将数据批量导出到要在其他程序中使用的文本文件时,或从其他程序生成的文本文件批量导入数据时,建议使用字符格式。 采用字符格式后,所有列均应用字符数据格式。 如果要将数据用于其他程序(如电子表格程序),或需要通过其他数据库供应商(如 Oracle)将数据复制到 SQL Server 实例中,则以字符格式存储信...
LIKE 子句中的 pattern 和 escape_character 引數。 CONVERT 子句的 style 參數。 IDENTITY 子句中的整數常數。 使用ODBC 延伸語法指定的常數。 可摺疊常數的運算式,其為 +、-、*、/ 和% 運算子的引數。 考量是否可進行強制參數化時,若符合下列其中一項條件,SQL Server 就會認定運算式為可摺疊常數的: 運算式...
FIRST RECURSIVE XMLFOREST FLOAT REF XMLITERATE FOUND REFERENCING XMLNAMESPACES FREE REGR_AVGX XMLPARSE FULLTEXTTABLE REGR_AVGY XMLPI FUSION REGR_COUNT XMLQUERY GENERAL REGR_INTERCEPT XMLSERIALIZE GET REGR_R2 XMLTABLE GLOBAL REGR_SLOPE XMLTEXT ...
When you create or alter a table, you can specify collations for each character-string column by using the COLLATE clause. If you don't specify a collation, the column is assigned the default collation of the database. You can change the collation of a column by using an ALTER TABLE stat...
CONSTRAINT rule of no special characters allowed? Help consumed workload has syntax errors contains more than the maximum number of prefixes. The maximum is 2 continue executing sql statements despite errors Conversion failed when converting character string to smalldatetime data type Conversion failed wh...
An implicit conversion occurs when another character data type is used as input. Large string data types nvarchar(max) and varchar(max) cannot be used. In the following example, the @SearchWord variable, which is defined as varchar(30), causes an implicit conversion in the CONTAINS predicate....
Character string (not "Y" or "N") Empty string SQLUSMALLINT 0 SQLUINTEGER bitmask or SQLUINTEGER binary value 0L For example, if a data source does not support procedures, SQLGetInfo returns the values listed in the following table for the values of InfoType that are related to procedures...
Execute a character string: EXEC [ UTE ] ( { @string_variable | [ N ] 'tsql_string' } [ + ...n ] ) [;] Execute a pass-through command against a linked server EXEC [ UTE ] ( { @string_variable | [ N ] 'command_string' } [ + ...n ] [ {, { value | @variable...
如果StringLengthPtr 指向的位置中的值大于 BufferLength 中指定的长度,则字符串输出信息将被截断为 BufferLength 字节,函数返回 SQL_SUCCESS_WITH_INFO。 用法 请参SQLGetInfo( 返回的信息, InfoType可能值列表,以及 SQLGetInfo() 函数针对该值返回的信息描述。 返回码 SQL_SUCCESS SQL_SUCCESS_WITH_INFO SQL_ERRO...
import ( // 00.引入数据库驱动 "gitee.com/chunanyong/dm" "io" ) // CustomDMText 实现ICustomDriverValueConver接口,扩展自定义类型,例如 达梦数据库TEXT类型,映射出来的是dm.DmClob类型,无法使用string类型直接接收 type CustomDMText struct{} // GetDriverValue 根据数据库列类型,返回driver.Value的实例...