add testcase for issue #1818

src/test/java/com/alibaba/druid/bvt/sql/schemaStat/SchemaStatTest14.java

@@ -0,0 +1,46 @@
+package com.alibaba.druid.bvt.sql.schemaStat;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.parser.SQLParserUtils;
+import com.alibaba.druid.sql.parser.SQLStatementParser;
+import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
+import com.alibaba.druid.stat.TableStat;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+import java.util.Set;
+
+public class SchemaStatTest14 extends TestCase {
+
+    public void test_schemaStat() throws Exception {
+        String sql = "delete r from t_res r where id=1 ";
+
+        String dbType = JdbcConstants.MYSQL;
+        SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+
+        SchemaStatVisitor statVisitor = SQLUtils.createSchemaStatVisitor(dbType);
+        stmt.accept(statVisitor);
+
+        Set<TableStat.Relationship> relationships = statVisitor.getRelationships();
+        for (TableStat.Relationship relationship : relationships) {
+            System.out.println(relationship); // table1.id = table2.id
+        }
+
+        System.out.println("Tables : " + statVisitor.getTables());
+        System.out.println(statVisitor.getColumns());
+//        System.out.println(statVisitor.getGroupByColumns()); // group by
+        System.out.println("relationships : " + statVisitor.getRelationships()); // group by
+        System.out.println(statVisitor.getConditions());
+        assertEquals(0, relationships.size());
+
+        assertEquals(1, statVisitor.getColumns().size());
+        assertEquals(1, statVisitor.getConditions().size());
+        assertEquals(0, statVisitor.getFunctions().size());
+
+        assertTrue(statVisitor.containsTable("t_res"));
+        assertTrue(statVisitor.containsColumn("t_res", "id"));
+    }
+}