feat: 无法顺序读取数据源配置时，可以手动指定默认数据源，关闭 https://gitee.com/mybatis-flex/mybatis-flex/issues/I9VBRJ。

mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/MultiDataSourceAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2022-2025, Mybatis-Flex (fuhai999@gmail.com).
+ *  Copyright (c) 2022-2024, Mybatis-Flex (fuhai999@gmail.com).
  *  <p>
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -19,6 +19,8 @@ import com.mybatisflex.core.datasource.DataSourceBuilder;
 import com.mybatisflex.core.datasource.DataSourceDecipher;
 import com.mybatisflex.core.datasource.DataSourceManager;
 import com.mybatisflex.core.datasource.FlexDataSource;
+import com.mybatisflex.core.exception.FlexExceptions;
+import com.mybatisflex.core.util.MapUtil;
 import com.mybatisflex.spring.boot.MybatisFlexProperties.SeataConfig;
 import com.mybatisflex.spring.datasource.DataSourceAdvice;
 import io.seata.rm.datasource.DataSourceProxy;
@@ -55,6 +57,7 @@ import java.util.Map;
     "com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure"})
 public class MultiDataSourceAutoConfiguration {
 
+    private final String master;
 
     private final Map<String, Map<String, String>> dataSourceProperties;
 
@@ -70,6 +73,7 @@ public class MultiDataSourceAutoConfiguration {
         dataSourceProperties = properties.getDatasource();
         dataSourceDecipher = dataSourceDecipherProvider.getIfAvailable();
         seataConfig = properties.getSeataConfig();
+        master = properties.getDefaultDatasourceKey();
     }
 
     @Bean
@@ -84,8 +88,24 @@ public class MultiDataSourceAutoConfiguration {
                 DataSourceManager.setDecipher(dataSourceDecipher);
             }
 
-            for (Map.Entry<String, Map<String, String>> entry : dataSourceProperties.entrySet()) {
+            if (master != null) {
+                Map<String, String> map = dataSourceProperties.remove(master);
+                if (map != null) {
+                    flexDataSource = addDataSource(MapUtil.entry(master, map), flexDataSource);
+                } else {
+                    throw FlexExceptions.wrap("没有找到默认数据源 \"%s\" 对应的配置，请检查您的多数据源配置。", master);
+                }
+            }
 
+            for (Map.Entry<String, Map<String, String>> entry : dataSourceProperties.entrySet()) {
+                flexDataSource = addDataSource(entry, flexDataSource);
+            }
+        }
+
+        return flexDataSource;
+    }
+
+    private FlexDataSource addDataSource(Map.Entry<String, Map<String, String>> entry, FlexDataSource flexDataSource) {
         DataSource dataSource = new DataSourceBuilder(entry.getValue()).build();
         DataSourceManager.decryptDataSource(dataSource);
 
@@ -102,9 +122,6 @@ public class MultiDataSourceAutoConfiguration {
         } else {
             flexDataSource.addDataSource(entry.getKey(), dataSource, false);
         }
-            }
-        }
-
         return flexDataSource;
     }
 

mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/MybatisFlexProperties.java

@@ -1,12 +1,12 @@
 /*
- *    Copyright 2015-2022 the original author or authors.
+ *  Copyright (c) 2022-2024, Mybatis-Flex (fuhai999@gmail.com).
- *
+ *  <p>
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
- *
+ *  <p>
- *       https://www.apache.org/licenses/LICENSE-2.0
+ *  http://www.apache.org/licenses/LICENSE-2.0
- *
+ *  <p>
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -21,7 +21,11 @@ import org.apache.ibatis.io.VFS;
 import org.apache.ibatis.logging.Log;
 import org.apache.ibatis.mapping.ResultSetType;
 import org.apache.ibatis.scripting.LanguageDriver;
-import org.apache.ibatis.session.*;
+import org.apache.ibatis.session.AutoMappingBehavior;
+import org.apache.ibatis.session.AutoMappingUnknownColumnBehavior;
+import org.apache.ibatis.session.Configuration;
+import org.apache.ibatis.session.ExecutorType;
+import org.apache.ibatis.session.LocalCacheScope;
 import org.apache.ibatis.type.JdbcType;
 import org.apache.ibatis.type.TypeHandler;
 import org.springframework.boot.context.properties.ConfigurationProperties;
@@ -52,6 +56,8 @@ public class MybatisFlexProperties {
 
     private static final ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
 
+    private String defaultDatasourceKey;
+
     /**
      * <p>多数据源的配置。
      *
@@ -160,6 +166,14 @@ public class MybatisFlexProperties {
         this.adminConfig = adminConfig;
     }
 
+    public String getDefaultDatasourceKey() {
+        return defaultDatasourceKey;
+    }
+
+    public void setDefaultDatasourceKey(String defaultDatasourceKey) {
+        this.defaultDatasourceKey = defaultDatasourceKey;
+    }
+
     /**
      * @since 1.1.0
      */