JDBCUtilsByDruid.java

package com.charlie.dao_.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

/**
 * 基于Druid数据库连接池的工具类
 */
public class JDBCUtilsByDruid {
    private static final String druidProperties = "src\\druid.properties";
    private static final DataSource ds;

    static {
        Properties properties = new Properties();
        try {
            properties.load(new FileInputStream(druidProperties));
            ds = DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

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

    // 关闭连接，注意：在数据库连接池技术中，close不是真正地断掉连接
    // 而是把使用的 Connection对象 放回到连接池
    public static void close(ResultSet set, PreparedStatement preparedStatement, Connection connection) {
        try {
            if (set != null) {
                set.close();
            }
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            if (connection != null) {
                connection.close();
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}