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This article mainly introduces "how to solve the problem that the parameter data type text of MSSQL is invalid for parameter 1 of replace function". In daily operation, it is believed that many people have doubts about how to solve the problem that the parameter data type of MSSQL is invalid for parameter 1 of replace function. The editor consulted all kinds of materials and sorted out simple and useful operation methods. Hope to answer the "MSSQL error parameter data type text for the replace function parameter 1 invalid how to solve" the doubt is helpful! Next, please follow the editor to study!

String manipulation cannot be performed on data of type text or ntext in a query. What is most used at this time is to treat text as varchar (when the actual content length is less than 8000 bytes) or ntext as nvarchar (when the actual content length is less than 4000 bytes). But this is not very appropriate, after all, if the content of the text field exceeds 8000, it will be truncated or ignored. Finally, a method is found to solve the problem that the parameter data type text is not valid for parameter 1 of the replace function. Let's use an example to illustrate how to deal with it. The syntax is as follows: the copy code is as follows: update table set column=replace (cast (column as varchar (max)), '123 records and ABC')

Explanation: where table represents the table name, and column codes the columns in the table that need to be replaced. The function of the change statement is to replace all the 123s in the column column of the table table with abc. Annex: introduction of max types Microsoft SQL Server 2005 introduces the max specifier. This specifier enhances the storage capacity of varchar, nvarchar, and varbinary data types. Varchar (max), nvarchar (max), and varbinary (max) are collectively referred to as large data types. You can use large data types to store up to 2 ^ 31-1 bytes of data. Note: when the 'large value types out of row' option of the sp_tableoption stored procedure is set to OFF, the inline storage for large value types is limited to 8000 bytes. When this option is set to ON, only 16-byte roots are stored in the line. For more information, see sp_tableoption (Transact-SQL). Large data types behave similarly to their smaller counterparts, varchar, nvarchar, and varbinary. This similarity enables SQL Server to store and retrieve large characters, Unicode, and binary data more efficiently. With large-value data types, it is not possible to use SQL Server in a way that would not have been possible with the text, ntext, and image data types in earlier versions of SQL Server. For example, in SQL Server 2005, you can define variables that can store large amounts of data (up to 2 ^ 31 bytes of characters, integers, and Unicode data). For more information, see Transact-SQL variables. The following table describes the relationship between large data types and their corresponding data types in previous versions of SQL Server.

Varchar (max) text*nvarchar (max) ntext*varbinary (max)

Image

LOB in earlier versions of large data types

* the client of SQL Server version 6.5 does not support the ntext data type, so nvarchar (max) is not recognized.

Important: use varchar (max), nvarchar (max), and varbinary (max) data types instead of text, ntext, and image data types. Large data types behave the same as their smaller data types varchar (n), nvarchar (n), and varbinary (n). The following describes the use of large data types in some specific situations: cursors can assign data from the column of large data types returned by FETCH to local variables because they can define large data type variables. For more information, see FETCH (Transact-SQL). The use of large data types does not affect the forced cursor conversion usage of cursors. The chunked update UPDATE statement now supports the .WRITE () clause to partially update the underlying large data column. This is similar to the text pointer operations, WRITETEXT, and UPDATETEX for text, ntext, and image data types supported in earlier versions of SQL Server. For more information, see UPDATE (Transact-SQL). Triggers support the use of AFTER triggers on column references of large data types in inserted and deleted tables. For more information, see CREATE TRIGGER (Transact-SQL). The string function built-in for operable characters and binary data has been enhanced to support parameters of large data types. These functions include: copy the code as follows: COL_LENGTHCHARINDEXPATINDEXLENDATALENGTHSUBSTRING

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