DefaultVTIModDeferPolicy (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.sql.compile.DefaultVTIModDeferPolicy

All Implemented Interfaces:

DeferModification
```
class DefaultVTIModDeferPolicy
extends java.lang.Object
implements DeferModification
```
This class implements the default policy for defering modifications to virtual tables.

Field Summary

Fields
Modifier and Type Field Description

private java.lang.String targetVTIClassName

private boolean VTIResultSetIsSensitive
- Fields inherited from interface org.apache.derby.vti.DeferModification
  DELETE_STATEMENT, INSERT_STATEMENT, UPDATE_STATEMENT

Fields
Modifier and Type	Field	Description
`private java.lang.String`	`targetVTIClassName`
`private boolean`	`VTIResultSetIsSensitive`

Constructor Summary

Constructors
Constructor Description

DefaultVTIModDeferPolicy(java.lang.String targetVTIClassName, boolean VTIResultSetIsSensitive)

Constructors
Constructor	Description
`DefaultVTIModDeferPolicy(java.lang.String targetVTIClassName, boolean VTIResultSetIsSensitive)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`alwaysDefer(int statementType)`	This method is called during preparation of an insert, update, or delete statement with this VTI as the target.
`boolean`	`columnRequiresDefer(int statementType, java.lang.String columnName, boolean inWhereClause)`	This method is called during preparation of an update or delete statement on the virtual table if getResultSetType() returns ResultSet.TYPE_SCROLL_SENSITIVE or TYPE_SCROLL_SENSITIVE and alwaysDefer( statementType) returns false.
`void`	`modificationNotify(int statementType, boolean deferred)`	This VTI method is called by Derby when a VTI modification (insert, update, or delete) is executed.
`boolean`	`subselectRequiresDefer(int statementType, java.lang.String VTIClassName)`	This method is called during preparation of an insert, update, or delete statement that has this virtual table as its target and that has a sub-select.
`boolean`	`subselectRequiresDefer(int statementType, java.lang.String schemaName, java.lang.String tableName)`	This method is called during preparation of an insert, update, or delete statement that has this virtual table as its target and that has a sub-select.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - targetVTIClassName
```
private final java.lang.String targetVTIClassName
```
  - VTIResultSetIsSensitive
```
private final boolean VTIResultSetIsSensitive
```
- Constructor Detail
  - DefaultVTIModDeferPolicy
```
DefaultVTIModDeferPolicy(java.lang.String targetVTIClassName,
                         boolean VTIResultSetIsSensitive)
```
- Method Detail
  - alwaysDefer
```
public boolean alwaysDefer(int statementType)
```
    Description copied from interface: DeferModification
    
    This method is called during preparation of an insert, update, or delete statement with this VTI as the target. It indicates whether the statement should be deferred irregardless of the other clauses in the statement. If alwaysDefer returns true then the other methods in this interface are not called. (At least not for this statement type).
    
    Specified by:
    
    alwaysDefer in interface DeferModification
    
    Parameters:
    
    statementType - One of INSERT_STATEMENT, UPDATE_STATEMENT, DELETE_STATEMENT.
    
    Returns:
    
    true if the statement type should always be deferred on this VTI, false other criteria (see below) should be examined to determine whether to defer the modification.
    
    See Also:
    
    DeferModification.alwaysDefer(int)
  - columnRequiresDefer
```
public boolean columnRequiresDefer(int statementType,
                                   java.lang.String columnName,
                                   boolean inWhereClause)
```
    Description copied from interface: DeferModification
    
    This method is called during preparation of an update or delete statement on the virtual table if getResultSetType() returns ResultSet.TYPE_SCROLL_SENSITIVE or TYPE_SCROLL_SENSITIVE and alwaysDefer( statementType) returns false. ColumnRequiresDefer is called once for each column that is being updated, or each column in a DELETE where clause until it returns true or until all the columns have been exhausted.
    
    Specified by:
    
    columnRequiresDefer in interface DeferModification
    
    Parameters:
    
    statementType - UPDATE_STATEMENT or DELETE_STATEMENT.
    
    columnName - the name of one of the columns being updated
    
    inWhereClause - indicates whether the column also appears in the where clause
    
    Returns:
    
    true if the update must be deferred false if this column does not require a deferred update
    
    See Also:
    
    DeferModification.columnRequiresDefer(int, java.lang.String, boolean)
  - subselectRequiresDefer
```
public boolean subselectRequiresDefer(int statementType,
                                      java.lang.String schemaName,
                                      java.lang.String tableName)
```
    Description copied from interface: DeferModification
    
    This method is called during preparation of an insert, update, or delete statement that has this virtual table as its target and that has a sub-select. It is invoked once for each regular table in a sub-select, if it has not already been determined that the statement should be deferred or that the VTI does not support deferral.
    
    Specified by:
    
    subselectRequiresDefer in interface DeferModification
    
    Parameters:
    
    statementType - the statement type: INSERT_STATEMENT, UPDATE_STATEMENT, or DELETE_STATEMENT.
    
    schemaName - the schema of the table in the sub-select.
    
    tableName - the name of the table in the sub-select.
    
    Returns:
    
    true if the modification must be deferred false if this source table does not necessitate a deferred modification
    
    See Also:
    
    DeferModification.subselectRequiresDefer(int,String,String)
  - subselectRequiresDefer
```
public boolean subselectRequiresDefer(int statementType,
                                      java.lang.String VTIClassName)
```
    Description copied from interface: DeferModification
    
    This method is called during preparation of an insert, update, or delete statement that has this virtual table as its target and that has a sub-select. It is invoked once for each virtual table in the sub-select, if it has not already been determined that the statement should be deferred or that the VTI does not support deferral.
    
    Specified by:
    
    subselectRequiresDefer in interface DeferModification
    
    Parameters:
    
    statementType - the statement type: INSERT_STATEMENT, UPDATE_STATEMENT, or DELETE_STATEMENT.
    
    VTIClassName - the name of the class implementing the VTI in the sub-select.
    
    Returns:
    
    true if the modification must be deferred false if this source table does not necessitate a deferred modification
    
    See Also:
    
    DeferModification.subselectRequiresDefer(int, String)
  - modificationNotify
```
public void modificationNotify(int statementType,
                               boolean deferred)
```
    Description copied from interface: DeferModification
    
    This VTI method is called by Derby when a VTI modification (insert, update, or delete) is executed. It is called after the VTI has been instantiated but before any rows are read, inserted, updated, or deleted.
    
    Specified by:
    
    modificationNotify in interface DeferModification
    
    Parameters:
    
    statementType - one of INSERT_STATEMENT, UPDATE_STATEMENT, or DELETE_STATEMENT
    
    deferred - true if the modification will be deferred, false if not.

Class DefaultVTIModDeferPolicy

Field Summary

Fields inherited from interface org.apache.derby.vti.DeferModification

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

targetVTIClassName

VTIResultSetIsSensitive

Constructor Detail

DefaultVTIModDeferPolicy

Method Detail

alwaysDefer

columnRequiresDefer

subselectRequiresDefer

subselectRequiresDefer

modificationNotify