java.lang.Object
- org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter
- - org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor

所有已实现的接口:
NativeJdbcExtractor
```
public class SimpleNativeJdbcExtractor
extends NativeJdbcExtractorAdapter
```
A simple implementation of the NativeJdbcExtractor interface. Assumes a pool that wraps Connection handles but not DatabaseMetaData: In this case, the underlying native Connection can be retrieved by simply calling conHandle.getMetaData().getConnection(). All other JDBC objects will be returned as passed in.
This extractor should work with any pool that does not wrap DatabaseMetaData, and will also work with any plain JDBC driver. Note that a pool can still wrap Statements, PreparedStatements, etc: The only requirement of this extractor is that java.sql.DatabaseMetaData does not get wrapped, returning the native Connection of the JDBC driver on metaData.getConnection().
Customize this extractor by setting the "nativeConnectionNecessaryForXxx" flags accordingly: If Statements, PreparedStatements, and/or CallableStatements are wrapped by your pool, set the corresponding "nativeConnectionNecessaryForXxx" flags to "true". If none of the statement types is wrapped - or you solely need Connection unwrapping in the first place -, the defaults are fine.
SimpleNativeJdbcExtractor is a common choice for use with OracleLobHandler, which just needs Connection unwrapping via the NativeJdbcExtractorAdapter.getNativeConnectionFromStatement(java.sql.Statement) method. This usage will work with almost any connection pool.
For full usage with JdbcTemplate, i.e. to also provide Statement unwrapping:
- Use a default SimpleNativeJdbcExtractor for Resin and SJSAS (no JDBC Statement objects are wrapped, therefore no special unwrapping is necessary).
- Use a SimpleNativeJdbcExtractor with all "nativeConnectionNecessaryForXxx" flags set to "true" for C3P0 (all JDBC Statement objects are wrapped, but none of the wrappers allow for unwrapping).
- Use a CommonsDbcpNativeJdbcExtractor for Apache Commons DBCP or a JBossNativeJdbcExtractor for JBoss (all JDBC Statement objects are wrapped, but all of them can be extracted by casting to implementation classes).
从以下版本开始:
05.12.2003
作者:
Juergen Hoeller
另请参阅:
setNativeConnectionNecessaryForNativeStatements(boolean), setNativeConnectionNecessaryForNativePreparedStatements(boolean), setNativeConnectionNecessaryForNativeCallableStatements(boolean), Jdbc4NativeJdbcExtractor, JdbcTemplate.setNativeJdbcExtractor(org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor), OracleLobHandler.setNativeJdbcExtractor(org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor)

构造器概要
构造器
构造器说明
SimpleNativeJdbcExtractor()

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
`boolean`	`isNativeConnectionNecessaryForNativeCallableStatements()`	Return `false` by default.
`boolean`	`isNativeConnectionNecessaryForNativePreparedStatements()`	Return `false` by default.
`boolean`	`isNativeConnectionNecessaryForNativeStatements()`	Return `false` by default.
`void`	`setNativeConnectionNecessaryForNativeCallableStatements(boolean nativeConnectionNecessary)`	Set whether it is necessary to work on the native Connection to receive native CallableStatements.
`void`	`setNativeConnectionNecessaryForNativePreparedStatements(boolean nativeConnectionNecessary)`	Set whether it is necessary to work on the native Connection to receive native PreparedStatements.
`void`	`setNativeConnectionNecessaryForNativeStatements(boolean nativeConnectionNecessaryForNativeStatements)`	Set whether it is necessary to work on the native Connection to receive native Statements.

从类继承的方法 org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter
doGetNativeConnection, getNativeCallableStatement, getNativeConnection, getNativeConnectionFromStatement, getNativePreparedStatement, getNativeResultSet, getNativeStatement

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

- 构造器详细资料
  - SimpleNativeJdbcExtractor
```
public SimpleNativeJdbcExtractor()
```
- 方法详细资料
  - setNativeConnectionNecessaryForNativeStatements
```
public void setNativeConnectionNecessaryForNativeStatements(boolean nativeConnectionNecessaryForNativeStatements)
```
    Set whether it is necessary to work on the native Connection to receive native Statements. Default is "false". If true, the Connection will be unwrapped first to create a Statement.
    This makes sense if you need to work with native Statements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on DatabaseMetaData.getConnection.
    The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps Statements.
    另请参阅:
    Connection.createStatement(), DatabaseMetaData.getConnection()
  - isNativeConnectionNecessaryForNativeStatements
```
public boolean isNativeConnectionNecessaryForNativeStatements()
```
    从类复制的说明: NativeJdbcExtractorAdapter
    Return false by default.
    指定者:
    isNativeConnectionNecessaryForNativeStatements 在接口中 NativeJdbcExtractor
    覆盖:
    isNativeConnectionNecessaryForNativeStatements 在类中 NativeJdbcExtractorAdapter
  - setNativeConnectionNecessaryForNativePreparedStatements
```
public void setNativeConnectionNecessaryForNativePreparedStatements(boolean nativeConnectionNecessary)
```
    Set whether it is necessary to work on the native Connection to receive native PreparedStatements. Default is "false". If true, the Connection will be unwrapped first to create a PreparedStatement.
    This makes sense if you need to work with native PreparedStatements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on Statement.getConnection.
    The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps PreparedStatements.
    另请参阅:
    Connection.prepareStatement(java.lang.String), DatabaseMetaData.getConnection()
  - isNativeConnectionNecessaryForNativePreparedStatements
```
public boolean isNativeConnectionNecessaryForNativePreparedStatements()
```
    从类复制的说明: NativeJdbcExtractorAdapter
    Return false by default.
    指定者:
    isNativeConnectionNecessaryForNativePreparedStatements 在接口中 NativeJdbcExtractor
    覆盖:
    isNativeConnectionNecessaryForNativePreparedStatements 在类中 NativeJdbcExtractorAdapter
  - setNativeConnectionNecessaryForNativeCallableStatements
```
public void setNativeConnectionNecessaryForNativeCallableStatements(boolean nativeConnectionNecessary)
```
    Set whether it is necessary to work on the native Connection to receive native CallableStatements. Default is "false". If true, the Connection will be unwrapped first to create a CallableStatement.
    This makes sense if you need to work with native CallableStatements from a pool that does not allow to extract the native JDBC objects from its wrappers but returns the native Connection on Statement.getConnection.
    The standard SimpleNativeJdbcExtractor is unable to unwrap statements, so set this to true if your connection pool wraps CallableStatements.
    另请参阅:
    Connection.prepareCall(java.lang.String), DatabaseMetaData.getConnection()
  - isNativeConnectionNecessaryForNativeCallableStatements
```
public boolean isNativeConnectionNecessaryForNativeCallableStatements()
```
    从类复制的说明: NativeJdbcExtractorAdapter
    Return false by default.
    指定者:
    isNativeConnectionNecessaryForNativeCallableStatements 在接口中 NativeJdbcExtractor
    覆盖:
    isNativeConnectionNecessaryForNativeCallableStatements 在类中 NativeJdbcExtractorAdapter

类 SimpleNativeJdbcExtractor

构造器概要

方法概要

从类继承的方法 org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter

从类继承的方法 java.lang.Object

构造器详细资料

SimpleNativeJdbcExtractor

方法详细资料

setNativeConnectionNecessaryForNativeStatements

isNativeConnectionNecessaryForNativeStatements

setNativeConnectionNecessaryForNativePreparedStatements

isNativeConnectionNecessaryForNativePreparedStatements

setNativeConnectionNecessaryForNativeCallableStatements

isNativeConnectionNecessaryForNativeCallableStatements