com.avaje.ebean.Ebean Maven / Gradle / Ivy
package com.avaje.ebean;
import com.avaje.ebean.cache.ServerCacheManager;
import com.avaje.ebean.config.ServerConfig;
import com.avaje.ebean.text.csv.CsvReader;
import com.avaje.ebean.text.json.JsonContext;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.persistence.OptimisticLockException;
import javax.persistence.PersistenceException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* This Ebean object is effectively a singleton that holds a map of registered
* {@link EbeanServer}s. It additionally provides a convenient way to use the
* 'default' EbeanServer.
*
* If you are using a Dependency Injection framework such as
* Spring or Guice you will probably
* NOT use this Ebean singleton object. Instead you will
* configure and construct EbeanServer instances using {@link ServerConfig} and
* {@link EbeanServerFactory} and inject those EbeanServer instances into your
* data access objects.
*
*
* In documentation "Ebean singleton" refers to this object.
*
*
* - There is one EbeanServer per Database (javax.sql.DataSource).
* - EbeanServers can be 'registered' with the Ebean singleton (put into its
* map). Registered EbeanServer's can later be retrieved via
* {@link #getServer(String)}.
* - One EbeanServer can be referred to as the 'default' EbeanServer. For
* convenience, the Ebean singleton (this object) provides methods such as
* {@link #find(Class)} that proxy through to the 'default' EbeanServer. This
* can be useful for applications that use a single database.
*
*
*
* For developer convenience Ebean has static methods that proxy through to the
* methods on the 'default' EbeanServer. These methods are provided for
* developers who are mostly using a single database. Many developers will be
* able to use the methods on Ebean rather than get a EbeanServer.
*
*
* EbeanServers can be created and used without ever needing or using the Ebean
* singleton. Refer to {@link ServerConfig#setRegister(boolean)}.
*
*
* You can either programmatically create/register EbeanServers via
* {@link EbeanServerFactory} or they can automatically be created and
* registered when you first use the Ebean singleton. When EbeanServers are
* created automatically they are configured using information in the
* ebean.properties file.
*
*
* {@code
*
* // fetch shipped orders (and also their customer)
* List list = Ebean.find(Order.class)
* .fetch("customer")
* .where()
* .eq("status.code", Order.Status.SHIPPED)
* .findList();
*
* // read/use the order list ...
* for (Order order : list) {
* Customer customer = order.getCustomer();
* ...
* }
*
* }
*
* {@code
*
* // fetch order 10, modify and save
* Order order = Ebean.find(Order.class, 10);
*
* OrderStatus shipped = Ebean.getReference(OrderStatus.class,"SHIPPED");
* order.setStatus(shipped);
* order.setShippedDate(shippedDate);
* ...
*
* // implicitly creates a transaction and commits
* Ebean.save(order);
*
* }
*
*
* When you have multiple databases and need access to a specific one the
* {@link #getServer(String)} method provides access to the EbeanServer for that
* specific database.
*
*
* {@code
*
* // Get access to the Human Resources EbeanServer/Database
* EbeanServer hrDb = Ebean.getServer("hr");
*
*
* // fetch contact 3 from the HR database
* Contact contact = hrDb.find(Contact.class, 3);
*
* contact.setName("I'm going to change");
* ...
*
* // save the contact back to the HR database
* hrDb.save(contact);
*
* }
*/
public final class Ebean {
private static final Logger logger = LoggerFactory.getLogger(Ebean.class);
/**
* Manages creation and cache of EbeanServers.
*/
private static final Ebean.ServerManager serverMgr = new Ebean.ServerManager();
/**
* Helper class for managing fast and safe access and creation of
* EbeanServers.
*/
private static final class ServerManager {
/**
* Cache for fast concurrent read access.
*/
private final ConcurrentHashMap concMap = new ConcurrentHashMap();
/**
* Cache for synchronized read, creation and put. Protected by the monitor
* object.
*/
private final HashMap syncMap = new HashMap();
private final Object monitor = new Object();
/**
* The 'default' EbeanServer.
*/
private EbeanServer defaultServer;
private ServerManager() {
try {
// skipDefaultServer is set by EbeanServerFactory
// ... when it is creating the primaryServer
if (PrimaryServer.isSkip()) {
// primary server being created by EbeanServerFactory
// ... so we should not try and create it here
logger.debug("PrimaryServer.isSkip()");
} else {
// look to see if there is a default server defined
String defaultName = PrimaryServer.getDefaultServerName();
logger.debug("defaultName:" + defaultName);
if (defaultName != null && !defaultName.trim().isEmpty()) {
defaultServer = getWithCreate(defaultName.trim());
}
}
} catch (Throwable e) {
logger.error("Error trying to create the default EbeanServer", e);
throw new RuntimeException(e);
}
}
private EbeanServer getDefaultServer() {
if (defaultServer == null) {
String msg = "The default EbeanServer has not been defined?";
msg += " This is normally set via the ebean.datasource.default property.";
msg += " Otherwise it should be registered programmatically via registerServer()";
throw new PersistenceException(msg);
}
return defaultServer;
}
private EbeanServer get(String name) {
if (name == null || name.isEmpty()) {
return defaultServer;
}
// non-synchronized read
EbeanServer server = concMap.get(name);
if (server != null) {
return server;
}
// synchronized read, create and put
return getWithCreate(name);
}
/**
* Synchronized read, create and put of EbeanServers.
*/
private EbeanServer getWithCreate(String name) {
synchronized (monitor) {
EbeanServer server = syncMap.get(name);
if (server == null) {
// register when creating server this way
server = EbeanServerFactory.create(name);
register(server, false);
}
return server;
}
}
/**
* Register a server so we can get it by its name.
*/
private void register(EbeanServer server, boolean isDefaultServer) {
registerWithName(server.getName(), server, isDefaultServer);
}
private void registerWithName(String name, EbeanServer server, boolean isDefaultServer) {
synchronized (monitor) {
concMap.put(name, server);
syncMap.put(name, server);
if (isDefaultServer) {
defaultServer = server;
}
}
}
}
private Ebean() {
}
/**
* Get the EbeanServer for a given DataSource. If name is null this will
* return the 'default' EbeanServer.
*
* This is provided to access EbeanServer for databases other than the
* 'default' database. EbeanServer also provides more control over
* transactions and the ability to use transactions created externally to
* Ebean.
*
*
* {@code
* // use the "hr" database
* EbeanServer hrDatabase = Ebean.getServer("hr");
*
* Person person = hrDatabase.find(Person.class, 10);
* }
*
* @param name
* the name of the server, can use null for the 'default server'
*/
public static EbeanServer getServer(String name) {
return serverMgr.get(name);
}
/**
* Returns the default EbeanServer.
*
* This is equivalent to Ebean.getServer(null);
*
*/
public static EbeanServer getDefaultServer() {
return serverMgr.getDefaultServer();
}
/**
* Return the ExpressionFactory from the default server.
*
* The ExpressionFactory is used internally by the query and ExpressionList to
* build the WHERE and HAVING clauses. Alternatively you can use the
* ExpressionFactory directly to create expressions to add to the query where
* clause.
*
*
* Alternatively you can use the {@link Expr} as a shortcut to the
* ExpressionFactory of the 'Default' EbeanServer.
*
*
* You generally need to the an ExpressionFactory (or {@link Expr}) to build
* an expression that uses OR like Expression e = Expr.or(..., ...);
*
*/
public static ExpressionFactory getExpressionFactory() {
return serverMgr.getDefaultServer().getExpressionFactory();
}
/**
* Register the server with this Ebean singleton. Specify if the registered
* server is the primary/default server.
*/
public static void register(EbeanServer server, boolean defaultServer) {
serverMgr.register(server, defaultServer);
}
/**
* Backdoor for registering a mock implementation of EbeanServer as the default server.
*/
protected static EbeanServer mock(String name, EbeanServer server, boolean defaultServer) {
EbeanServer originalPrimaryServer = serverMgr.defaultServer;
serverMgr.registerWithName(name, server, defaultServer);
return originalPrimaryServer;
}
/**
* Return the next identity value for a given bean type.
*
* This will only work when a IdGenerator is on this bean type such as a DB
* sequence or UUID.
*
*
* For DB's supporting getGeneratedKeys and sequences such as Oracle10 you do
* not need to use this method generally. It is made available for more
* complex cases where it is useful to get an ID prior to some processing.
*
*/
public static Object nextId(Class beanType) {
return serverMgr.getDefaultServer().nextId(beanType);
}
/**
* Start a transaction with 'REQUIRED' semantics.
*
* With REQUIRED semantics if an active transaction already exists that transaction will be used.
*
*
* The transaction is stored in a ThreadLocal variable and typically you only
* need to use the returned Transaction IF you wish to do things like
* use batch mode, change the transaction isolation level, use savepoints or
* log comments to the transaction log.
*
*
* Example of using a transaction to span multiple calls to find(), save()
* etc.
*
*
* {@code
*
* // start a transaction (stored in a ThreadLocal)
* Ebean.beginTransaction();
* try {
* Order order = Ebean.find(Order.class,10); ...
*
* Ebean.save(order);
*
* Ebean.commitTransaction();
*
* } finally {
* // rollback if we didn't commit
* // i.e. an exception occurred before commitTransaction().
* Ebean.endTransaction();
* }
*
* }
*
*
* If you want to externalise the transaction management then you should be
* able to do this via EbeanServer. Specifically with EbeanServer you can pass
* the transaction to the various find() and save() execute() methods. This
* gives you the ability to create the transactions yourself externally from
* Ebean and pass those transactions through to the various methods available
* on EbeanServer.
*
*/
public static Transaction beginTransaction() {
return serverMgr.getDefaultServer().beginTransaction();
}
/**
* Start a transaction additionally specifying the isolation level.
*
* @param isolation
* the Transaction isolation level
*
*/
public static Transaction beginTransaction(TxIsolation isolation) {
return serverMgr.getDefaultServer().beginTransaction(isolation);
}
/**
* Start a transaction typically specifying REQUIRES_NEW or REQUIRED semantics.
*
*
* Note that this provides an try finally alternative to using {@link #execute(TxScope, TxCallable)} or
* {@link #execute(TxScope, TxRunnable)}.
*
*
* REQUIRES_NEW example:
* {@code
* // Start a new transaction. If there is a current transaction
* // suspend it until this transaction ends
* Transaction txn = Ebean.beginTransaction(TxScope.requiresNew());
* try {
*
* ...
*
* // commit the transaction
* txn.commit();
*
* } finally {
* // end this transaction which:
* // A) will rollback transaction if it has not been committed already
* // B) will restore a previously suspended transaction
* txn.end();
* }
*
* }
*
* REQUIRED example:
* {@code
*
* // start a new transaction if there is not a current transaction
* Transaction txn = Ebean.beginTransaction(TxScope.required());
* try {
*
* ...
*
* // commit the transaction if it was created or
* // do nothing if there was already a current transaction
* txn.commit();
*
* } finally {
* // end this transaction which will rollback the transaction
* // if it was created for this try finally scope and has not
* // already been committed
* txn.end();
* }
*
* }
*/
public static Transaction beginTransaction(TxScope scope){
return serverMgr.getDefaultServer().beginTransaction(scope);
}
/**
* Returns the current transaction or null if there is no current transaction
* in scope.
*/
public static Transaction currentTransaction() {
return serverMgr.getDefaultServer().currentTransaction();
}
/**
* Register a TransactionCallback on the currently active transaction.
*
* If there is no currently active transaction then a PersistenceException is thrown.
*
* @param transactionCallback the transaction callback to be registered with the current transaction
*
* @throws PersistenceException if there is no currently active transaction
*/
public static void register(TransactionCallback transactionCallback) throws PersistenceException {
serverMgr.getDefaultServer().register(transactionCallback);
}
/**
* Commit the current transaction.
*/
public static void commitTransaction() {
serverMgr.getDefaultServer().commitTransaction();
}
/**
* Rollback the current transaction.
*/
public static void rollbackTransaction() {
serverMgr.getDefaultServer().rollbackTransaction();
}
/**
* If the current transaction has already been committed do nothing otherwise
* rollback the transaction.
*
* Useful to put in a finally block to ensure the transaction is ended, rather
* than a rollbackTransaction() in each catch block.
*
*
* Code example:
*
*
* {@code
* Ebean.beginTransaction();
* try {
* // do some fetching and or persisting
*
* // commit at the end
* Ebean.commitTransaction();
*
* } finally {
* // if commit didn't occur then rollback the transaction
* Ebean.endTransaction();
* }
* }
*/
public static void endTransaction() {
serverMgr.getDefaultServer().endTransaction();
}
/**
* Mark the current transaction as rollback only.
*/
public static void setRollbackOnly() {
serverMgr.getDefaultServer().currentTransaction().setRollbackOnly();
}
/**
* Return a map of the differences between two objects of the same type.
*
* When null is passed in for b, then the 'OldValues' of a is used for the
* difference comparison.
*
*/
public static Map diff(Object a, Object b) {
return serverMgr.getDefaultServer().diff(a, b);
}
/**
* Either Insert or Update the bean depending on its state.
*
* If there is no current transaction one will be created and committed for
* you automatically.
*
*
* Save can cascade along relationships. For this to happen you need to
* specify a cascade of CascadeType.ALL or CascadeType.PERSIST on the
* OneToMany, OneToOne or ManyToMany annotation.
*
*
* In this example below the details property has a CascadeType.ALL set so
* saving an order will also save all its details.
*
*
* {@code
* public class Order { ...
*
* @OneToMany(cascade=CascadeType.ALL, mappedBy="order")
* List details;
* ...
* }
* }
*
*
* When a save cascades via a OneToMany or ManyToMany Ebean will automatically
* set the 'parent' object to the 'detail' object. In the example below in
* saving the order and cascade saving the order details the 'parent' order
* will be set against each order detail when it is saved.
*
*/
public static void save(Object bean) throws OptimisticLockException {
serverMgr.getDefaultServer().save(bean);
}
/**
* Insert the bean. This is useful when you set the Id property on a bean and
* want to explicitly insert it.
*/
public static void insert(Object bean) {
serverMgr.getDefaultServer().insert(bean);
}
/**
* Insert a collection of beans.
*/
public static void insertAll(Collection beans) {
serverMgr.getDefaultServer().insertAll(beans);
}
/**
* Marks the entity bean as dirty.
*
* This is used so that when a bean that is otherwise unmodified is updated with the version
* property updated.
*
* An unmodified bean that is saved or updated is normally skipped and this marks the bean as
* dirty so that it is not skipped.
*
*
{@code
*
* Customer customer = Ebean.find(Customer, id);
*
* // mark the bean as dirty so that a save() or update() will
* // increment the version property
* Ebean.markAsDirty(customer);
* Ebean.save(customer);
*
* }
*/
public static void markAsDirty(Object bean) throws OptimisticLockException {
serverMgr.getDefaultServer().markAsDirty(bean);
}
/**
* Saves the bean using an update. If you know you are updating a bean then it is preferrable to
* use this update() method rather than save().
*
* Stateless updates: Note that the bean does not have to be previously fetched to call
* update().You can create a new instance and set some of its properties programmatically for via
* JSON/XML marshalling etc. This is described as a 'stateless update'.
*
*
* Optimistic Locking: Note that if the version property is not set when update() is
* called then no optimistic locking is performed (internally ConcurrencyMode.NONE is used).
*
*
* {@link ServerConfig#setUpdatesDeleteMissingChildren(boolean)}: When cascade saving to a
* OneToMany or ManyToMany the updatesDeleteMissingChildren setting controls if any other children
* that are in the database but are not in the collection are deleted.
*
*
* {@link ServerConfig#setUpdateChangesOnly(boolean)}: The updateChangesOnly setting
* controls if only the changed properties are included in the update or if all the loaded
* properties are included instead.
*
*
* {@code
*
* // A 'stateless update' example
* Customer customer = new Customer();
* customer.setId(7);
* customer.setName("ModifiedNameNoOCC");
* ebeanServer.update(customer);
*
* }
*
* @see ServerConfig#setUpdatesDeleteMissingChildren(boolean)
* @see ServerConfig#setUpdateChangesOnly(boolean)
*/
public static void update(Object bean) throws OptimisticLockException {
serverMgr.getDefaultServer().update(bean);
}
/**
* Update the beans in the collection.
*/
public static void updateAll(Collection beans) throws OptimisticLockException {
serverMgr.getDefaultServer().updateAll(beans);
}
/**
* Save all the beans from a Collection.
*/
public static int saveAll(Collection beans) throws OptimisticLockException {
return serverMgr.getDefaultServer().saveAll(beans);
}
/**
* Delete the bean.
*
* This will return true if the bean was deleted successfully or JDBC batch is being used.
*
*
* If there is no current transaction one will be created and committed for
* you automatically.
*
*
* If the bean is configured with @SoftDelete then this will perform a soft
* delete rather than a hard/permanent delete.
*
*
* If the Bean does not have a version property (or loaded version property) and
* the bean does not exist then this returns false indicating that nothing was
* deleted. Note that, if JDBC batch mode is used then this always returns true.
*
*/
public static boolean delete(Object bean) throws OptimisticLockException {
return serverMgr.getDefaultServer().delete(bean);
}
/**
* Delete the bean in permanent fashion (will not use soft delete).
*/
public static boolean deletePermanent(Object bean) throws OptimisticLockException {
return serverMgr.getDefaultServer().deletePermanent(bean);
}
/**
* Delete the bean given its type and id.
*/
public static int delete(Class beanType, Object id) {
return serverMgr.getDefaultServer().delete(beanType, id);
}
/**
* Delete permanent the bean given its type and id.
*/
public static int deletePermanent(Class beanType, Object id) {
return serverMgr.getDefaultServer().deletePermanent(beanType, id);
}
/**
* Delete several beans given their type and id values.
*/
public static int deleteAll(Class beanType, Collection ids) {
return serverMgr.getDefaultServer().deleteAll(beanType, ids);
}
/**
* Delete permanent several beans given their type and id values.
*/
public static int deleteAllPermanent(Class beanType, Collection ids) {
return serverMgr.getDefaultServer().deleteAllPermanent(beanType, ids);
}
/**
* Delete all the beans in the Collection.
*/
public static int deleteAll(Collection beans) throws OptimisticLockException {
return serverMgr.getDefaultServer().deleteAll(beans);
}
/**
* Delete permanent all the beans in the Collection (will not use soft delete).
*/
public static int deleteAllPermanent(Collection beans) throws OptimisticLockException {
return serverMgr.getDefaultServer().deleteAllPermanent(beans);
}
/**
* Refresh the values of a bean.
*
* Note that this resets OneToMany and ManyToMany properties so that if they
* are accessed a lazy load will refresh the many property.
*
*/
public static void refresh(Object bean) {
serverMgr.getDefaultServer().refresh(bean);
}
/**
* Refresh a 'many' property of a bean.
*
* {@code
*
* Order order = ...;
* ...
* // refresh the order details...
* Ebean.refreshMany(order, "details");
*
* }
*
* @param bean
* the entity bean containing the List Set or Map to refresh.
* @param manyPropertyName
* the property name of the List Set or Map to refresh.
*/
public static void refreshMany(Object bean, String manyPropertyName) {
serverMgr.getDefaultServer().refreshMany(bean, manyPropertyName);
}
/**
* Get a reference object.
*
* This is sometimes described as a proxy (with lazy loading).
*
*
* {@code
*
* Product product = Ebean.getReference(Product.class, 1);
*
* // You can get the id without causing a fetch/lazy load
* Integer productId = product.getId();
*
* // If you try to get any other property a fetch/lazy loading will occur
* // This will cause a query to execute...
* String name = product.getName();
*
* }
*
* @param beanType
* the type of entity bean
* @param id
* the id value
*/
public static T getReference(Class beanType, Object id) {
return serverMgr.getDefaultServer().getReference(beanType, id);
}
/**
* Sort the list using the sortByClause which can contain a comma delimited
* list of property names and keywords asc, desc, nullsHigh and nullsLow.
*
* - asc - ascending order (which is the default)
* - desc - Descending order
* - nullsHigh - Treat null values as high/large values (which is the
* default)
* - nullsLow- Treat null values as low/very small values
*
*
* If you leave off any keywords the defaults are ascending order and treating
* nulls as high values.
*
*
* Note that the sorting uses a Comparator and Collections.sort(); and does
* not invoke a DB query.
*
*
* {@code
*
* // find orders and their customers
* List list = Ebean.find(Order.class)
* .fetch("customer")
* .orderBy("id")
* .findList();
*
* // sort by customer name ascending, then by order shipDate
* // ... then by the order status descending
* Ebean.sort(list, "customer.name, shipDate, status desc");
*
* // sort by customer name descending (with nulls low)
* // ... then by the order id
* Ebean.sort(list, "customer.name desc nullsLow, id");
*
* }
*
* @param list
* the list of entity beans
* @param sortByClause
* the properties to sort the list by
*/
public static void sort(List list, String sortByClause) {
serverMgr.getDefaultServer().sort(list, sortByClause);
}
/**
* Find a bean using its unique id. This will not use caching.
*
* {@code
* // Fetch order 1
* Order order = Ebean.find(Order.class, 1);
* }
*
*
* If you want more control over the query then you can use createQuery() and
* Query.findUnique();
*
*
* {@code
* // ... additionally fetching customer, customer shipping address,
* // order details, and the product associated with each order detail.
* // note: only product id and name is fetch (its a "partial object").
* // note: all other objects use "*" and have all their properties fetched.
*
* Query query = Ebean.find(Order.class)
* .setId(1)
* .fetch("customer")
* .fetch("customer.shippingAddress")
* .fetch("details")
* .query();
*
* // fetch associated products but only fetch their product id and name
* query.fetch("details.product", "name");
*
* // traverse the object graph...
*
* Order order = query.findUnique();
* Customer customer = order.getCustomer();
* Address shippingAddress = customer.getShippingAddress();
* List details = order.getDetails();
* OrderDetail detail0 = details.get(0);
* Product product = detail0.getProduct();
* String productName = product.getName();
*
* }
*
* @param beanType
* the type of entity bean to fetch
* @param id
* the id value
*/
@Nullable
public static T find(Class beanType, Object id) {
return serverMgr.getDefaultServer().find(beanType, id);
}
/**
* Create a SqlQuery for executing native sql
* query statements.
*
* Note that you can use raw SQL with entity beans, refer to the SqlSelect
* annotation for examples.
*
*/
public static SqlQuery createSqlQuery(String sql) {
return serverMgr.getDefaultServer().createSqlQuery(sql);
}
/**
* Create a sql update for executing native dml statements.
*
* Use this to execute a Insert Update or Delete statement. The statement will
* be native to the database and contain database table and column names.
*
*
* See {@link SqlUpdate} for example usage.
*
*/
public static SqlUpdate createSqlUpdate(String sql) {
return serverMgr.getDefaultServer().createSqlUpdate(sql);
}
/**
* Create a CallableSql to execute a given stored procedure.
*
* @see CallableSql
*/
public static CallableSql createCallableSql(String sql) {
return serverMgr.getDefaultServer().createCallableSql(sql);
}
/**
* Create a orm update where you will supply the insert/update or delete
* statement (rather than using a named one that is already defined using the
* @NamedUpdates annotation).
*
* The orm update differs from the sql update in that it you can use the bean
* name and bean property names rather than table and column names.
*
*
* An example:
*
*
* {@code
*
* // The bean name and properties - "topic","postCount" and "id"
*
* // will be converted into their associated table and column names
* String updStatement = "update topic set postCount = :pc where id = :id";
*
* Update update = Ebean.createUpdate(Topic.class, updStatement);
*
* update.set("pc", 9);
* update.set("id", 3);
*
* int rows = update.execute();
* System.out.println("rows updated:" + rows);
*
* }
*/
public static Update createUpdate(Class beanType, String ormUpdate) {
return serverMgr.getDefaultServer().createUpdate(beanType, ormUpdate);
}
/**
* Create a CsvReader for a given beanType.
*/
public static CsvReader createCsvReader(Class beanType) {
return serverMgr.getDefaultServer().createCsvReader(beanType);
}
/**
* Create a named query.
*
* For RawSql the named query is expected to be in ebean.xml.
*
*
* @param beanType The type of entity bean
* @param namedQuery The name of the query
* @param The type of entity bean
* @return The query
*/
public static Query createNamedQuery(Class beanType, String namedQuery) {
return serverMgr.getDefaultServer().createNamedQuery(beanType, namedQuery);
}
/**
* Create a query for a type of entity bean.
*
* You can use the methods on the Query object to specify fetch paths,
* predicates, order by, limits etc.
*
*
* You then use findList(), findSet(), findMap() and findUnique() to execute
* the query and return the collection or bean.
*
*
* Note that a query executed by {@link Query#findList()}
* {@link Query#findSet()} etc will execute against the same EbeanServer from
* which is was created.
*
*
* @param beanType
* the class of entity to be fetched
* @return A ORM Query object for this beanType
*/
public static Query createQuery(Class beanType) {
return serverMgr.getDefaultServer().createQuery(beanType);
}
/**
* Parse the Ebean query language statement returning the query which can then
* be modified (add expressions, change order by clause, change maxRows, change
* fetch and select paths etc).
*
* Example
*
* {@code
*
*
* // Find order additionally fetching the customer, details and details.product name.
*
* String eql = "fetch customer fetch details fetch details.product (name) where id = :orderId ";
*
* Query query = Ebean.createQuery(Order.class, eql);
* query.setParameter("orderId", 2);
*
* Order order = query.findUnique();
*
* // This is the same as:
*
* Order order = Ebean.find(Order.class)
* .fetch("customer")
* .fetch("details")
* .fetch("detail.product", "name")
* .setId(2)
* .findUnique();
*
* }
*
* @param beanType The type of bean to fetch
* @param eql The Ebean query
* @param The type of the entity bean
*
* @return The query with expressions defined as per the parsed query statement
*/
public static Query createQuery(Class beanType, String eql) {
return serverMgr.getDefaultServer().createQuery(beanType, eql);
}
/**
* Create a query for a type of entity bean.
*
* This is actually the same as {@link #createQuery(Class)}. The reason it
* exists is that people used to JPA will probably be looking for a
* createQuery method (the same as entityManager).
*
*
* @param beanType
* the type of entity bean to find
* @return A ORM Query object for this beanType
*/
public static Query find(Class beanType) {
return serverMgr.getDefaultServer().find(beanType);
}
/**
* Create an Update query to perform a bulk update.
*
*
{@code
*
* int rows = Ebean.update(Customer.class)
* .set("status", Customer.Status.ACTIVE)
* .set("updtime", new Timestamp(System.currentTimeMillis()))
* .where()
* .gt("id", 1000)
* .update();
*
* }
*
* @param beanType The type of entity bean to update
* @param The type of entity bean
* @return The update query to use
*/
public static UpdateQuery update(Class beanType) {
return serverMgr.getDefaultServer().update(beanType);
}
/**
* Create a filter for sorting and filtering lists of entities locally without
* going back to the database.
*
* This produces and returns a new list with the sort and filters applied.
*
*
* Refer to {@link Filter} for an example of its use.
*
*/
public static Filter filter(Class beanType) {
return serverMgr.getDefaultServer().filter(beanType);
}
/**
* Execute a Sql Update Delete or Insert statement. This returns the number of
* rows that where updated, deleted or inserted. If is executed in batch then
* this returns -1. You can get the actual rowCount after commit() from
* updateSql.getRowCount().
*
* If you wish to execute a Sql Select natively then you should use the
* FindByNativeSql object.
*
*
* Note that the table modification information is automatically deduced and
* you do not need to call the Ebean.externalModification() method when you
* use this method.
*
*
* Example:
*
*
* {@code
*
* // example that uses 'named' parameters
* String s = "UPDATE f_topic set post_count = :count where id = :id"
*
* SqlUpdate update = Ebean.createSqlUpdate(s);
*
* update.setParameter("id", 1);
* update.setParameter("count", 50);
*
* int modifiedCount = Ebean.execute(update);
*
* String msg = "There where " + modifiedCount + "rows updated";
*
* }
*
* @param sqlUpdate
* the update sql potentially with bind values
*
* @return the number of rows updated or deleted. -1 if executed in batch.
*
* @see SqlUpdate
* @see CallableSql
* @see Ebean#execute(CallableSql)
*/
public static int execute(SqlUpdate sqlUpdate) {
return serverMgr.getDefaultServer().execute(sqlUpdate);
}
/**
* For making calls to stored procedures.
*
* Example:
*
*
* {@code
*
* String sql = "{call sp_order_modify(?,?,?)}";
*
* CallableSql cs = Ebean.createCallableSql(sql);
* cs.setParameter(1, 27);
* cs.setParameter(2, "SHIPPED");
* cs.registerOut(3, Types.INTEGER);
*
* Ebean.execute(cs);
*
* // read the out parameter
* Integer returnValue = (Integer) cs.getObject(3);
*
* }
*
* @see CallableSql
* @see Ebean#execute(SqlUpdate)
*/
public static int execute(CallableSql callableSql) {
return serverMgr.getDefaultServer().execute(callableSql);
}
/**
* Execute a TxRunnable in a Transaction with an explicit scope.
*
* The scope can control the transaction type, isolation and rollback
* semantics.
*
*
* {@code
*
* // set specific transactional scope settings
* TxScope scope = TxScope.requiresNew().setIsolation(TxIsolation.SERIALIZABLE);
*
* Ebean.execute(scope, new TxRunnable() {
* public void run() {
* User u1 = Ebean.find(User.class, 1);
* ...
* }
* });
*
* }
*/
public static void execute(TxScope scope, TxRunnable r) {
serverMgr.getDefaultServer().execute(scope, r);
}
/**
* Execute a TxRunnable in a Transaction with the default scope.
*
* The default scope runs with REQUIRED and by default will rollback on any
* exception (checked or runtime).
*
*
* {@code
*
* Ebean.execute(new TxRunnable() {
* public void run() {
* User u1 = Ebean.find(User.class, 1);
* User u2 = Ebean.find(User.class, 2);
*
* u1.setName("u1 mod");
* u2.setName("u2 mod");
*
* Ebean.save(u1);
* Ebean.save(u2);
* }
* });
*
* }
*/
public static void execute(TxRunnable r) {
serverMgr.getDefaultServer().execute(r);
}
/**
* Execute a TxCallable in a Transaction with an explicit scope.
*
* The scope can control the transaction type, isolation and rollback
* semantics.
*
*
* {@code
*
* // set specific transactional scope settings
* TxScope scope = TxScope.requiresNew().setIsolation(TxIsolation.SERIALIZABLE);
*
* Ebean.execute(scope, new TxCallable() {
* public String call() {
* User u1 = Ebean.find(User.class, 1);
* ...
* return u1.getEmail();
* }
* });
*
* }
*
*/
public static T execute(TxScope scope, TxCallable c) {
return serverMgr.getDefaultServer().execute(scope, c);
}
/**
* Execute a TxCallable in a Transaction with the default scope.
*
* The default scope runs with REQUIRED and by default will rollback on any
* exception (checked or runtime).
*
*
* This is basically the same as TxRunnable except that it returns an Object
* (and you specify the return type via generics).
*
*
* {@code
*
* Ebean.execute(new TxCallable() {
* public String call() {
* User u1 = Ebean.find(User.class, 1);
* User u2 = Ebean.find(User.class, 2);
*
* u1.setName("u1 mod");
* u2.setName("u2 mod");
*
* Ebean.save(u1);
* Ebean.save(u2);
*
* return u1.getEmail();
* }
* });
*
* }
*/
public static T execute(TxCallable c) {
return serverMgr.getDefaultServer().execute(c);
}
/**
* Inform Ebean that tables have been modified externally. These could be the
* result of from calling a stored procedure, other JDBC calls or external
* programs including other frameworks.
*
* If you use Ebean.execute(UpdateSql) then the table modification information
* is automatically deduced and you do not need to call this method yourself.
*
*
* This information is used to invalidate objects out of the cache and
* potentially text indexes. This information is also automatically broadcast
* across the cluster.
*
*
* If there is a transaction then this information is placed into the current
* transactions event information. When the transaction is committed this
* information is registered (with the transaction manager). If this
* transaction is rolled back then none of the transaction event information
* registers including the information you put in via this method.
*
*
* If there is NO current transaction when you call this method then this
* information is registered immediately (with the transaction manager).
*
*
* @param tableName
* the name of the table that was modified
* @param inserts
* true if rows where inserted into the table
* @param updates
* true if rows on the table where updated
* @param deletes
* true if rows on the table where deleted
*/
public static void externalModification(String tableName, boolean inserts, boolean updates, boolean deletes) {
serverMgr.getDefaultServer().externalModification(tableName, inserts, updates, deletes);
}
/**
* Return the BeanState for a given entity bean.
*
* This will return null if the bean is not an enhanced entity bean.
*
*/
public static BeanState getBeanState(Object bean) {
return serverMgr.getDefaultServer().getBeanState(bean);
}
/**
* Return the manager of the server cache ("L2" cache).
*
*/
public static ServerCacheManager getServerCacheManager() {
return serverMgr.getDefaultServer().getServerCacheManager();
}
/**
* Return the BackgroundExecutor service for asynchronous processing of
* queries.
*/
public static BackgroundExecutor getBackgroundExecutor() {
return serverMgr.getDefaultServer().getBackgroundExecutor();
}
/**
* Return the JsonContext for reading/writing JSON.
*/
public static JsonContext json() {
return serverMgr.getDefaultServer().json();
}
}