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net.ymate.platform.persistence.jdbc.JDBC Maven / Gradle / Ivy
/*
* Copyright 2007-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.ymate.platform.persistence.jdbc;
import net.ymate.platform.core.Version;
import net.ymate.platform.core.YMP;
import net.ymate.platform.core.module.IModule;
import net.ymate.platform.core.module.annotation.Module;
import net.ymate.platform.persistence.IDataSourceRouter;
import net.ymate.platform.persistence.jdbc.dialect.IDialect;
import net.ymate.platform.persistence.jdbc.dialect.impl.*;
import net.ymate.platform.persistence.jdbc.impl.*;
import net.ymate.platform.persistence.jdbc.repo.RepoHandler;
import net.ymate.platform.persistence.jdbc.repo.annotation.Repository;
import net.ymate.platform.persistence.jdbc.transaction.Transactions;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.sql.Connection;
import java.util.HashMap;
import java.util.Map;
/**
* 数据库模块管理器
*
* @author 刘镇 ([email protected] ) on 2011-9-10 下午11:45:25
* @version 1.0
*/
@Module
public class JDBC implements IModule, IDatabase {
public static final Version VERSION = new Version(2, 0, 8, JDBC.class.getPackage().getImplementationVersion(), Version.VersionType.Release);
private static final Log _LOG = LogFactory.getLog(JDBC.class);
private static volatile IDatabase __instance;
private YMP __owner;
private IDatabaseModuleCfg __moduleCfg;
private Map __dsCaches;
private boolean __inited;
/**
* @return 返回默认数据库模块管理器实例对象
*/
public static IDatabase get() {
if (__instance == null) {
synchronized (VERSION) {
if (__instance == null) {
__instance = YMP.get().getModule(JDBC.class);
}
}
}
return __instance;
}
/**
* @param owner YMP框架管理器实例
* @return 返回指定YMP框架管理器容器内的数据库模块管理器实例
*/
public static IDatabase get(YMP owner) {
return owner.getModule(JDBC.class);
}
@Override
public String getName() {
return IDatabase.MODULE_NAME;
}
@Override
public void init(YMP owner) throws Exception {
if (!__inited) {
//
_LOG.info("Initializing ymate-platform-persistence-jdbc-" + VERSION);
//
__owner = owner;
__moduleCfg = new DefaultDatabaseModuleCfg(owner);
//
__owner.getEvents().registerEvent(DatabaseEvent.class);
__owner.registerHandler(Repository.class, new RepoHandler(this));
//
__dsCaches = new HashMap();
for (DataSourceCfgMeta _meta : __moduleCfg.getDataSourceCfgs().values()) {
IDataSourceAdapter _adapter = _meta.getAdapterClass().newInstance();
_adapter.initialize(this, _meta);
// 将数据源适配器添加到缓存
__dsCaches.put(_meta.getName(), _adapter);
}
//
__inited = true;
}
}
@Override
public boolean isInited() {
return __inited;
}
@Override
public void destroy() throws Exception {
if (__inited) {
__inited = false;
//
for (IDataSourceAdapter _adapter : __dsCaches.values()) {
_adapter.destroy();
}
__dsCaches = null;
__moduleCfg = null;
__owner = null;
}
}
@Override
public YMP getOwner() {
return __owner;
}
@Override
public IDatabaseModuleCfg getModuleCfg() {
return __moduleCfg;
}
@Override
public IConnectionHolder getDefaultConnectionHolder() throws Exception {
String _defaultDSName = __moduleCfg.getDataSourceDefaultName();
return getConnectionHolder(_defaultDSName);
}
@Override
public IConnectionHolder getConnectionHolder(String dsName) throws Exception {
IConnectionHolder _returnValue;
if (Transactions.get() != null) {
_returnValue = Transactions.get().getConnectionHolder(dsName);
if (_returnValue == null) {
_returnValue = new DefaultConnectionHolder(__dsCaches.get(dsName));
Transactions.get().registerConnectionHolder(_returnValue);
}
} else {
_returnValue = new DefaultConnectionHolder(__dsCaches.get(dsName));
}
return _returnValue;
}
@Override
public void releaseConnectionHolder(IConnectionHolder connectionHolder) throws Exception {
// 需要判断当前连接是否参与事务，若存在事务则不进行关闭操作
if (Transactions.get() == null) {
if (connectionHolder != null) {
connectionHolder.release();
}
}
}
@Override
public T openSession(ISessionExecutor executor) throws Exception {
return openSession(getDefaultConnectionHolder(), executor);
}
@Override
public T openSession(String dsName, ISessionExecutor executor) throws Exception {
return openSession(getConnectionHolder(dsName), executor);
}
@Override
public T openSession(IConnectionHolder connectionHolder, ISessionExecutor executor) throws Exception {
ISession _session = new DefaultSession(this, connectionHolder);
try {
return executor.execute(_session);
} finally {
_session.close();
}
}
@Override
public T openSession(IDataSourceRouter dataSourceRouter, ISessionExecutor executor) throws Exception {
return openSession(getConnectionHolder(dataSourceRouter.getDataSourceName()), executor);
}
@Override
public ISession openSession() throws Exception {
return new DefaultSession(this, getDefaultConnectionHolder());
}
@Override
public ISession openSession(String dsName) throws Exception {
return new DefaultSession(this, getConnectionHolder(dsName));
}
@Override
public ISession openSession(IConnectionHolder connectionHolder) throws Exception {
return new DefaultSession(this, connectionHolder);
}
@Override
public ISession openSession(IDataSourceRouter dataSourceRouter) throws Exception {
return new DefaultSession(this, getConnectionHolder(dataSourceRouter.getDataSourceName()));
}
/////
/**
* 数据库类型
*/
public enum DATABASE {
MYSQL, ORACLE, SQLSERVER, DB2, SQLITE, POSTGRESQL, HSQLDB, H2, UNKNOWN
}
/**
* 数据库事务类型
*/
public enum TRANSACTION {
/**
* 不（使用）支持事务
*/
NONE(Connection.TRANSACTION_NONE),
/**
* 在一个事务中进行查询时，允许读取提交前的数据，数据提交后，当前查询就可以读取到数据，update数据时候并不锁住表
*/
READ_COMMITTED(Connection.TRANSACTION_READ_COMMITTED),
/**
* 俗称“脏读”（dirty read），在没有提交数据时能够读到已经更新的数据
*/
READ_UNCOMMITTED(Connection.TRANSACTION_READ_UNCOMMITTED),
/**
* 在一个事务中进行查询时，不允许读取其他事务update的数据，允许读取到其他事务提交的新增数据
*/
REPEATABLE_READ(Connection.TRANSACTION_REPEATABLE_READ),
/**
* 在一个事务中进行查询时，不允许任何对这个查询表的数据修改
*/
SERIALIZABLE(Connection.TRANSACTION_SERIALIZABLE);
private int _level;
/**
* 构造器
*
* @param level 事务级别
*/
TRANSACTION(int level) {
this._level = level;
}
/**
* @return the level
*/
public int getLevel() {
return _level;
}
/**
* @param level the level to set
*/
public void setLevel(int level) {
this._level = level;
}
}
/**
* 框架提供的已知数据源适配器名称映射
*/
public static Map DS_ADAPTERS;
/**
* 框架提供的已知数据库连接驱动
*/
public static Map DB_DRIVERS;
/**
* 框架提供的已知数据库方言
*/
public static Map> DB_DIALECTS;
static {
//
DS_ADAPTERS = new HashMap();
DS_ADAPTERS.put("default", DefaultDataSourceAdapter.class.getName());
DS_ADAPTERS.put("jndi", JNDIDataSourceAdapter.class.getName());
DS_ADAPTERS.put("c3p0", C3P0DataSourceAdapter.class.getName());
DS_ADAPTERS.put("dbcp", DBCPDataSourceAdapter.class.getName());
//
DB_DRIVERS = new HashMap();
DB_DRIVERS.put(DATABASE.MYSQL, "com.mysql.jdbc.Driver");
DB_DRIVERS.put(DATABASE.ORACLE, "oracle.jdbc.OracleDriver");
DB_DRIVERS.put(DATABASE.SQLSERVER, "com.microsoft.sqlserver.jdbc.SQLServerDriver");
DB_DRIVERS.put(DATABASE.DB2, "com.ibm.db2.jcc.DB2Driver");
DB_DRIVERS.put(DATABASE.SQLITE, "org.sqlite.JDBC");
DB_DRIVERS.put(DATABASE.POSTGRESQL, "org.postgresql.Driver");
DB_DRIVERS.put(DATABASE.HSQLDB, "org.hsqldb.jdbcDriver");
DB_DRIVERS.put(DATABASE.H2, "org.h2.Driver");
//
DB_DIALECTS = new HashMap>();
DB_DIALECTS.put(DATABASE.MYSQL, MySQLDialect.class);
DB_DIALECTS.put(DATABASE.ORACLE, OracleDialect.class);
DB_DIALECTS.put(DATABASE.SQLSERVER, SQLServerDialect.class);
DB_DIALECTS.put(DATABASE.DB2, DB2Dialect.class);
DB_DIALECTS.put(DATABASE.SQLITE, SQLiteDialect.class);
DB_DIALECTS.put(DATABASE.POSTGRESQL, PostgreSQLDialect.class);
DB_DIALECTS.put(DATABASE.HSQLDB, HSQLDBDialect.class);
DB_DIALECTS.put(DATABASE.H2, H2Dialect.class);
}
}
