DbColumnInfo 类 |  |
This class describes extended information for a field in a workarea, for fields that come from a SQL backend.
继承层次命名空间： XSharp.RDD
程序集： XSharp.Core (在 XSharp.Core.dll 中) 版本：2.22 GA
语法DbColumnInfo 类型公开以下成员。
构造函数| 名称 | 说明 | |
|---|---|---|
 | DbColumnInfo(RddFieldInfo) | Initializes a new instance of the DbColumnInfo class |
| DbColumnInfo(String, String, Int32, Int32, Int32) | Initializes a new instance of the DbColumnInfo class |
属性| 名称 | 说明 | |
|---|---|---|
 | CanSort | Can the field be sorted? (继承自 RddFieldInfo。) |
| Caption | Dynamic property for the Caption. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| ColumnName | Dynamic property for the ColumnName. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| DefaultValue | Dynamic property for the DefaultValue. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| Description | Dynamic property for the Description. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| DotNetType | DotNet datatype of the column |
| FieldTypeFlags | FieldType as a string (继承自 RddFieldInfo。) |
| FieldTypeStr | Field type as 1 character string. (继承自 RddFieldInfo。) |
| Format | Dynamic property for the Format. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| HasProperties | Does the field have properties. (继承自 RddFieldInfo。) |
| InputMask | Dynamic property for the InputMask. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| IsAutoIncrement | Is it an autoincrement ? (继承自 RddFieldInfo。) |
| IsBinary | Is it binary ? (继承自 RddFieldInfo。) |
| IsCompressed | Is it a compressed field (not implemented yet) ? (继承自 RddFieldInfo。) |
| IsEncrypted | Is it an encryped field (not implemented yet)? (继承自 RddFieldInfo。) |
| IsMemo | Is it a memo ? (继承自 RddFieldInfo。) |
| IsNullable | Is it nullable ? (继承自 RddFieldInfo。) |
| IsStandard | Is it a standard Dbase 3 field (CDLMN) ? (继承自 RddFieldInfo。) |
| IsUnicode | Is it a unicode text ? (继承自 RddFieldInfo。) |
| IsUnique | Dynamic property for the IsUnique. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| IsVarLength | Is it a variable length field ? (继承自 RddFieldInfo。) |
| IsVfp | Is it a VFP extended field ? (继承自 RddFieldInfo。) |
| NumericPrecision | Numeric Precision |
| NumericScale | Numeric Scale |
| PrimaryKey | Dynamic property for the PrimaryKey. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| Properties | Dynamic list of optional properties, such as Caption, Description. (继承自 RddFieldInfo。) |
| ReadOnly | Numeric Precision |
| RuleExpression | Dynamic property for the RuleExpression. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
| RuleText | Dynamic property for the RuleText. Read from the VFP properties collection. (继承自 RddFieldInfo。) |
方法| 名称 | 说明 | |
|---|---|---|
| BlankValue | Return the blank (non null) value of the column. (继承自 RddFieldInfo。) |
| CalculateColumnType | Calculate the column type from the FieldType |
| Clone | Clone a RddFieldInfo object. (继承自 RddFieldInfo。) |
| CopyValues | Copy values from one object to another. (继承自 RddFieldInfo。) |
| SameType | Check if two fields match in type, length and decimals. (继承自 RddFieldInfo。) |
| ToString | (继承自 RddFieldInfo。) |
| Validate | Validate combinations of type, length and decimals. (继承自 RddFieldInfo。) |
字段| 名称 | 说明 | |
|---|---|---|
 | Alias | Alternative name, no length limit. This is the Caption for VFP fields (继承自 RddFieldInfo。) |
| Decimals | Decimal positions (继承自 RddFieldInfo。) |
| FieldType | Field Type (继承自 RddFieldInfo。) |
| Flags | Flags, such as Nullable, AutoIncrement, Binary etc. (继承自 RddFieldInfo。) |
| Length | Physical length in the table (继承自 RddFieldInfo。) |
| Name | Name, normally max 10 characters (继承自 RddFieldInfo。) |
| NextValue | Next key for autoincrement columns. (继承自 RddFieldInfo。) |
| Offset | Offset in the record buffer for DBF fields. (继承自 RddFieldInfo。) |
| Ordinal | 1 based Ordinal position in the RDD. (继承自 RddFieldInfo。) |
| StepValue | Step value for autoincrement columns. (继承自 RddFieldInfo。) |
参见