java-tutorials/libraries/src/main/java/com/baeldung/hikaricp/DataSource.java

package com.baeldung.hikaricp;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

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

public class DataSource {

    private static HikariConfig config = new HikariConfig();
    private static HikariDataSource ds;

    static {
       /* config = new HikariConfig("datasource.properties");

        Properties props = new Properties();
        props.setProperty("dataSourceClassName", "org.postgresql.ds.PGSimpleDataSource");
        props.setProperty("dataSource.user", "postgres");
        props.setProperty("dataSource.password", "postgres");
        props.setProperty("dataSource.databaseName", "postgres");
        props.setProperty("dataSource.portNumber", "5432");
        props.setProperty("dataSource.serverName", "localhost");
        props.put("dataSource.logWriter", new PrintWriter(System.out));
        config = new HikariConfig(props);*/

        config.setJdbcUrl("jdbc:postgresql://localhost:5432/postgres");
        config.setUsername("postgres");
        config.setPassword("postgres");
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "250");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
        ds = new HikariDataSource(config);

       /* ds.setJdbcUrl("jdbc:postgresql://localhost:5432/postgres");
        ds.setUsername("postgres");
        ds.setPassword("postgres");*/
    }

    private DataSource() {
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

}