Microsoft sql blob data type

It is basically a binary string of variable length, stored as a sequence of bytes or octets. BLOB data type is generally used to store large files such as images, media files such as video and audio clips in the database. We can write a BLOB value to the database as binary or character string depending on the file or requirement. The only difference being usage of BLOB data type instead of any other data type. We have successfully inserted two records in the table.

This function is basically used to convert values to raw data type. Here, we have used postgreSQL for illustration. Next, let us insert a few records in the table. Table columns and Transact-SQL variables can specify varchar max , nvarchar max , or varbinary max data types.

The primary scenarios for working with large-value types involve retrieving them from a database, or adding them to a database. The following sections describe different approaches to accomplish these tasks. When you retrieve a non-binary large-value data type-such as the varchar max data type-from a database, one approach is to read that data as a character stream. In the following example, the executeQuery method of the SQLServerStatement class is used to retrieve data from the database and return it as a result set.

This same approach can also be used for the text , ntext , and nvarchar max data types. When you retrieve a binary large-value data type-such as the varbinary max data type-from a database, there are several approaches that you can take. The most efficient approach is to read the data as a binary stream, as in the following:. You can also use the getBytes method to read the data as a byte array, as in the following:.

You can also read the data as a BLOB. However, this is less efficient than the two methods shown previously. Uploading large data with the JDBC driver works well for the memory-sized cases, and in the larger-than-memory cases, streaming is the primary option.

However, the most efficient way to upload large data is through the stream interfaces. This approach can also be used for values that are stored in text , ntext , and nvarchar max columns.

If you have an image library on the server and must upload entire binary image files to a varbinary max column, the most efficient method with the JDBC driver is to use streams directly, as in the following:.

If you have to replace the instance of a word in a large text file, such as an archived HTML file, you can use a Clob object, as in the following:. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No.

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