for #2335 add seata maven dependencies.

pom.xml

@@ -65,6 +65,7 @@
         
         <javax.transaction.version>1.1</javax.transaction.version>
         <atomikos.version>4.0.6</atomikos.version>
+        <seata.version>0.5.1</seata.version>
         
         <curator.version>2.10.0</curator.version>
         <opentracing.version>0.30.0</opentracing.version>
@@ -193,6 +194,17 @@
                 <artifactId>transactions-jdbc</artifactId>
                 <version>${atomikos.version}</version>
             </dependency>
+    
+            <dependency>
+                <groupId>io.seata</groupId>
+                <artifactId>seata-rm-datasource</artifactId>
+                <version>${seata.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.seata</groupId>
+                <artifactId>seata-tm</artifactId>
+                <version>${seata.version}</version>
+            </dependency>
 
             <dependency>
                 <groupId>org.apache.curator</groupId>

sharding-transaction/sharding-transaction-base/sharding-transaction-base-seata-at/pom.xml

@@ -27,5 +27,31 @@
     </parent>
     <artifactId>sharding-transaction-base-seata-at</artifactId>
     <name>${project.artifactId}</name>
+    
+    <dependencies>
+        <dependency>
+            <groupId>io.seata</groupId>
+            <artifactId>seata-rm-datasource</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.seata</groupId>
+            <artifactId>seata-tm</artifactId>
+        </dependency>
+    </dependencies>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                    <testSource>1.8</testSource>
+                    <testTarget>1.8</testTarget>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
 </project>

sharding-transaction/sharding-transaction-base/sharding-transaction-base-seata-at/src/main/java/org/apache/shardingsphere/transaction/base/seata/at/SeataATShardingTransactionManager.java

@@ -22,8 +22,11 @@ import org.apache.shardingsphere.transaction.core.ResourceDataSource;
 import org.apache.shardingsphere.transaction.core.TransactionType;
 import org.apache.shardingsphere.transaction.spi.ShardingTransactionManager;
 
+import javax.sql.DataSource;
 import java.sql.Connection;
 import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
 
 /**
  * Seata AT sharding transaction manager.
@@ -32,6 +35,8 @@ import java.util.Collection;
  */
 public final class SeataATShardingTransactionManager implements ShardingTransactionManager {
     
+    private final Map<String, DataSource> dataSourceMap = new HashMap<>();
+    
     @Override
     public void init(final DatabaseType databaseType, final Collection<ResourceDataSource> resourceDataSources) {