Java實(shí)戰(zhàn)：hutool-db實(shí)現(xiàn)多數(shù)據(jù)源配置


我們?cè)谌粘ｉ_發(fā)中，經(jīng)常會(huì)用到一個(gè)系統(tǒng)需要鏈接多個(gè)數(shù)據(jù)庫(kù)來(lái)實(shí)現(xiàn)業(yè)務(wù)的需求，比如多個(gè)系統(tǒng)之間數(shù)據(jù)調(diào)用、兩個(gè)數(shù)據(jù)之間同步等等。
今天給大家分享使用Hutool-db實(shí)現(xiàn)多數(shù)據(jù)源配置，大家一起來(lái)學(xué)習(xí)一下吧！
1、hutool-db介紹
Hutool-db是一個(gè)在JDBC基礎(chǔ)上封裝的數(shù)據(jù)庫(kù)操作工具類，通過包裝，使用ActiveRecord思想操作數(shù)據(jù)庫(kù)。在Hutool-db中，使用Entity（本質(zhì)上是個(gè)Map）代替Bean來(lái)使數(shù)據(jù)庫(kù)操作更加靈活，同時(shí)提供Bean和Entity的轉(zhuǎn)換提供傳統(tǒng)ORM的兼容支持。



1.  數(shù)據(jù)源 DataSource
2.  SQL執(zhí)行器 SqlExecutor
3.  CRUD的封裝 Db、SqlConnRunner SqlRunner
4.  支持事務(wù)的CRUD封裝 Session
5.  各種結(jié)果集處理類 handler
6.  數(shù)據(jù)庫(kù)的一些工具方法匯總 DbUtil




2、新建一個(gè)Maven項(xiàng)目
2.1 導(dǎo)入依賴包

   <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>sqljdbc4</artifactId>
            <version>4.0</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-db</artifactId>
            <version>5.7.22</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.9</version>
        </dependency>



2.2 新建db.setting配置文件
src/main/resources/config/db.setting

[mysql]
url = jdbc:mysql://127.0.0.1:3306/mydb?characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
username = root
password = 123456
driver = com.mysql.jdbc.Driver
[sqlserver]
url = jdbc:sqlserver://192.168.33.4:1433;DatabaseName=DB
username = sa
password = 123456
driver = com.microsoft.sqlserver.jdbc.SQLServerDriver
 



2.3 新建測(cè)試demo

/**
     * 測(cè)試mysql
     */
    private static void testMysql() {
        DataSource ds = DSFactory.get("mysql");
        Db.use(ds);
        Connection conn = null;
        try {
            conn = ds.getConnection();
            // 插入語(yǔ)句
            SqlExecutor.execute(conn, "insert into t_user (name,age) value ('小張',35)");
            // 更新語(yǔ)句
            SqlExecutor.execute(conn, "update t_user set name='小明002' where id=2 ");
            // 刪除語(yǔ)句
            SqlExecutor.execute(conn, "delete from t_user  where id=2 ");
            List<Entity> entityList = SqlExecutor.query(conn, "select * from t_user limit 50", new EntityListHandler());
            for (Entity entity : entityList) {
                System.out.println(entity.get("name"));
            }
        } catch (SQLException e) {

        } finally {
            DbUtil.close(conn);
        }
    }

    /**
     * 測(cè)試sqlserver
     */
    private static void testSqlServer() {
        DataSource ds = DSFactory.get("sqlserver");
        Connection conn = null;
        try {
            conn = ds.getConnection();
            List<Entity> entityList = SqlExecutor.query(conn, "select * from t_user", new EntityListHandler());
            for (Entity entity : entityList) {
                System.out.println(entity.get("username"));
            }
        } catch (SQLException e) {

        } finally {
            DbUtil.close(conn);
        }
    }

    /**
     * 直接代碼寫jdbc數(shù)據(jù)源 不推薦的方式
     */
    private static void testDefineJdbc() {
        DruidDataSource ds = new DruidDataSource();
        ds.setUrl("jdbc:mysql://127.0.0.1:3306/mydb?characterEncoding=utf-8&useSSL=false&serverTimezone=GMT");
        ds.setUsername("root");
        ds.setPassword("12345678");
        Connection conn = null;
        try {
            conn = ds.getConnection();
            List<Entity> entityList = SqlExecutor.query(conn, "select * from t_user", new EntityListHandler());
            for (Entity entity : entityList) {
                System.out.println(entity.get("name"));
            }
        } catch (SQLException e) {

        } finally {
            DbUtil.close(conn);
        }
    }
 



作者：郝光明 IT技術(shù)分享社區(qū)


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