fixed #320

Author: terrymanu

RELEASE-NOTES.md

@@ -9,6 +9,7 @@
 1. [ISSUE #308](https://github.com/dangdangdotcom/sharding-jdbc/issues/308) 数据库原生的自增GeneratedKey的返回无效
 1. [ISSUE #309](https://github.com/dangdangdotcom/sharding-jdbc/issues/310) 子查询中的orderby和groupby不列入解析上下文
 1. [ISSUE #313](https://github.com/dangdangdotcom/sharding-jdbc/issues/313) 支持<>操作符
+1. [ISSUE #320](https://github.com/dangdangdotcom/sharding-jdbc/issues/320) GROUP BY + LIMIT的SQL改写错误
 
 ## 1.5.0
 

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parsing/parser/dialect/oracle/OracleSelectParser.java

@@ -186,7 +186,7 @@ protected void parseGroupBy() {
             if (getSqlParser().skipIfEqual(DefaultKeyword.HAVING)) {
                 throw new UnsupportedOperationException("Cannot support Having");
             }
-            getSelectStatement().setGroupByLastPosition(getSqlParser().getLexer().getCurrentToken().getEndPosition());
+            getSelectStatement().setGroupByLastPosition(getSqlParser().getLexer().getCurrentToken().getEndPosition() - getSqlParser().getLexer().getCurrentToken().getLiterals().length());
         }
     }
 

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parsing/parser/statement/dql/select/AbstractSelectParser.java

@@ -252,7 +252,7 @@ protected void parseGroupBy() {
             if (sqlParser.skipIfEqual(DefaultKeyword.HAVING)) {
                 throw new UnsupportedOperationException("Cannot support Having");
             }
-            selectStatement.setGroupByLastPosition(sqlParser.getLexer().getCurrentToken().getEndPosition());
+            selectStatement.setGroupByLastPosition(sqlParser.getLexer().getCurrentToken().getEndPosition() - getSqlParser().getLexer().getCurrentToken().getLiterals().length());
         } else if (sqlParser.skipIfEqual(DefaultKeyword.HAVING)) {
             throw new UnsupportedOperationException("Cannot support Having");
         }

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/rewrite/SQLRewriteEngine.java

@@ -90,7 +90,7 @@ public SQLBuilder rewrite(final boolean isRewriteLimit) {
             } else if (each instanceof OffsetToken) {
                 appendLimitOffsetToken(result, (OffsetToken) each, count, sqlTokens, isRewriteLimit);
             } else if (each instanceof OrderByToken) {
-                appendOrderByToken(result);
+                appendOrderByToken(result, count, sqlTokens);
             }
             count++;
         }
@@ -147,7 +147,7 @@ private void appendLimitOffsetToken(final SQLBuilder sqlBuilder, final OffsetTok
         sqlBuilder.appendLiterals(originalSQL.substring(beginPosition, endPosition));
     }
 
-    private void appendOrderByToken(final SQLBuilder sqlBuilder) {
+    private void appendOrderByToken(final SQLBuilder sqlBuilder, final int count, final List<SQLToken> sqlTokens) {
         SelectStatement selectStatement = (SelectStatement) sqlStatement;
         StringBuilder orderByLiterals = new StringBuilder(" ORDER BY ");
         int i = 0;
@@ -161,6 +161,9 @@ private void appendOrderByToken(final SQLBuilder sqlBuilder) {
         }
         orderByLiterals.append(" ");
         sqlBuilder.appendLiterals(orderByLiterals.toString());
+        int beginPosition = ((SelectStatement) sqlStatement).getGroupByLastPosition();
+        int endPosition = sqlTokens.size() - 1 == count ? originalSQL.length() : sqlTokens.get(count + 1).getBeginPosition();
+        sqlBuilder.appendLiterals(originalSQL.substring(beginPosition, endPosition));
     }
 
     /**

sharding-jdbc-core/src/test/resources/integrate/assert/select_group_by.xml

@@ -42,4 +42,10 @@
             <data parameter="1,9,1000,1909"/>
         </sharding-rule>
     </sql>
+    <sql id="assertSelectWithGroupByAndLimit">
+        <sharding-rule>
+            <data parameter="1" expected="select_group_by/SelectLimit.xml" />
+            <data parameter="0" />
+        </sharding-rule>
+    </sql>
 </sqls>

sharding-jdbc-core/src/test/resources/integrate/dataset/db/expect/select_group_by/SelectLimit.xml

@@ -0,0 +1,3 @@
+<dataset>
+    <t_order user_id="10" />
+</dataset>

sharding-jdbc-core/src/test/resources/integrate/dataset/dbtbl/expect/select_group_by/SelectLimit.xml

@@ -0,0 +1,3 @@
+<dataset>
+    <t_order user_id="10" />
+</dataset>

sharding-jdbc-core/src/test/resources/integrate/dataset/masterslave/expect/select_group_by/SelectLimit.xml

@@ -0,0 +1,3 @@
+<dataset>
+    <t_order user_id="10" />
+</dataset>

sharding-jdbc-core/src/test/resources/integrate/dataset/tbl/expect/select_group_by/SelectLimit.xml

@@ -0,0 +1,3 @@
+<dataset>
+    <t_order user_id="10" />
+</dataset>

sharding-jdbc-core/src/test/resources/sql/select_group_by.xml

@@ -8,4 +8,5 @@
     <sql id="assertSelectOrderByDescWithGroupBy" value="SELECT SUM(order_id) AS orders_sum, user_id FROM t_order GROUP BY user_id ORDER BY orders_sum DESC" />
     <sql id="assertSelectCountWithoutGroupedColumn" value="SELECT count(*) as items_count FROM t_order o JOIN t_order_item i ON o.user_id = i.user_id AND o.order_id = i.order_id WHERE o.user_id IN (%s, %s) AND o.order_id BETWEEN %s AND %s GROUP BY o.user_id" />
     <sql id="assertSelectCountWithGroupByBindingTable" value="SELECT count(*) as items_count, o.user_id FROM t_order o JOIN t_order_item i ON o.user_id = i.user_id AND o.order_id = i.order_id WHERE o.user_id IN (%s, %s) AND o.order_id BETWEEN %s AND %s GROUP BY o.user_id" />
+    <sql id="assertSelectWithGroupByAndLimit" value="SELECT user_id FROM t_order GROUP BY user_id LIMIT %s" type="H2,MySQL,PostgreSQL" />
 </sqls>