@TableLogic(value = "1",delval = "0")导致修改异常
时间: 2023-11-05 08:42:48 浏览: 30
@TableLogic注解是MyBatis-Plus提供的逻辑删除注解,用于标记是否删除的状态字段。其中,value属性表示逻辑存在的值,默认为1;delval属性表示逻辑删除的值,默认为0。
如果在使用@TableLogic注解时,将value属性设置为0,而delval属性设置为1,则会导致修改异常。这是因为,在进行逻辑删除时,MyBatis-Plus会将value属性的值与状态字段的值进行比较,如果相等则表示该记录存在,否则表示该记录已被删除。而在此情况下,value属性的值为0,而状态字段的值被修改为1,因此无法正常进行逻辑删除操作。
因此,在使用@TableLogic注解时,应确保value属性的值与状态字段的默认值相同,而delval属性的值与逻辑删除的值相同,否则可能会出现异常情况。
相关问题
@synthesize value = _value; 是什么意思
@synthesize value = _value; 是一种属性合成的语法,其中"value"是属性的名称,"_value"是属性的实例变量的名称。
在Objective-C中,属性一般会自动生成对应的实例变量,但是实例变量的命名可以使用不同的约定。使用@synthesize value = _value; 的语法可以将属性"value"与实例变量"_value"进行关联。
这种命名约定的好处是可以避免与属性名称相同的局部变量产生冲突。通过将实例变量命名为以"_"开头的形式,可以清晰地区分出属性和实例变量。
例如,假设有以下类定义:
```objective-c
// MyClass.h文件
@interface MyClass : NSObject
@property (nonatomic, strong) NSString *value;
@end
```
```objective-c
// MyClass.m文件
@implementation MyClass
@synthesize value = _value;
- (void)setValue:(NSString *)value {
_value = [value copy];
}
- (NSString *)value {
return _value;
}
@end
```
在上面的代码中,@synthesize value = _value; 将属性"value"与实例变量"_value"关联起来。在setter和getter方法中,我们直接访问的是"_value"实例变量。
这样做的好处是可以避免在setter和getter方法中使用属性本身的名称,减少命名冲突的可能性。
希望能够解答你的问题!如果你还有其他疑问,请继续提问。
把下面代码缺失字段补充完整 并对index进行排序 @ExcelProperty(value = "申告来源", index = 13) @ColumnWidth(20) private String @ExcelProperty(value = "申告时间", index = 14) @ColumnWidth(20) private String @ExcelProperty(value = "编号", index = 15) @ColumnWidth(20) private String @ExcelProperty(value = "新产品名称", index = 16) @ColumnWidth(20) private String @ExcelProperty(value = "故障发生时间", index = 17) @ColumnWidth(20) private String @ExcelProperty(value = "故障修复时间", index = 18) @ColumnWidth(20) private String @ExcelProperty(value = "业务分类", index = 19) @ColumnWidth(20) private String @ExcelProperty(value = "业务小类", index = 20) @ColumnWidth(20) private String @ExcelProperty(value = "派单省", index = 21) @ColumnWidth(20) private String @ExcelProperty(value = "派单人", index = 22) @ColumnWidth(20) private String @ExcelProperty(value = "派单时间", index = 23) @ColumnWidth(20) private String @ExcelProperty(value = "派单用时", index = 24) @ColumnWidth(20) private String @ExcelProperty(value = "确认时间", index = 25) @ColumnWidth(20) private String @ExcelProperty(value = "确认用时", index = 26) @ColumnWidth(20) private String @ExcelProperty(value = "处理省", index = 27) @ColumnWidth(20) private String @ExcelProperty(value = "处理省市", index = 28) @ColumnWidth(20) private String @ExcelProperty(value = "收单用时", index = 29) @ColumnWidth(20) private String @ExcelProperty(value = "故障原因", index = 30) @ColumnWidth(20) private String @ExcelProperty(value = "故障级别", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "故障类型", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "故障子类型", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "业务不可用时长", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "故障历时", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "免责时长", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "客户确认业务恢复时间", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "FAULT_PROV", index = 0) @ColumnWidth(20) private String @ExcelProperty(value = "项目名称", index = 0) @ColumnWidth(20) priva
由于缺失字段的类型和默认值未知,因此以下代码中只是简单地补充了缺失字段,并对 index 进行了排序:
```
@ExcelProperty(value = "故障级别", index = 0) @ColumnWidth(20) private String faultLevel = "";
@ExcelProperty(value = "故障类型", index = 0) @ColumnWidth(20) private String faultType = "";
@ExcelProperty(value = "故障子类型", index = 0) @ColumnWidth(20) private String faultSubType = "";
@ExcelProperty(value = "业务不可用时长", index = 0) @ColumnWidth(20) private String unavailableDuration = "";
@ExcelProperty(value = "故障历时", index = 0) @ColumnWidth(20) private String faultDuration = "";
@ExcelProperty(value = "免责时长", index = 0) @ColumnWidth(20) private String exemptionDuration = "";
@ExcelProperty(value = "客户确认业务恢复时间", index = 0) @ColumnWidth(20) private String recoverTime = "";
@ExcelProperty(value = "FAULT_PROV", index = 0) @ColumnWidth(20) private String faultProv = "";
@ExcelProperty(value = "项目名称", index = 0) @ColumnWidth(20) private String projectName = "";
@ExcelProperty(value = "申告来源", index = 13) @ColumnWidth(20) private String declareSource = "";
@ExcelProperty(value = "申告时间", index = 14) @ColumnWidth(20) private String declareTime = "";
@ExcelProperty(value = "编号", index = 15) @ColumnWidth(20) private String number = "";
@ExcelProperty(value = "新产品名称", index = 16) @ColumnWidth(20) private String newProductName = "";
@ExcelProperty(value = "故障发生时间", index = 17) @ColumnWidth(20) private String faultStartTime = "";
@ExcelProperty(value = "故障修复时间", index = 18) @ColumnWidth(20) private String faultEndTime = "";
@ExcelProperty(value = "业务分类", index = 19) @ColumnWidth(20) private String businessCategory = "";
@ExcelProperty(value = "业务小类", index = 20) @ColumnWidth(20) private String businessSubCategory = "";
@ExcelProperty(value = "派单省", index = 21) @ColumnWidth(20) private String dispatchProvince = "";
@ExcelProperty(value = "派单人", index = 22) @ColumnWidth(20) private String dispatcher = "";
@ExcelProperty(value = "派单时间", index = 23) @ColumnWidth(20) private String dispatchTime = "";
@ExcelProperty(value = "派单用时", index = 24) @ColumnWidth(20) private String dispatchDuration = "";
@ExcelProperty(value = "确认时间", index = 25) @ColumnWidth(20) private String confirmTime = "";
@ExcelProperty(value = "确认用时", index = 26) @ColumnWidth(20) private String confirmDuration = "";
@ExcelProperty(value = "处理省", index = 27) @ColumnWidth(20) private String processProvince = "";
@ExcelProperty(value = "处理省市", index = 28) @ColumnWidth(20) private String processCity = "";
@ExcelProperty(value = "收单用时", index = 29) @ColumnWidth(20) private String receiptDuration = "";
@ExcelProperty(value = "故障原因", index = 30) @ColumnWidth(20) private String faultReason = "";
// 对 index 进行排序
List<Field> fields = Arrays.asList(this.getClass().getDeclaredFields());
fields.sort(Comparator.comparingInt(f -> f.getAnnotation(ExcelProperty.class).index()));
```
请注意,补充字段的类型和默认值需要根据实际情况进行调整。