boolean`	`isSelect()` Returns `true` if this is a `CqnSelect` statement.
`default boolean`	`isUpdate()` Returns `true` if this is a `CqnUpdate` statement.
`default boolean`	`isUpsert()` Returns `true` if this is a `CqnUpsert` statement.
`CqnStructuredTypeRef`	`ref()` Returns the reference of this statement.

Methods inherited from interface com.sap.cds.JSONizable
toJson

- Method Detail
  - ref
```
CqnStructuredTypeRef ref()
```
    Returns the reference of this statement. CqnSelect statements do not necessarily have a reference, e.g. a select from subquery. This can be checked via CqnSelect.from().
    
    Returns:
    
    the reference
    
    Throws:
    
    CdsException - if this statement does not have a reference
  - accept
```
void accept(CqnVisitor visitor)
```
  - isSelect
```
default boolean isSelect()
```
    Returns true if this is a CqnSelect statement.
    
    Returns:
    
    true if this is a select statement, otherwise false
  - isInsert
```
default boolean isInsert()
```
    Returns true if this is a CqnInsert statement.
    
    Returns:
    
    true if this is an insert statement, otherwise false
  - isUpsert
```
default boolean isUpsert()
```
    Returns true if this is a CqnUpsert statement.
    
    Returns:
    
    true if this is an upsert statement, otherwise false
  - isUpdate
```
default boolean isUpdate()
```
    Returns true if this is a CqnUpdate statement.
    
    Returns:
    
    true if this is an update statement, otherwise false
  - isDelete
```
default boolean isDelete()
```
    Returns true if this is a CqnDelete statement.
    
    Returns:
    
    true if this is a delete statement, otherwise false
  - asSelect
```
default CqnSelect asSelect()
```
    Casts this CQN statement to CqnSelect.
    
    Returns:
    
    this statement as a CqnSelect
    
    Throws:
    
    ClassCastException - if this statement is not a select
  - asInsert
```
default CqnInsert asInsert()
```
    Casts this CQN statement to CqnInsert.
    
    Returns:
    
    this statement as a CqnInsert
    
    Throws:
    
    ClassCastException - if this statement is not an insert
  - asUpsert
```
default CqnUpsert asUpsert()
```
    Casts this CQN statement to CqnUpsert.
    
    Returns:
    
    this statement as a CqnUpsert
    
    Throws:
    
    ClassCastException - if this statement is not an upsert
  - asUpdate
```
default CqnUpdate asUpdate()
```
    Casts this CQN statement to CqnUpdate.
    
    Returns:
    
    this statement as a CqnUpdate
    
    Throws:
    
    ClassCastException - if this statement is not an update
  - asDelete
```
default CqnDelete asDelete()
```
    Casts this CQN statement to CqnDelete.
    
    Returns:
    
    this statement as a CqnDelete
    
    Throws:
    
    ClassCastException - if this statement is not a delete

Interface CqnStatement

Method Summary

Methods inherited from interface com.sap.cds.JSONizable

Method Detail

ref

accept

isSelect

isInsert

isUpsert

isUpdate

isDelete

asSelect

asInsert

asUpsert

asUpdate

asDelete