Package com.djrapitops.plan.query

Interface QueryService

public interface QueryService

Service for Query API.

Requires Capability QUERY_API

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	QueryService.Holder
static interface	QueryService.ThrowingConsumer<T>	See https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html
static interface	QueryService.ThrowingFunction<T,R>	See https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html
static interface	QueryService.VoidFunction	See https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html

Method Summary

Modifier and Type	Method	Description
java.util.concurrent.Future<?>	execute(java.lang.String sql, QueryService.ThrowingConsumer<java.sql.PreparedStatement> performStatement)	Execute SQL against Plan database.
CommonQueries	getCommonQueries()	Perform some commonly wanted queries.
java.lang.String	getDBType()	Get what kind of database is in use.
static QueryService	getInstance()	Obtain instance of QueryService.
java.util.Optional<java.util.UUID>	getServerUUID()	Get the UUID of this server.
<T> T	query(java.lang.String sql, QueryService.ThrowingFunction<java.sql.PreparedStatement,T> performQuery)	Perform a query against Plan database.
void	subscribeDataClearEvent(QueryService.VoidFunction eventListener)	Used for getting notified about removal of ALL data.
void	subscribeToPlayerRemoveEvent(java.util.function.Consumer<java.util.UUID> eventListener)	Used for getting notified about removal of player data.

Method Detail

getInstance

static QueryService getInstance()

Obtain instance of QueryService.

Returns:

QueryService implementation.

Throws:

java.lang.NoClassDefFoundError - If Plan is not installed and this class can not be found or if older Plan version is installed.

java.lang.IllegalStateException - If Plan is installed, but not enabled.

getDBType

java.lang.String getDBType()

Get what kind of database is in use.

Returns:

H2, SQLITE or MYSQL

Throws:

java.lang.IllegalStateException - If database has not been initialized (Plugin failed to enable)

query

<T> T query(java.lang.String sql,
            QueryService.ThrowingFunction<java.sql.PreparedStatement,T> performQuery)
     throws java.lang.IllegalStateException

Perform a query against Plan database.

Blocks thread until query is complete.

Type Parameters:

T - Type of results.

Parameters:

sql - SQL String to execute, can contain parameterized queries (?).

performQuery - set your parameters to the PreparedStatement and execute the query, return results.

Returns:

The object returned by results.

Throws:

java.lang.IllegalStateException - If something goes wrong with the query. SQLException might be as cause.

execute

java.util.concurrent.Future<?> execute(java.lang.String sql,
                                       QueryService.ThrowingConsumer<java.sql.PreparedStatement> performStatement)
                                throws java.lang.IllegalStateException

Execute SQL against Plan database.

Does not block thread, SQL is executed in a single transaction to the database.

Differs from query(String, ThrowingFunction) in that no results are returned.

Parameters:

sql - SQL String to execute, can contain parameterized queries (?).

performStatement - set your parameters to the PreparedStatement and execute the statement.

Returns:

A Future that tells when the transaction has completed. Blocks thread if Future#get is called.

Throws:

java.lang.IllegalStateException - If something goes wrong with the query. SQLException might be as cause.

subscribeToPlayerRemoveEvent

void subscribeToPlayerRemoveEvent(java.util.function.Consumer<java.util.UUID> eventListener)

Used for getting notified about removal of player data.

SQL for removing this player's data should be executed when this occurs.

Example usage: subscribeToPlayerRemoveEvent(playerUUID -> { do stuff })

Parameters:

eventListener - Functional interface that is called on the event.

subscribeDataClearEvent

void subscribeDataClearEvent(QueryService.VoidFunction eventListener)

Used for getting notified about removal of ALL data.

SQL for removing all extra tables (and data) should be performed

Example usage: subscribeDataClearEvent(() -> { do stuff })

Parameters:

eventListener - Functional interface that is called on the event.

getServerUUID

java.util.Optional<java.util.UUID> getServerUUID()

Get the UUID of this server.

Returns:

Optinal of the server UUID, empty if server did not start properly.

getCommonQueries

CommonQueries getCommonQueries()

Perform some commonly wanted queries.

Returns:

CommonQueries implementation.

Throws:

java.lang.IllegalStateException - If database has not been initialized (Plugin failed to enable)