UpdateRequest (DataNucleus RDBMS plugin 6.0.0-m3 API)

java.lang.Object
- org.datanucleus.store.rdbms.request.Request
- - org.datanucleus.store.rdbms.request.UpdateRequest

```
public class UpdateRequest
extends Request
```
Class to provide a means of update of particular fields of a particular type in an RDBMS. Extends basic request class implementing the execute method to do a JDBC update operation. The SQL will be of the form
```
 UPDATE table-name SET param1=?, param2=?[, version=?] WHERE id1=? AND id2=?
 
```
or (when also performing version checks)
```
 UPDATE table-name SET param1=?, param2=?, version={newvers} WHERE id1=? AND id2=? AND version={oldvers}
 
```

Field Summary

Fields
Modifier and Type	Field	Description
`protected org.datanucleus.metadata.AbstractClassMetaData`	`cmd`	MetaData for the class.
`protected boolean`	`versionChecks`	Whether we should make checks on optimistic version before updating.
`protected org.datanucleus.metadata.VersionMetaData`	`versionMetaData`	MetaData for the version handling.

Fields inherited from class org.datanucleus.store.rdbms.request.Request
key, table

Constructor Summary

Constructors
Constructor	Description
`UpdateRequest(DatastoreClass table, org.datanucleus.metadata.AbstractMemberMetaData[] reqFieldMetaData, org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.ClassLoaderResolver clr)`	Constructor, taking the table.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`execute(org.datanucleus.state.DNStateManager sm)`	Method performing the update of the record in the datastore.

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

- Field Detail
  - cmd
```
protected org.datanucleus.metadata.AbstractClassMetaData cmd
```
    MetaData for the class.
  - versionMetaData
```
protected org.datanucleus.metadata.VersionMetaData versionMetaData
```
    MetaData for the version handling.
  - versionChecks
```
protected boolean versionChecks
```
    Whether we should make checks on optimistic version before updating.
- Constructor Detail
  - UpdateRequest
```
public UpdateRequest(DatastoreClass table,
                     org.datanucleus.metadata.AbstractMemberMetaData[] reqFieldMetaData,
                     org.datanucleus.metadata.AbstractClassMetaData cmd,
                     org.datanucleus.ClassLoaderResolver clr)
```
    Constructor, taking the table. Uses the structure of the datastore table to build a basic query.
    
    Parameters:
    
    table - The Class Table representing the datastore table to update
    
    reqFieldMetaData - MetaData of the fields to update
    
    cmd - ClassMetaData of objects being updated
    
    clr - ClassLoader resolver
- Method Detail
  - execute
```
public void execute(org.datanucleus.state.DNStateManager sm)
```
    Method performing the update of the record in the datastore. Takes the constructed update query and populates with the specific record information.
    
    Specified by:
    
    execute in class Request
    
    Parameters:
    
    sm - StateManager for the record to be updated