?我們在日常開發(fā)中，經(jīng)常會用到一個系統(tǒng)需要鏈接多個數(shù)據(jù)庫來實現(xiàn)業(yè)務的需求，比如多個系統(tǒng)之間數(shù)據(jù)調(diào)用、兩個數(shù)據(jù)之間同步等等。
今天給大家分享使用Hutool-db實現(xiàn)多數(shù)據(jù)源配置，大家一起來學習一下吧！
1、hutool-db介紹
Hutool-db是一個在JDBC基礎上封裝的數(shù)據(jù)庫操作工具類，通過包裝，使用ActiveRecord思想操作數(shù)據(jù)庫。在Hutool-db中，使用Entity（本質(zhì)上是個Map）代替Bean來使數(shù)據(jù)庫操作更加靈活，同時提供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. 支持事務的CRUD封裝 Session
5. 各種結(jié)果集處理類 handler
6. 數(shù)據(jù)庫的一些工具方法匯總 DbUtil
2、新建一個Maven項目
2.1 導入依賴包
<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 新建測試demo
/**
* 測試mysql
*/
private static void testMysql() {
DataSource ds = DSFactory.get("mysql");
Db.use(ds);
Connection conn = null;
try {
conn = ds.getConnection();
// 插入語句
SqlExecutor.execute(conn, "insert into t_user (name,age) value ('小張',35)");
// 更新語句
SqlExecutor.execute(conn, "update t_user set name='小明002' where id=2 ");
// 刪除語句
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&serverTimeznotallow=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);
}
}
