import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/**
 * DruidJDBC工具类
 */
public class DruidJdbcUtils {
    private static DataSource ds = null;
    static {
        try {
            Properties properties = new Properties();
            properties.load(new FileInputStream("D:\\系统资源\\系统默认\\桌面\\javawebdemo\\src\\druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    /**
     * 获取数据库连接池连接
     *
     * @return 一个连接池连接
     */
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
    /**
     * 关闭连接
     * 并不是真的关闭连接，而是把Connection对象放回连接池
     *
     * @param resultSet  结果集
     * @param statement  用于执行sql语句的对象
     * @param connection 数据库连接
     */
    public static void close(ResultSet resultSet, Statement statement, Connection connection) {
        try {
            if (resultSet != null) {
                resultSet.close();
            }
            if (statement != null) {
                statement.close();
            }
            if (connection != null) {
                connection.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}