MySQL Data Types (Version 8.0) In MySQL there are three main data types: string, numeric, and date and time. String Data Types Data typeDescription CHAR(size)A FIXED length string (can contain letters, numbers, and special characters). Thesizeparameter specifies the column length in characters...
String Data Types Data TypeDescription CHAR(x)can store characters of fixed length (max8000characters) VARCHAR(x)can store characters up to given length (max8000characters) BINARY(x)can store binary strings of fixed length VARBINARY(x)can store binary strings up to given length ...
Structured types 仅在用户定义函数中暴露 字符串类型 CHAR CHAR是一个定长字符字符串的数据类型。 声明方式: SQL: CHAR Java/Scala: Python: 可以使用CHAR(n)声明该类型,其中n是代码点的数量。n必须介于1和2,147,483,647之间(包括两者)。如果未指定长度,则n等于1。 VARCHAR / STRING VARCHAR / STRING是可变...
TheCHARdata type has one predefined subtype in both PL/SQL and SQL—CHARACTER. TheVARCHAR2data type has one predefined subtype in both PL/SQL and SQL,VARCHAR, and an additional predefined subtype in PL/SQL,STRING. Each subtype has the same range of values as its base type. ...
Source: SQLString.cs 表示要存储在数据库中或从数据库中检索的字符的可变长度流。 SqlString 具有与其相应的 .NET String 数据类型不同的基础数据结构。C# 复制 public struct SqlString : IComparable, IEquatable<System.Data.SqlTypes.SqlString>, System.Data.SqlTypes.INullable, System.Xm...
XML Types Collection Types Character String Types: A character string data type is described by a character string data type descriptor. SQL: Fixed-length character string : SQL : Character strings of Varying length Example : A table with columns of fixed and varying length size strings and a ...
SQL Server provides a number of data types that support all types of data that you may want to store. As you may have guessed, data type is an attribute that specifies the type of data that a column can store. It can be an integer, character string, monetary, date and time, and so...
將這個SqlString結構轉換為SqlDateTime。 C# publicSystem.Data.SqlTypes.SqlDateTimeToSqlDateTime(); 傳回 SqlDateTime 新的SqlDateTime結構,含有這個SqlString所表示的日期值。 適用於 產品版本 .NETCore 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 ...
ASqlDataTypeobject value that specifies the SQL Server data type. type AStringvalue that specifies the type of data type. schema AStringvalue that specifies the schema of the data type. 备注 仅Microsoft .NET Framework 的 2.0 版本支持此命名空间、类或成员。
publicstaticexplicitoperatorstring(System.Data.SqlTypes.SqlString x); Parameters x SqlString TheSqlStringto be converted. Returns String AString, whose contents are the same as theValueproperty of theSqlStringparameter. See also SQL Server Data Types and ADO.NET ...