新：新增条件组，用于处理复杂的where条件

hutool-db/src/test/java/cn/hutool/db/sql/ConditionGroupTest.java

@@ -0,0 +1,26 @@
+package cn.hutool.db.sql;
+
+import org.junit.Test;
+
+public class ConditionGroupTest {
+	@Test
+	public void ConditionGroupToStringTest() {
+		Condition condition1 = new Condition("a", "A");
+		Condition condition2 = new Condition("b", "B");
+		condition2.setLinkOperator(LogicalOperator.OR);
+		Condition condition3 = new Condition("c", "C");
+		Condition condition4 = new Condition("d", "D");
+
+		ConditionGroup cg = new ConditionGroup();
+		cg.addConditions(condition1, condition2);
+
+		// 条件组嵌套情况
+		ConditionGroup cg2 = new ConditionGroup();
+		cg2.addConditions(cg, condition3);
+
+		final ConditionBuilder conditionBuilder = ConditionBuilder.of(cg2, condition4);
+
+		System.out.println(conditionBuilder.build());
+		System.out.println(conditionBuilder.getParamValues());
+	}
+}