新增H2分页插件(和mysql一致)

hsweb-web-dao-impl-mybatis/src/main/java/org/hsweb/web/mybatis/plgins/pager/dialect/H2PagerHelper.java

@@ -0,0 +1,40 @@
+package org.hsweb.web.mybatis.plgins.pager.dialect;
+
+import org.hsweb.web.bean.common.QueryParam;
+import org.hsweb.web.mybatis.plgins.pager.PagerHelper;
+import org.springframework.stereotype.Component;
+import org.webbuilder.utils.common.StringUtils;
+
+/**
+ * Created by zhouhao on 16-4-13.
+ */
+@Component
+public class H2PagerHelper implements PagerHelper {
+    @Override
+    public String doPaging(QueryParam param, String sql) {
+        StringBuilder builder = new StringBuilder();
+        builder.append(buildSortSql(param, sql)); //sql格式化
+        if (param.isPaging())
+            builder.append(" limit ")
+                    .append(param.getPageSize() * param.getPageIndex())
+                    .append(",")
+                    .append(param.getPageSize() * (param.getPageIndex() + 1));
+        return builder.toString();
+    }
+
+    protected String buildSortSql(QueryParam param, String sql) {
+        StringBuilder builder = new StringBuilder(sql);
+        if (!StringUtils.isNullOrEmpty(param.getSortField())) {
+            builder.append(" order by ").append(param.getSortField());
+            if (!StringUtils.isNullOrEmpty(param.getSortOrder())) {
+                builder.append(" ").append(param.getSortOrder());
+            }
+        }
+        return builder.toString();
+    }
+
+    @Override
+    public String getDialect() {
+        return "h2";
+    }
+}