promotion：实现部分优惠劵模板的前端逻辑

yudao-framework/yudao-spring-boot-starter-mybatis/src/main/java/cn/iocoder/yudao/framework/mybatis/core/type/LongListTypeHandler.java

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+package cn.iocoder.yudao.framework.mybatis.core.type;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.iocoder.yudao.framework.common.util.string.StrUtils;
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedJdbcTypes;
+import org.apache.ibatis.type.MappedTypes;
+import org.apache.ibatis.type.TypeHandler;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+/**
+ * List<Long> 的类型转换器实现类，对应数据库的 varchar 类型
+ *
+ * @author 芋道源码
+ */
+@MappedJdbcTypes(JdbcType.VARCHAR)
+@MappedTypes(List.class)
+public class LongListTypeHandler implements TypeHandler<List<Long>> {
+
+    private static final String COMMA = ",";
+
+    @Override
+    public void setParameter(PreparedStatement ps, int i, List<Long> strings, JdbcType jdbcType) throws SQLException {
+        // 设置占位符
+        ps.setString(i, CollUtil.join(strings, COMMA));
+    }
+
+    @Override
+    public List<Long> getResult(ResultSet rs, String columnName) throws SQLException {
+        String value = rs.getString(columnName);
+        return getResult(value);
+    }
+
+    @Override
+    public List<Long> getResult(ResultSet rs, int columnIndex) throws SQLException {
+        String value = rs.getString(columnIndex);
+        return getResult(value);
+    }
+
+    @Override
+    public List<Long> getResult(CallableStatement cs, int columnIndex) throws SQLException {
+        String value = cs.getString(columnIndex);
+        return getResult(value);
+    }
+
+    private List<Long> getResult(String value) {
+        if (value == null) {
+            return null;
+        }
+        return StrUtils.splitToLong(value, COMMA);
+    }
+}