'修改qtask相关'

src/main/java/net/tccn/dbq/jdbc/api/DbSourceMysql.java

@@ -22,11 +22,17 @@ public class DbSourceMysql implements DbSource {
 
     private String accountKey;
     private DbAccount dbAccount;
+    private String catalog;
 
     public DbSourceMysql(DbAccount dbAccount) {
         this.dbAccount = dbAccount;
         this.accountKey = dbAccount.accountKey();
     }
+    public DbSourceMysql(DbAccount dbAccount, String catalog) {
+        this.dbAccount = dbAccount;
+        this.catalog = catalog;
+        this.accountKey = dbAccount.accountKey();
+    }
 
     @Override
     public <T> List<T> findList(String sql, Class<T> type) {
@@ -136,7 +142,15 @@ public class DbSourceMysql implements DbSource {
     }
 
     private Connection connection() {
-        return connection(0);
+        Connection connection = connection(0);
+        if (connection != null && catalog != null) {
+            try {
+                connection.setCatalog(catalog); //还回连接的时候是否需要重置catalog？ 后续观察
+            } catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+        return connection;
     }
     private Connection connection(int n) {
         LinkedBlockingQueue<Connection> queue = conns.getOrDefault(accountKey, new LinkedBlockingQueue<>(15));