ColumnDefinitionFactory (MySQL Connector/J Bug Fixed 8.0.20 API)

java.lang.Object
- com.mysql.cj.protocol.a.ColumnDefinitionFactory

所有已实现的接口:

ProtocolEntityFactory<ColumnDefinition,NativePacketPayload>

直接已知子类:

MergingColumnDefinitionFactory
```
public class ColumnDefinitionFactory
extends Object
implements ProtocolEntityFactory<ColumnDefinition,NativePacketPayload>
```

字段概要

字段
修饰符和类型字段说明

protected long columnCount

protected ColumnDefinition columnDefinitionFromCache

构造器概要

构造器
构造器说明

ColumnDefinitionFactory(long columnCount, ColumnDefinition columnDefinitionFromCache)

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`ColumnDefinition`	`createFromFields(Field[] fields)`
`ColumnDefinition`	`createFromMessage(NativePacketPayload packetPayload)`	Create ProtocolEntity of type `ProtocolEntityFactory` from protocol message.
`long`	`getColumnCount()`
`ColumnDefinition`	`getColumnDefinitionFromCache()`
`boolean`	`mergeColumnDefinitions()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 com.mysql.cj.protocol.ProtocolEntityFactory
createFromProtocolEntity, getFetchSize, getResultSetConcurrency, getResultSetType

字段详细资料

columnCount
```
protected long columnCount
```

columnDefinitionFromCache

protected ColumnDefinition columnDefinitionFromCache

构造器详细资料

ColumnDefinitionFactory

public ColumnDefinitionFactory(long columnCount,
                               ColumnDefinition columnDefinitionFromCache)

方法详细资料
- getColumnCount
```
public long getColumnCount()
```
- getColumnDefinitionFromCache
```
public ColumnDefinition getColumnDefinitionFromCache()
```
- createFromMessage
```
public ColumnDefinition createFromMessage(NativePacketPayload packetPayload)
```
  从接口复制的说明: ProtocolEntityFactory
  
  Create ProtocolEntity of type ProtocolEntityFactory from protocol message.
  
  指定者:
  
  createFromMessage 在接口中 ProtocolEntityFactory<ColumnDefinition,NativePacketPayload>
  
  参数:
  
  packetPayload - Message instance
  
  返回:
  
  T
- mergeColumnDefinitions
```
public boolean mergeColumnDefinitions()
```
- createFromFields
```
public ColumnDefinition createFromFields(Field[] fields)
```