添加emptyparam函数，用于判断给定参数名对应的外部参数是否存在，用来简单SQL中对参数的判断

ureport2-core/src/main/java/com/bstek/ureport/expression/function/ParameterIsEmptyFunction.java

@@ -0,0 +1,27 @@
+package com.bstek.ureport.expression.function;
+
+import java.util.List;
+
+import com.bstek.ureport.build.Context;
+import com.bstek.ureport.expression.model.data.ExpressionData;
+import com.bstek.ureport.model.Cell;
+
+/**
+ * @author Jacky.gao
+ * @since 2017年12月7日
+ */
+public class ParameterIsEmptyFunction extends ParameterFunction{
+	@Override
+	public Object execute(List<ExpressionData<?>> dataList, Context context,
+			Cell currentCell) {
+		Object obj = super.execute(dataList, context, currentCell);
+		if(obj==null || obj.toString().trim().equals("")){
+			return true;
+		}
+		return false;
+	}
+	@Override
+	public String name() {
+		return "emptyparam";
+	}
+}

ureport2-core/src/main/resources/ureport-core-context.xml

@@ -111,6 +111,7 @@
 	<bean id="ureport.pageSumFunction" class="com.bstek.ureport.expression.function.page.PageSumFunction"></bean>
 	
 	<bean id="ureport.parameterFunction" class="com.bstek.ureport.expression.function.ParameterFunction"></bean>
+	<bean id="ureport.parameterIsEmptyFunction" class="com.bstek.ureport.expression.function.ParameterIsEmptyFunction"></bean>
 	<bean id="ureport.jsonFunction" class="com.bstek.ureport.expression.function.JsonFunction"></bean>
 	
 	<bean id="ureport.rowFunction" class="com.bstek.ureport.expression.function.RowFunction"></bean>

ureport2-core/src/main/resources/ureport.properties

@@ -1,3 +1,4 @@
 ureport.disableHttpSessionReportCache=false
 ureport.disableFileProvider=false
-ureport.fileStoreDir=/WEB-INF/ureportfiles
+ureport.fileStoreDir=/WEB-INF/ureportfiles
+urule.consoleLoggerLevel=INFO