fix #176 ResultSet's state of wasNull mismatch the actual situation

Author: hanahmily

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/merger/resultset/memory/AbstractMemoryResultSet.java

@@ -102,9 +102,7 @@ public Object getObject(final int columnIndex) throws SQLException {
         Preconditions.checkState(null != currentRow, "After end of result set");
         Preconditions.checkArgument(currentRow.inRange(columnIndex), String.format("Column Index %d out of range", columnIndex));
         Object result = currentRow.getCell(columnIndex);
-        if (null == result) {
-            wasNull = true;
-        }
+        wasNull = null == result;
         return result;
     }
 
@@ -127,7 +125,6 @@ public String getString(final String columnLabel) throws SQLException {
     public boolean getBoolean(final int columnIndex) throws SQLException {
         Object cell = getObject(columnIndex);
         if (null == cell) {
-            wasNull = true;
             return false;
         }
         return (cell instanceof Boolean) ? (Boolean) cell : Boolean.valueOf(cell.toString());
@@ -223,7 +220,6 @@ public BigDecimal getBigDecimal(final String columnLabel) throws SQLException {
     public byte[] getBytes(final int columnIndex) throws SQLException {
         String value = getString(columnIndex);
         if (null == value) {
-            wasNull = true;
             return null;
         }
         return value.getBytes();
@@ -299,7 +295,6 @@ public Timestamp getTimestamp(final String columnLabel, final Calendar cal) thro
     public URL getURL(final int columnIndex) throws SQLException {
         String value = getString(columnIndex);
         if (null == value) {
-            wasNull = true;
             return null;
         }
         try {

sharding-jdbc-doc/content/post/release_notes.md

@@ -1,7 +1,3 @@
-
-
-
-
 +++
 date = "2016-02-05T17:03:18+08:00"
 title = "Release Notes"
@@ -19,12 +15,12 @@ weight = 1
    [ISSUE #163](https://github.com/dangdangdotcom/sharding-jdbc/issues/163)
    [ISSUE #171](https://github.com/dangdangdotcom/sharding-jdbc/issues/171)
    [ISSUE #172](https://github.com/dangdangdotcom/sharding-jdbc/issues/172)
-
-## 1.3.3
-
+   
 ### 缺陷修正
+   
+1. [ISSUE #176](https://github.com/dangdangdotcom/sharding-jdbc/issues/176) AbstractMemoryResultSet对SQL的wasNull实现有问题
 
-1. [ISSUE #166](https://github.com/dangdangdotcom/sharding-jdbc/issues/166) druid数据源stat过滤器多线程报错
+## 1.3.3
 
 ### 功能提升
 
@@ -37,6 +33,7 @@ weight = 1
 1. [ISSUE #122](https://github.com/dangdangdotcom/sharding-jdbc/issues/122) bed的fail重试问题
 1. [ISSUE #152](https://github.com/dangdangdotcom/sharding-jdbc/issues/152) 可能同一个connection多线程导致问题
 1. [ISSUE #150](https://github.com/dangdangdotcom/sharding-jdbc/issues/150) 与最新SQLserver jdbc驱动兼容问题
+1. [ISSUE #166](https://github.com/dangdangdotcom/sharding-jdbc/issues/166) druid数据源stat过滤器多线程报错
 
 ## 1.3.2