1、简单多条件多动参数
创建数据库对象
//创建数据库对象 SqlSugarClient SqlSugarClient db = new SqlSugarClient(new ConnectionConfig() { ConnectionString = "Server=.xxxxx",//连接符字串 DbType = DbType.SqlServer, //数据库类型 IsAutoCloseConnection = true //不设成true要手动close });
前台传的JSON格式 [{},{},{}]
[ {"FieldName":"id","ConditionalType":"0","FieldValue":"1"}, {"FieldName":"name","ConditionalType":"0","FieldValue":"jack"} ]
后台代码
//手动构造 var conModels = new List<IConditionalModel>(); conModels.Add(new ConditionalModel{ FieldName = "id",ConditionalType=ConditionalType.Equal,FieldValue="1"}); conModels.Add(new ConditionalModel{ FieldName = "name",ConditionalType=ConditionalType.Equal,FieldValue="jack"}); //5.0.5.1 Json直接序列化 var conModels= db.Context.Utilities.JsonToConditionalModels(json) var student = db.Queryable<Student>().Where(conModels).ToList(); //select * from Student where id=1 and name = 'jack'
这种比较简单 多一条记录就多一个AND
2、二级多条件动态参数
这种模式对于表格查询已经够用了,支持到2级查询,并且AND OR都比较灵活了
[ {"FieldName": "id","FieldValue": "1","ConditionalType": 10}, {"FieldName": "id","FieldValue": null,"ConditionalType": 12}, { "ConditionalList": [{ "Key": 1, "Value": { "FieldName": "id", "FieldValue": "2", "ConditionalType": 0 } }, { "Key": 0, "Value": { "FieldName": "id", "FieldValue": "2", "ConditionalType": 0 } }] }] //5.0.5.1 Json直接序列化 var whereList= db.Context.Utilities.JsonToConditionalModels(json); var list = db.Queryable<Order>().Where(whereList).ToList();
生成的Sql:
WHERE [id] <> @Conditid0 AND [id] IS NOT NULL OR ( [id] = @Conditid10000 AND [id] = @Conditid20000 )
说明:ConditionalList 第一个Key为1 那么就会生成 Or( 条件 )
ConditionalList 第一个Key为0 那么就会生成 And( 条件 )
Key表式运算符: And =0, Or=1
例子1:ConditionalList 集合中 有3条记录 key =1 , key =0 ,key=1
生成的Sql OR(条件 AND 条件 OR条件)
例子2:ConditionalList 集合中 有1条记录 key =1
生成的Sql OR(条件)
例子3:ConditionalList 集合中 有4条记录 key =0,key=1,key=1,key=1
生成的Sql AND (条件 OR 条件 OR条件 OR 条件)
这种模式只支持2级操作,需要更多层级就实现不了了
3、树型动态条件 (请升级5.0.5.1)
这种就比较强大了,一般用于表的公开API等操作,可以构造任何层级的条件 ,可以支持树型条件
Key表式运算符: And =0, Or=1, null=-1
[{ "ConditionalList": [{ "Key": -1, "Value": { "FieldName": "id", "FieldValue": "2", "ConditionalType": 0 } }, { "Key": 0, "Value": { "FieldName": "name", "FieldValue": "2", "ConditionalType": 0 } }, { "Key": 0, "Value": { "ConditionalList": [{ "Key": -1, "Value": { "FieldName": "price", "FieldValue": "1", "ConditionalType": 0 } }, { "Key": 0, "Value": { "FieldName": "CustomId", "FieldValue": "1", "ConditionalType": 0 } }] } }] }]
生成的SQL:
WHERE ( [id] = @Conditid10001 AND [name] = @Conditname20001 AND( [price] = @Conditprice10000 AND [CustomId] = @ConditCustomId20000 ) )
C#代码
var conditionalModels = db.Context.Utilities.JsonToConditionalModels(json); var list = db.Queryable<Order>().Where(conditionalModels).ToList();
更多用例:https://www.donet5.com/Ask/9/14378
3、操作符解释
ConditionalTypek是一个枚举
枚举 | 枚举值 | 描述 |
---|---|---|
Equal | 0 | 等于 |
Like | 1 | 模糊查询 |
GreaterThan | 2 | 大于 |
GreaterThanOrEqual | 3 | 大于等于 |
LessThan | 4 | 小于 |
LessThanOrEqual | 5 | 小于等于 |
In | 6 |
In操作 正确格式 X,Y,Z 错误格式 'X','Y','z' |
NotIn | 7 | Not in操作 参数和in一样 |
LikeLeft | 8 | 左模糊 |
LikeRight | 9 | 右模糊 |
NoEqual | 10 | 不等于 |
IsNullOrEmpty | 11 | 是null或者'' |
IsNot | 12 |
情况1 value不等于null 字段<> x 情况2 value等于null 字段 is not null |
NoLike | 13 | 模糊查询取反 |
EqualNull | 14 |
情况1 value不等于null 字段= x 情况2 value等于null 字段 is null
|
InLike | 15 |
正确格式 X,Y,Z 错误格式 'X','Y','z' 生在的Sql : ( id like '%X%' or id like '%Y%' or id like '%Z%') |
4、列名验证或者转换
需求1:实体和表中字段名称不一样的情况下,我们可以做下面转换
foreach(var r in conModels) { r.FieldName =db.EntityMaintenance.GetDbColumnName<Order>(r.FieldName );//这样就支持了用实体类中的属性作为参数 }
看文档:需求2:我要验证前端传过来的属性名和实体一样,列名虽然防注入,但是还是可以任意传,对于高安全级别项目加个验证更保险
https://www.donet5.com/Home/Doc?typeId=1202
5、类型转换
比如PGSQL不支持字符串参数与INT类型相等,我们可以使用类型转换
//SqlSugar自带的类型转换 new ConditionalModel() { FieldName = "id", ConditionalType = ConditionalType.Equal, FieldValue = "1", FieldValueConvertFunc=it=>SqlSugar.UtilMethods.ChangeType2(it,typeof(int)) } //自个实现类型转换 new ConditionalModel() { FieldName = "id", ConditionalType = ConditionalType.Equal, FieldValue = "1", FieldValueConvertFunc=it=>Convert.ToInt32(it)) }
6、多表查询去别名
List<IConditionalModel> conModels = new List<IConditionalModel>(); conModels.Add(new ConditionalModel{ FieldName = "id", ConditionalType = ConditionalType.Equal,FieldValue="1"}); var oneClass = db.Queryable<Order, OrderItem, Custom>((o, i, c) => new JoinQueryInfos( JoinType.Left, o.Id == i.OrderId, JoinType.Left, o.CustomId == c.Id )) .Select((o,i,c)=> new ViewOrder// 是一个新类 { Id=o.Id CustomName=c.Name }) .MergeTable()//通过MergeTable处理下面的查询就不需要加上 (o,i,c) 的别名限制了 .Where(conModels) //因为Select通过Mergetable变成了一个新表,也就是说新表只有 id和CustomName .ToList();
安装: Nuget SqlSugarCore
源码: https://github.com/donet5/SqlSugar