IsolationLevelDataSourceAdapter (Spring Framework 4.3.30.RELEASE API)

java.lang.Object
- org.springframework.jdbc.datasource.DelegatingDataSource
- - org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter
  - - org.springframework.jdbc.datasource.IsolationLevelDataSourceAdapter

所有已实现的接口:
Wrapper, CommonDataSource, DataSource, InitializingBean
直接已知子类:
WebSphereDataSourceAdapter
```
public class IsolationLevelDataSourceAdapter
extends UserCredentialsDataSourceAdapter
```
An adapter for a target DataSource, applying the current Spring transaction's isolation level (and potentially specified user credentials) to every getConnection call. Also applies the read-only flag, if specified.
Can be used to proxy a target JNDI DataSource that does not have the desired isolation level (and user credentials) configured. Client code can work with this DataSource as usual, not worrying about such settings.
Inherits the capability to apply specific user credentials from its superclass UserCredentialsDataSourceAdapter; see the latter's javadoc for details on that functionality (e.g. UserCredentialsDataSourceAdapter.setCredentialsForCurrentThread(java.lang.String, java.lang.String)).
WARNING: This adapter simply calls Connection.setTransactionIsolation(int) and/or Connection.setReadOnly(boolean) for every Connection obtained from it. It does, however, not reset those settings; it rather expects the target DataSource to perform such resetting as part of its connection pool handling. Make sure that the target DataSource properly cleans up such transaction state.
从以下版本开始:
2.0.3
作者:
Juergen Hoeller
另请参阅:
setIsolationLevel(int), setIsolationLevelName(java.lang.String), UserCredentialsDataSourceAdapter.setUsername(java.lang.String), UserCredentialsDataSourceAdapter.setPassword(java.lang.String)

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

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
`protected Connection`	`doGetConnection(String username, String password)`	Applies the current isolation level value and read-only flag to the returned Connection.
`protected Integer`	`getCurrentIsolationLevel()`	Determine the current isolation level: either the transaction's isolation level or a statically defined isolation level.
`protected Boolean`	`getCurrentReadOnlyFlag()`	Determine the current read-only flag: by default, the transaction's read-only hint.
`protected Integer`	`getIsolationLevel()`	Return the statically specified isolation level, or `null` if none.
`void`	`setIsolationLevel(int isolationLevel)`	Specify the default isolation level to use for Connection retrieval, according to the JDBC `Connection` constants (equivalent to the corresponding Spring `TransactionDefinition` constants).
`void`	`setIsolationLevelName(String constantName)`	Set the default isolation level by the name of the corresponding constant in `TransactionDefinition`, e.g.

从类继承的方法 org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter
getConnection, getConnection, removeCredentialsFromCurrentThread, setCatalog, setCredentialsForCurrentThread, setPassword, setSchema, setUsername

从类继承的方法 org.springframework.jdbc.datasource.DelegatingDataSource
afterPropertiesSet, getLoginTimeout, getLogWriter, getParentLogger, getTargetDataSource, isWrapperFor, setLoginTimeout, setLogWriter, setTargetDataSource, unwrap

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 javax.sql.CommonDataSource
createShardingKeyBuilder

从接口继承的方法 javax.sql.DataSource
createConnectionBuilder

- 构造器详细资料
  - IsolationLevelDataSourceAdapter
```
public IsolationLevelDataSourceAdapter()
```
- 方法详细资料
  - setIsolationLevelName
```
public final void setIsolationLevelName(String constantName)
                                 throws IllegalArgumentException
```
    Set the default isolation level by the name of the corresponding constant in TransactionDefinition, e.g. "ISOLATION_SERIALIZABLE".
    If not specified, the target DataSource's default will be used. Note that a transaction-specific isolation value will always override any isolation setting specified at the DataSource level.
    参数:
    constantName - name of the constant
    抛出:
    IllegalArgumentException
    另请参阅:
    TransactionDefinition.ISOLATION_READ_UNCOMMITTED, TransactionDefinition.ISOLATION_READ_COMMITTED, TransactionDefinition.ISOLATION_REPEATABLE_READ, TransactionDefinition.ISOLATION_SERIALIZABLE, setIsolationLevel(int)
  - setIsolationLevel
```
public void setIsolationLevel(int isolationLevel)
```
    Specify the default isolation level to use for Connection retrieval, according to the JDBC Connection constants (equivalent to the corresponding Spring TransactionDefinition constants).
    If not specified, the target DataSource's default will be used. Note that a transaction-specific isolation value will always override any isolation setting specified at the DataSource level.
    另请参阅:
    Connection.TRANSACTION_READ_UNCOMMITTED, Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ, Connection.TRANSACTION_SERIALIZABLE, TransactionDefinition.ISOLATION_READ_UNCOMMITTED, TransactionDefinition.ISOLATION_READ_COMMITTED, TransactionDefinition.ISOLATION_REPEATABLE_READ, TransactionDefinition.ISOLATION_SERIALIZABLE, TransactionDefinition.getIsolationLevel(), TransactionSynchronizationManager.getCurrentTransactionIsolationLevel()
  - getIsolationLevel
```
protected Integer getIsolationLevel()
```
    Return the statically specified isolation level, or null if none.
  - doGetConnection
```
protected Connection doGetConnection(String username,
                                     String password)
                              throws SQLException
```
    Applies the current isolation level value and read-only flag to the returned Connection.
    覆盖:
    doGetConnection 在类中 UserCredentialsDataSourceAdapter
    参数:
    username - the username to use
    password - the password to use
    返回:
    the Connection
    抛出:
    SQLException
    另请参阅:
    getCurrentIsolationLevel(), getCurrentReadOnlyFlag()
  - getCurrentIsolationLevel
```
protected Integer getCurrentIsolationLevel()
```
    Determine the current isolation level: either the transaction's isolation level or a statically defined isolation level.
    返回:
    the current isolation level, or null if none
    另请参阅:
    TransactionSynchronizationManager.getCurrentTransactionIsolationLevel(), setIsolationLevel(int)
  - getCurrentReadOnlyFlag
```
protected Boolean getCurrentReadOnlyFlag()
```
    Determine the current read-only flag: by default, the transaction's read-only hint.
    返回:
    whether there is a read-only hint for the current scope
    另请参阅:
    TransactionSynchronizationManager.isCurrentTransactionReadOnly()