SpringBoot整合Sharding-JDBC，实现从数据库读取sharding-jdbc数据源，实现多种数据库数据源切换，数据库方言动态切换
SpringBoot整合Sharding-JDBC，实现从数据库读取sharding-jdbc数据源，实现多种数据库数据源切换，数据库方言动态切换
Hello，隔壁老王时隔很久很久又来了，今天给大家介绍的是一个分库分表的框架—sharding-jdbc。这个框架在我公司用到了，使用的还算比较复杂。这个项目有两种数据库，Mysql和SQLServer。因此需要动态的切换数据源，并且数据库方言也需要根据数据库类别进行切换，要不然就需要建两个一模一样的*Mapper.xml文件了。
在网上找了很久，很多的博客介绍的都是一种数据库类别。这也就导致了，找不到Spring的动态数据源与sharding-jdbc的整合。更别说数据库方言的切换了。
我一般不介绍概念之类的，需要看概念的，可以看这里。讲的比较深入。废话不多说了，开整吧！
1、数据库中配置的sharing-jdbc的表结构
CREATE TABLE `sharding_data_source` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增主键',
`rule_name` varchar(255) DEFAULT NULL COMMENT '环境前缀',
`database_type` varchar(255) DEFAULT NULL COMMENT '0：Mysql 1：SQLServer',
`url` varchar(255) DEFAULT NULL COMMENT '连接地址',
`user_name` varchar(255) DEFAULT NULL COMMENT '数据源 用户名',
`password` varchar(255) DEFAULT NULL COMMENT '数据源密码',
`driver_class` varchar(255) DEFAULT NULL COMMENT '驱动全类名',
`master_slave_type` varchar(255) DEFAULT NULL COMMENT '主(master) 从(slave)',
`sharding_column` varchar(255) DEFAULT NULL COMMENT '分库的列',
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC;CREATE TABLE `sharding_data_source_detail` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '自增id',
`data_source_id` int(11) DEFAULT NULL COMMENT '数据源id',
`logical_table` varchar(255) DEFAULT NULL COMMENT '逻辑表名',
`sharding_column` varchar(255) DEFAULT NULL COMMENT '分表列',
`actual_table` varchar(255) DEFAULT NULL COMMENT '物理表名',
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC;其中sharding_data_source表用于存储数据库的相关信息，数据库地址、用户名、密码、数据库分片键之类的数据；sharding_data_source_detail则用于存储分表相关信息，逻辑表名、物理表名、表分片键。
2、程序启动时从数据库中获取数据源信息并创建sharding-jdbc数据源
先看一下sharding-jdbc与Spring动态数据源的整合
@Configuration
public class DynamicDataSourceConfig {
/**
* 将动态数据源设置为主
*
* @param mysqlShardingDataSource
* @param sqlServerShardingDataSource
* @return
*/
@Bean
@Primary
@DependsOn({"mysqlShardingDataSource", "sqlServerShardingDataSource"})
public DynamicDataSource dataSource(@Qualifier("mysqlShardingDataSource") DataSource mysqlShardingDataSource,
@Qualifier("sqlServerShardingDataSource") DataSource sqlServerShardingDataSource) {
DynamicDataSource dynamicDataSource = new DynamicDataSource();
Map targetDataSources = new HashMap<>(2);
targetDataSources.put(DatabaseType.MYSQL_LOWER_CASE, mysqlShardingDataSource);
targetDataSources.put(DatabaseType.SQL_SERVER_LOWER_CASE, sqlServerShardingDataSource);
dynamicDataSource.setTargetDataSources(targetDataSources);
dynamicDataSource.setDefaultTargetDataSource(mysqlShardingDataSource);
return dynamicDataSource;
}
/**
* SQLServer数据源
*
* @param dataSourceTemplate
* @param restTemplate
* @return
* @throws SQLException
*/
@Bean("sqlServerShardingDataSource")
public DataSource sqlServerDataSource(DataSourceTemplate dataSourceTemplate, RestTemplate restTemplate) throws SQLException {
return dataSourceTemplate.getDataSource(DatabaseType.SQL_SERVER, restTemplate);
}
/**
* Mysql数据源
*
* @param dataSourceTemplate
* @param restTemplate
* @return
* @throws SQLException
*/
@Bean("mysqlShardingDataSource")
public DataSource mySqlDataSource(DataSourceTemplate dataSourceTemplate, RestTemplate restTemplate) throws SQLException {
return dataSourceTemplate.getDataSource(DatabaseType.MYSQL, restTemplate);
}
/**
* 配置数据库方言
*
* @return
*/
@Bean
public VendorDatabaseIdProvider databaseIdProvider() {
VendorDatabaseIdProvider provider = new VendorDatabaseIdProvider();
Properties properties = new Properties();
properties.setProperty(DatabaseType.MYSQL_CAPITAL, DatabaseType.MYSQL_LOWER_CASE);
properties.setProperty(DatabaseType.SQL_SERVER_CAPITAL, DatabaseType.SQL_SERVER_LOWER_CASE);
provider.setProperties(properties);
return provider;
}
/**
* 配置Mysql的SqlSessionFactory
*
* @param dataSource
* @param provider
* @return
* @throws Exception
*/
@Bean("mySqlSessionFactory")
@Primary
@ConditionalOnBean(DynamicDataSource.class)
public SqlSessionFactory mySqlSessionFactory(@Qualifier("mysqlShardingDataSource") DataSource dataSource, DatabaseIdProvider provider) throws Exception {
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory(dataSource, provider);
sqlSessionFactory.getConfiguration().setDatabaseId(DatabaseType.MYSQL_LOWER_CASE);
return sqlSessionFactory;
}
/**
* 配置SQLServer的SqlSessionFactory
*
* @param dataSource
* @param provider
* @return
* @throws Exception
*/
@Bean("sqlServerSessionFactory")
@ConditionalOnBean(DynamicDataSource.class)
public SqlSessionFactory sqlServerSessionFactory(@Qualifier("sqlServerShardingDataSource") DataSource dataSource, DatabaseIdProvider provider) throws Exception {
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory(dataSource, provider);
sqlSessionFactory.getConfiguration().setDatabaseId(DatabaseType.SQL_SERVER_LOWER_CASE);
return sqlSessionFactory;
}
/**
* 配置SqlSessionTemplate为自定义的SqlSessionTemplate
*
* @param mySqlSessionFactory
* @param sqlServerSessionFactory
* @return
*/
@Bean
@ConditionalOnBean(DynamicDataSource.class)
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("mySqlSessionFactory") SqlSessionFactory mySqlSessionFactory,
@Qualifier("sqlServerSessionFactory") SqlSessionFactory sqlServerSessionFactory) {
Map map = new HashMap<>(3);
map.put(DatabaseType.MYSQL_LOWER_CASE, mySqlSessionFactory);
map.put(DatabaseType.SQL_SERVER_LOWER_CASE, sqlServerSessionFactory);
CustomSqlSessionTemplate sqlSessionTemplate = new CustomSqlSessionTemplate(mySqlSessionFactory);
sqlSessionTemplate.setTargetSqlSessionFactorys(map);
return sqlSessionTemplate;
}
private SqlSessionFactory getSqlSessionFactory(DataSource dataSource, DatabaseIdProvider provider) throws Exception {
SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
sessionFactoryBean.setDataSource(dataSource);
sessionFactoryBean.setDatabaseIdProvider(provider);
sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/hyy/sharding/jdbc/mapper/*.xml"));
return sessionFactoryBean.getObject();
}
} @Component
public class DataSourceTemplate {
/**
* 获取指定数据库类型的数据库信息列表
*
* @param databaseType
* @param restTemplate
* @return
* @throws SQLException
*/
public DataSource getDataSource(String databaseType, RestTemplate restTemplate) throws SQLException {
DataSourceHandler.setDataSourceType(DatabaseType.BASE);
ResponseEntity responseEntity = restTemplate.getForEntity("http://base-datasource-service/base/datasource/" + databaseType + "/getDataSources", List.class);
List dataSources = JSON.parseArray(JSON.toJSONString(responseEntity.getBody()), DataSourceEntity.class);
Map> masterSlaveDataSource = new HashMap<>();
Map map = getLogicalDataSourceDetailMap(dataSources, masterSlaveDataSource);
Map dataSourceMap = new HashMap<>();
ShardingRuleConfiguration shardingRuleConfig = getShardingRuleConfiguration(map, masterSlaveDataSource, dataSourceMap);
Properties shardingProperties = getProperties();
return ShardingDataSourceFactory.createDataSource(dataSourceMap, shardingRuleConfig, new HashMap<>(), shardingProperties);
}
/**
* 获取属性配置
*
* @return
*/
private Properties getProperties() {
Properties shardingProperties = new Properties();
shardingProperties.put("sql.show", true);
return shardingProperties;
}
/**
* 获取组装好的ShardingRuleConfiguration
*
* @param detailMap
* @return
*/
private ShardingRuleConfiguration getShardingRuleConfiguration(Map detailMap, Map> masterSlaveDataSource, Map dataSourceMap) {
// 分片规则配置文件类
ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration();
for (String logicTable : detailMap.keySet()) {
DataSourceDetailEntity dataSourceDetail = detailMap.get(logicTable);
// 表分片规则配置类
TableRuleConfiguration ruleConfig = new TableRuleConfiguration();
// 分表策略
ComplexShardingStrategyConfiguration databaseShardingStrategyConfig = new ComplexShardingStrategyConfiguration(dataSourceDetail.getDatabaseShardingColumn(),
ModuloDatabaseShardingAlgorithm.class.getName());
// 设置分库策略，缺省表示使用默认分库策略，即ShardingRuleConfiguration中配置的分库策略
ruleConfig.setDatabaseShardingStrategyConfig(databaseShardingStrategyConfig);
// 分表规则
ruleConfig.setTableShardingStrategyConfig(new ComplexShardingStrategyConfiguration(dataSourceDetail.getShardingColumn(),
ModuloTableShardingAlgorithm.class.getName()));
// 真实的数据节点
String actualDataNodes = dataSourceDetail.getActualDataNodes();
/*
1) 由数据源名 + 表名组成 以小数点分割，多个表以逗号隔开，支持inline表达式
2) 缺省时，以已知 数据源名称和逻辑表名称生成数据节点
3) 用于广播表 --即每个库中都需要一个同样的表进行关联查询，多为字典表
4) 只分库不分表且所有库的表结构完全一致的情况
*/
ruleConfig.setActualDataNodes(actualDataNodes);
// 逻辑表名称
ruleConfig.setLogicTable(logicTable);
shardingRuleConfig.getTableRuleConfigs().add(ruleConfig);
}
for (String key : masterSlaveDataSource.keySet()) {
Map temDatasourceMap = masterSlaveDataSource.get(key);
MasterSlaveRuleConfiguration masterSlaveRuleConfiguration = new MasterSlaveRuleConfiguration();
masterSlaveRuleConfiguration.setName(key);
for (String tKey : temDatasourceMap.keySet()) {
if (tKey.contains("master")) {
masterSlaveRuleConfiguration.setMasterDataSourceName(tKey);
} else if (tKey.contains("slave")) {
masterSlaveRuleConfiguration.getSlaveDataSourceNames().add(tKey);
}
dataSourceMap.put(tKey, temDatasourceMap.get(tKey));
}
shardingRuleConfig.getMasterSlaveRuleConfigs().add(masterSlaveRuleConfiguration);
}
return shardingRuleConfig;
}
/**
* Map 逻辑表名, 详细信息
*
* @param dataSources
* @param masterSlaveDataSource
* @return
*/
private Map getLogicalDataSourceDetailMap(List dataSources, Map> masterSlaveDataSource) {
Map logicalMap = new HashMap<>();
for (int i = 0; i < dataSources.size(); i++) {
DataSourceEntity dataSource = dataSources.get(i);
String dataSourceName = dataSource.getRuleName();
//添加所有数据源
if (masterSlaveDataSource.containsKey(dataSourceName)) {
masterSlaveDataSource.get(dataSourceName).put(dataSource.getMasterSlaveType() + i, buildDataSource(dataSource));
} else {
Map stringDataSourceMap = new HashMap<>();
masterSlaveDataSource.put(dataSourceName, stringDataSourceMap);
stringDataSourceMap.put(dataSource.getMasterSlaveType() + i, buildDataSource(dataSource));
}
StringBuilder stringBuffer = new StringBuilder();
for (DataSourceDetailEntity dataSourceDetail : dataSource.getDataSourceDetails()) {
String logicalTable = dataSourceDetail.getLogicalTable().toLowerCase();
String actualTable = dataSourceDetail.getActualTable().toLowerCase();
if (!logicalMap.containsKey(logicalTable)) {
stringBuffer.append(dataSourceName).append(".").append(actualTable);
dataSourceDetail.setActualDataNodes(stringBuffer.toString());
dataSourceDetail.setDatabaseShardingColumn(dataSource.getShardingColumn());
logicalMap.put(logicalTable, dataSourceDetail);
} else {
String actualDataNodes = logicalMap.get(logicalTable).getActualDataNodes();
stringBuffer.append(actualDataNodes).append(",").append(dataSourceName).append(".").append(actualTable);
logicalMap.get(logicalTable).setActualDataNodes(stringBuffer.toString());
}
stringBuffer.setLength(0);
}
}
return logicalMap;
}
/**
* 创建数据源
*
* @param dataSourceEntity
* @return
*/
private javax.sql.DataSource buildDataSource(DataSourceEntity dataSourceEntity) {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(dataSourceEntity.getDriverClass());
dataSource.setUrl(dataSourceEntity.getUrl());
dataSource.setUsername(dataSourceEntity.getUserName());
dataSource.setPassword(dataSourceEntity.getPassword());
dataSource.setMaxActive(100);
dataSource.setInitialSize(10);
dataSource.setTestWhileIdle(true);
dataSource.setTestOnBorrow(false);
dataSource.setTestOnReturn(false);
dataSource.setMaxWait(10000);
dataSource.setValidationQuery("select 'x'");
dataSource.setTimeBetweenEvictionRunsMillis(60000);
dataSource.setMinEvictableIdleTimeMillis(300000);
dataSource.setRemoveAbandoned(true);
dataSource.setRemoveAbandonedTimeout(80);
return dataSource;
}
}
因为需要在程序启动时就去查询数据库，但是这个时候，Spring的ApplicationContext还没有初始化，因为，没法通过注入的方式获取到*Mapper，也就没法直接通过*Mapper查询数据库了。
在这里，给大家提供以下两种解决方案：
（1）如果你的项目使用了Spring Cloud，那么可以通过上面的代码，调用其他服务来获取数据源信息。这种方式，就无法通过在RestTemplate上增加@LoadBalance来实现调用微服务了。因此在配置RsetTemplate时，可以使用如下方式：
@Bean
public RestTemplate restTemplate(final List customizers) {
RestTemplate restTemplate = new RestTemplate();
for (RestTemplateCustomizer customizer : customizers) {
customizer.customize(restTemplate);
}
return restTemplate;
} （2）如果你的项目没有使用到Spring Cloud，那么就只能通过硬编码的方式来获取数据源信息了。具体配置方式如下：
@Component
public class DataSourceTemplate {
public static ConcurrentHashMap> concurrentHashMap = new ConcurrentHashMap<>();
public DataSourceTemplate() {
Connection connection = null;
try {
String driverClassName = "com.mysql.jdbc.Driver";
String url = "xxxx";
String username = "xxxx";
String password = "xxxx";
Class.forName(driverClassName);
connection = DriverManager.getConnection(url, username, password);
PreparedStatement preparedStatement = connection.prepareStatement("select * from sharding_data_source");
ResultSet resultSet = preparedStatement.executeQuery();
DataSourceEntity dataSource;
List dataSourceDetails;
DataSourceDetailEntity dataSourceDetail;
while (resultSet.next()) {
dataSource = new DataSourceEntity();
dataSource.setId(resultSet.getLong("id"));
dataSource.setRuleName(resultSet.getString("rule_name"));
dataSource.setDatabaseType(resultSet.getString("database_type"));
dataSource.setUrl(resultSet.getString("url"));
dataSource.setUserName(resultSet.getString("user_name"));
dataSource.setPassword(resultSet.getString("password"));
dataSource.setDriverClass(resultSet.getString("driver_class"));
dataSource.setMasterSlaveType(resultSet.getString("master_slave_type"));
dataSource.setShardingColumn(resultSet.getString("sharding_column"));
preparedStatement = connection.prepareStatement("select * from sharding_data_source_detail where data_source_id = " + dataSource.getId());
ResultSet resultSet1 = preparedStatement.executeQuery();
dataSourceDetails = new ArrayList<>();
while (resultSet1.next()) {
dataSourceDetail = new DataSourceDetail();
dataSourceDetail.setLogicalTable(resultSet1.getString("logical_table"));
dataSourceDetail.setShardingColumn(resultSet1.getString("sharding_column"));
dataSourceDetail.setActualTable(resultSet1.getString("actual_table"));
dataSourceDetails.add(dataSourceDetail);
}
dataSource.setDataSourceDetails(dataSourceDetails);
concurrentHashMap.computeIfAbsent(dataSource.getDatabaseType(), k -> new ArrayList<>());
concurrentHashMap.get(dataSource.getDatabaseType()).add(dataSource);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
public DataSource getDataSource(String databaseType) throws SQLException {
DataSourceHandler.setDataSourceType(DatabaseType.BASE);
List dataSources = concurrentHashMap.get(databaseType);
Map> masterSlaveDataSource = new HashMap<>();
Map map = getLogicalDataSourceDetailMap(dataSources, masterSlaveDataSource);
Map dataSourceMap = new HashMap<>();
ShardingRuleConfiguration shardingRuleConfig = getShardingRuleConfiguration(map, masterSlaveDataSource, dataSourceMap);
Properties shardingProperties = getProperties();
return ShardingDataSourceFactory.createDataSource(dataSourceMap, shardingRuleConfig, new HashMap<>(), shardingProperties);
}
} 其余代码与上面的一样，只是在实例化DataSourceTemplate类时，以硬编码的方式查询数据库，并将数据库信息放到ConcurrentHashMap中。后续需要某类型的数据库信息时，直接从ConcurrentHashMap中取就可以了。
到了这里，基本上可以实现数据源动态切换了。注意，只是可以切换数据源了。统统的Mapper文件，你还得写多份，以区分不同的数据库。如果在网上搜，你会发现让你配置VendorDatabaseIdProvider。在上面的配置，你会发现我们已经配置了，但是还是不起作用。那是因为网上的教程都是基于java.sql.DataSource的，因此只配置VendorDatabaseIdProvider是可以做到数据库方言根据数据源类型切换。但是，我们现在用的是Sharding-Jdbc的数据源，所以哪怕配置了VendorDatabaseIdProvider，也没法做到数据库方言的自动切换。我们还需要实现SqlSessionTemplate接口，重写getSqlSessionFactory方法。主要是为了根据线程中设置的数据类型返回对应的SqlSessionFactory。
public class CustomSqlSessionTemplate extends SqlSessionTemplate {
private final SqlSessionFactory sqlSessionFactory;
private final ExecutorType executorType;
private final SqlSession sqlSessionProxy;
private final PersistenceExceptionTranslator exceptionTranslator;
private Map targetSqlSessionFactorys;
private SqlSessionFactory defaultTargetSqlSessionFactory;
public void setTargetSqlSessionFactorys(Map targetSqlSessionFactorys) {
this.targetSqlSessionFactorys = targetSqlSessionFactorys;
}
public void setDefaultTargetSqlSessionFactory(SqlSessionFactory defaultTargetSqlSessionFactory) {
this.defaultTargetSqlSessionFactory = defaultTargetSqlSessionFactory;
}
public CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
this(sqlSessionFactory, sqlSessionFactory.getConfiguration().getDefaultExecutorType());
}
private CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType) {
this(sqlSessionFactory, executorType, new MyBatisExceptionTranslator(sqlSessionFactory.getConfiguration()
.getEnvironment().getDataSource(), true));
}
private CustomSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType,
PersistenceExceptionTranslator exceptionTranslator) {
super(sqlSessionFactory, executorType, exceptionTranslator);
this.sqlSessionFactory = sqlSessionFactory;
this.executorType = executorType;
this.exceptionTranslator = exceptionTranslator;
this.sqlSessionProxy = (SqlSession) newProxyInstance(
SqlSessionFactory.class.getClassLoader(),
new Class[] { SqlSession.class },
new SqlSessionInterceptor());
this.defaultTargetSqlSessionFactory = sqlSessionFactory;
}
@Override
public SqlSessionFactory getSqlSessionFactory() {
SqlSessionFactory targetSqlSessionFactory = targetSqlSessionFactorys.get(DataSourceHandler.getDataSourceType());
if (targetSqlSessionFactory != null) {
return targetSqlSessionFactory;
} else if (defaultTargetSqlSessionFactory != null) {
return defaultTargetSqlSessionFactory;
} else {
Assert.notNull(targetSqlSessionFactorys, "Property 'targetSqlSessionFactorys' or 'defaultTargetSqlSessionFactory' are required");
Assert.notNull(defaultTargetSqlSessionFactory, "Property 'defaultTargetSqlSessionFactory' or 'targetSqlSessionFactorys' are required");
}
return this.sqlSessionFactory;
}
@Override
public Configuration getConfiguration() {
return this.getSqlSessionFactory().getConfiguration();
}
@Override
public ExecutorType getExecutorType() {
return this.executorType;
}
@Override
public PersistenceExceptionTranslator getPersistenceExceptionTranslator() {
return this.exceptionTranslator;
}
/**
* {@inheritDoc}
*/
@Override
public T selectOne(String statement) {
return this.sqlSessionProxy. selectOne(statement);
}
/**
* {@inheritDoc}
*/
@Override
public T selectOne(String statement, Object parameter) {
return this.sqlSessionProxy. selectOne(statement, parameter);
}
/**
* {@inheritDoc}
*/
@Override
public Map selectMap(String statement, String mapKey) {
return this.sqlSessionProxy. selectMap(statement, mapKey);
}
/**
* {@inheritDoc}
*/
@Override
public Map selectMap(String statement, Object parameter, String mapKey) {
return this.sqlSessionProxy. selectMap(statement, parameter, mapKey);
}
/**
* {@inheritDoc}
*/
@Override
public Map selectMap(String statement, Object parameter, String mapKey, RowBounds rowBounds) {
return this.sqlSessionProxy. selectMap(statement, parameter, mapKey, rowBounds);
}
/**
* {@inheritDoc}
*/
@Override
public List selectList(String statement) {
return this.sqlSessionProxy. selectList(statement);
}
/**
* {@inheritDoc}
*/
@Override
public List selectList(String statement, Object parameter) {
return this.sqlSessionProxy. selectList(statement, parameter);
}
/**
* {@inheritDoc}
*/
@Override
public List selectList(String statement, Object parameter, RowBounds rowBounds) {
return this.sqlSessionProxy. selectList(statement, parameter, rowBounds);
}
/**
* {@inheritDoc}
*/
@Override
public void select(String statement, ResultHandler handler) {
this.sqlSessionProxy.select(statement, handler);
}
/**
* {@inheritDoc}
*/
@Override
public void select(String statement, Object parameter, ResultHandler handler) {
this.sqlSessionProxy.select(statement, parameter, handler);
}
/**
* {@inheritDoc}
*/
@Override
public void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler) {
this.sqlSessionProxy.select(statement, parameter, rowBounds, handler);
}
/**
* {@inheritDoc}
*/
@Override
public int insert(String statement) {
return this.sqlSessionProxy.insert(statement);
}
/**
* {@inheritDoc}
*/
@Override
public int insert(String statement, Object parameter) {
return this.sqlSessionProxy.insert(statement, parameter);
}
/**
* {@inheritDoc}
*/
@Override
public int update(String statement) {
return this.sqlSessionProxy.update(statement);
}
/**
* {@inheritDoc}
*/
@Override
public int update(String statement, Object parameter) {
return this.sqlSessionProxy.update(statement, parameter);
}
/**
* {@inheritDoc}
*/
@Override
public int delete(String statement) {
return this.sqlSessionProxy.delete(statement);
}
/**
* {@inheritDoc}
*/
@Override
public int delete(String statement, Object parameter) {
return this.sqlSessionProxy.delete(statement, parameter);
}
/**
* {@inheritDoc}
*/
@Override
public T getMapper(Class type) {
return getConfiguration().getMapper(type, this);
}
/**
* {@inheritDoc}
*/
@Override
public void commit() {
throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
}
/**
* {@inheritDoc}
*/
@Override
public void commit(boolean force) {
throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
}
/**
* {@inheritDoc}
*/
@Override
public void rollback() {
throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
}
/**
* {@inheritDoc}
*/
@Override
public void rollback(boolean force) {
throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
}
/**
* {@inheritDoc}
*/
@Override
public void close() {
throw new UnsupportedOperationException("Manual close is not allowed over a Spring managed SqlSession");
}
/**
* {@inheritDoc}
*/
@Override
public void clearCache() {
this.sqlSessionProxy.clearCache();
}
/**
* {@inheritDoc}
*/
@Override
public Connection getConnection() {
return this.sqlSessionProxy.getConnection();
}
/**
* {@inheritDoc}
* @since 1.0.2
*/
@Override
public List flushStatements() {
return this.sqlSessionProxy.flushStatements();
}
/**
* Proxy needed to route MyBatis method calls to the proper SqlSession got from Spring's Transaction Manager It also
* unwraps exceptions thrown by {@code Method#invoke(Object, Object...)} to pass a {@code PersistenceException} to
* the {@code PersistenceExceptionTranslator}.
*/
private class SqlSessionInterceptor implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
final SqlSession sqlSession = getSqlSession(
CustomSqlSessionTemplate.this.getSqlSessionFactory(),
CustomSqlSessionTemplate.this.executorType,
CustomSqlSessionTemplate.this.exceptionTranslator);
try {
Object result = method.invoke(sqlSession, args);
if (!isSqlSessionTransactional(sqlSession, CustomSqlSessionTemplate.this.getSqlSessionFactory())) {
// force commit even on non-dirty sessions because some databases require
// a commit/rollback before calling close()
sqlSession.commit(true);
}
return result;
} catch (Throwable t) {
Throwable unwrapped = unwrapThrowable(t);
if (CustomSqlSessionTemplate.this.exceptionTranslator != null && unwrapped instanceof PersistenceException) {
Throwable translated = CustomSqlSessionTemplate.this.exceptionTranslator
.translateExceptionIfPossible((PersistenceException) unwrapped);
if (translated != null) {
unwrapped = translated;
}
}
throw unwrapped;
} finally {
closeSqlSession(sqlSession, CustomSqlSessionTemplate.this.getSqlSessionFactory());
}
}
}
} 配置好后，我们的*Mapper.xml就只需要一份，相同的业务功能，指定对应的databaseId即可。
项目启动后，调用分别调用http://localhost:8082/code/mysql/getCodes和http://localhost:8082/code/sqlServer/getCodes，查看控制台输出：
demo看这里