常用的四大连接池技术

mysql数据库,Maven 构建

1.c3p0的连接

pom.xml 注意导的包 c3p0 有两个包(都要有)

            com.mchange
            c3p0
            0.9.5.5
        
        
            mysql
            mysql-connector-java
            5.1.42
        

第一种方式:（不要配置文件）

 public static  void main(String[] args) throws SQLException, PropertyVetoException {
        ComboPooledDataSource sc=new ComboPooledDataSource();
        sc.setDriverClass("com.mysql.jdbc.Driver");
        sc.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        sc.setUser("root");
        sc.setPassword("root");
        sc.setInitialPoolSize(10);
        Connection conn=sc.getConnection();
        System.out.println(conn);
    }

第二种方式(通过配置文件)

配置文件名 c3p0-config.xml

    
        
        com.mysql.jdbc.Driver
        jdbc:mysql:///test
        root
        root

        
        
        5
        
        10
        
        10
        
        100
        
        50
        
        2

    

java测试代码

public static  void main(String[] args) throws SQLException {
        ComboPooledDataSource sc=new ComboPooledDataSource("hellc3p0");
        Connection conn=sc.getConnection();
        System.out.println(conn);
    }

2.DBCP

pom.xml

 
            commons-dbcp
            commons-dbcp
            1.4

    
            mysql
            mysql-connector-java
            5.1.42
        

第一种方式

        BasicDataSource source =new BasicDataSource();
        source.setDriverClassName("com.mysql.jdbc.Driver");
        source.setUrl("jdbc:mysql:///test");
        source.setUsername("root");
        source.setPassword("root");
        source.setInitialSize(10);
        source.setMaxActive(10);
        Connection conn=source.getConnection();
        System.out.println(conn);

第二种方式 配置文件

文件名 dbcp.properties

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///test
username=root
password=root
initialSize=10

测试代码

 Properties pros = new Properties();
        //方式1：
	    InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("dbcp.properties");
        //方式2：
      // FileInputStream is = new FileInputStream(new File("src\\main\\resources\\dbcp.properties"));
        pros.load(is);
        DataSource source = BasicDataSourceFactory.createDataSource(pros);
        Connection conn = source.getConnection();
        System.out.println(conn);

3.druid

pom.xml

        
            com.alibaba
            druid
            1.1.23
        
    
            mysql
            mysql-connector-java
            5.1.42
        

druid.properties

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///test
username=root
password=root
initialSize=10
maxActive=10

测试代码

 public static void main(String[] args) throws Exception {
        DataSource source1;
        Properties pros = new Properties();
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("druid.properties");
        pros.load(is);
        source1 = DruidDataSourceFactory.createDataSource(pros);
        Connection conn = source1.getConnection();
        System.out.println(conn);
    }

4.HikariCP

导入依赖pom.xml

 
            com.zaxxer
            HikariCP
            3.4.5
          

            mysql
            mysql-connector-java
            5.1.42
        

第一种方式:

 public static void main(String[] args) throws SQLException {
        //实例化类
        HikariConfig hikariConfig = new HikariConfig();
        //设置url
        hikariConfig.setJdbcUrl("jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8");
        //数据库帐号
        hikariConfig.setUsername("root");
        //数据库密码
        hikariConfig.setPassword("root");
        hikariConfig.addDataSourceProperty("cachePrepStmts", "true");
        hikariConfig.addDataSourceProperty("prepStmtCacheSize", "250");
        hikariConfig.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
        HikariDataSource ds = new HikariDataSource(hikariConfig);
        Connection conn = null;
        Statement statement = null;
        ResultSet rs = null;
        try {
            conn = ds.getConnection();
            System.out.println(conn);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.close();
            }
        }
    }

第二种 方式 通过配置文件

HiKari.properties 只要要这三个就可以了，连接

jdbcUrl=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
username=root
password=root

测试代码：

public static void main(String[] args) throws IOException, SQLException {
        Properties pros = new Properties();
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("Hikari.properties");
        pros.load(is);
        HikariConfig hikariConfig = new HikariConfig(pros);
        HikariDataSource ds = new HikariDataSource(hikariConfig);
        Connection conn = null;
        Statement statement = null;
        ResultSet rs = null;
        try {
            conn = ds.getConnection();
            System.out.println(conn);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.close();
            }
        }
    }