Базы данных

SQL

Sponge предоставляет удобную абстракцию для установки JDBC подключения к базе данных, которая берёт на себя сложности по установке эффективного соединения из JDBC URL.

While the SQL service supports any JDBC connector, the Forge implementation of Sponge only ships with the most common:

• MySQL

• Sqlite

• H2

Предупреждение

Because Sqlite has many limitations, its usage is strongly discouraged except in cases where legacy compatibility is required. H2 is our recommended file-backed database implementation.

Usage

A data source can be accessed through the plugin’s service manager:

import org.spongepowered.api.Sponge;
import org.spongepowered.api.service.sql.SqlService;

import java.sql.Connection;
import java.sql.SQLException;

private SqlService sql;
public javax.sql.DataSource getDataSource(String jdbcUrl) throws SQLException {
    if (sql == null) {
        sql = Sponge.getServiceManager().provide(SqlService.class).get();
    }
    return sql.getDataSource(jdbcUrl);
}

// Later on
public void myMethodThatQueries() throws SQLException {
    Connection conn = getDataSource("jdbc:h2:imalittledatabaseshortandstout.db").getConnection();
    try {
        conn.prepareStatement("SELECT * FROM test_tbl").execute();
    } finally {
        conn.close();
    }

}

The SQL service provides a pooled connection, so getting a connection from the returned DataSource is not expensive. Therefore, we recommended not keeping connections around, and closing them soon after use instead, as shown in the above example. (Proper resource management means you do have to close connections).

NoSQL

Sponge does not currently provide any special abstraction over NoSQL databases (MongoDB etc). Plugins that wish to use NoSQL databases must provide their own connectors.