add parse Dsn

Author: litongjava

docs/zh/15_table-to-json/04.md

@@ -227,6 +227,103 @@ public class TableToJsonConfig {
 
 ```
 
+#### 解析 DSN
+
+配置 dsn
+
+```
+DATABASE_DSN=postgresql://postgres:[email protected]/student
+```
+
+解析并配置
+
+```java
+import javax.sql.DataSource;
+
+import com.jfinal.template.Engine;
+import com.jfinal.template.source.ClassPathSourceFactory;
+import com.litongjava.jfinal.aop.annotation.AConfiguration;
+import com.litongjava.jfinal.aop.annotation.AInitialization;
+import com.litongjava.jfinal.plugin.activerecord.ActiveRecordPlugin;
+import com.litongjava.jfinal.plugin.activerecord.OrderedFieldContainerFactory;
+import com.litongjava.jfinal.plugin.activerecord.dialect.PostgreSqlDialect;
+import com.litongjava.jfinal.plugin.hikaricp.DsContainer;
+import com.litongjava.tio.boot.constatns.TioBootConfigKeys;
+import com.litongjava.tio.boot.server.TioBootServer;
+import com.litongjava.tio.utils.dsn.DSNParser;
+import com.litongjava.tio.utils.dsn.JdbcInfo;
+import com.litongjava.tio.utils.environment.EnvironmentUtils;
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+
+@AConfiguration
+public class TableToJsonConfig {
+
+  public DataSource dataSource() {
+    String dsn = EnvironmentUtils.get("DATABASE_DSN");
+    if (dsn == null) {
+      return null;
+    }
+
+    JdbcInfo jdbc = new DSNParser().parse(dsn);
+
+    int maximumPoolSize = EnvironmentUtils.getInt("jdbc.MaximumPoolSize", 2);
+
+    HikariConfig config = new HikariConfig();
+    // config
+    config.setJdbcUrl(jdbc.getUrl());
+    config.setUsername(jdbc.getUser());
+    config.setPassword(jdbc.getPswd());
+    config.setMaximumPoolSize(maximumPoolSize);
+
+    HikariDataSource hikariDataSource = new HikariDataSource(config);
+
+    // set datasource
+    DsContainer.setDataSource(hikariDataSource);
+    // add destroy
+    TioBootServer.me().addDestroyMethod(hikariDataSource::close);
+    return hikariDataSource;
+  }
+  /*
+   *
+   * config ActiveRecordPlugin
+   */
+
+  @AInitialization
+  public void activeRecordPlugin() {
+    // get dataSource
+    DataSource dataSource = dataSource();
+    if (dataSource == null) {
+      return;
+    }
+    // get env key
+    String property = EnvironmentUtils.get(TioBootConfigKeys.APP_ENV);
+
+    // create arp
+    ActiveRecordPlugin arp = new ActiveRecordPlugin(dataSource);
+    arp.setContainerFactory(new OrderedFieldContainerFactory());
+    if ("dev".equals(property)) {
+      arp.setDevMode(true);
+    }
+
+    arp.setDialect(new PostgreSqlDialect());
+
+    // config engine
+    Engine engine = arp.getEngine();
+    engine.setSourceFactory(new ClassPathSourceFactory());
+    engine.setCompressorOn(' ');
+    engine.setCompressorOn('\n');
+    // add sql file
+    // arp.addSqlTemplate("/sql/all_sqls.sql");
+    // start
+    arp.start();
+    // add stop
+    TioBootServer.me().addDestroyMethod(arp::stop);
+  }
+}
+
+```
+
 #### 编写 Controller
 
 查询 student 表中的所有数据,代码如下