Home Database Mysql Tutorial What is the Lob data type? What are the limitations of these data types in JDBC?

What is the Lob data type? What are the limitations of these data types in JDBC?

Aug 29, 2023 pm 05:29 PM

什么是 Lob 数据类型? JDBC 中这些数据类型有哪些限制?

BLOB are binary large objects that can hold variable amounts of data with a maximum length of 65535 characters

They are used to store large amounts of binary Data, such as images or other types of files.

CLOB Typically standing for Character Large Object, SQL Clob is a built-in data type used to store large amounts of text data. Using this data type, you can store up to 2,147,483,647 characters of data.

The Blob and Clob data types together are called LOB (large object) data types. The following are restrictions on these data types.

  • Cannot compare: We cannot compare CLOB or BLOB data types, i.e. you cannot combine these data types with operators =, !=.

  • Unsortable: You cannot arrange BLOB or CLOB data types in order, that is, you cannot determine which of the two data types is larger or smaller BLOB or CLOB data type. In short, you cannot use , >= with BLOB or CLOB types.

  • These cannot be used as primary key or index values

  • Subjects such as DISTINCT, GROUP BY and ORDER BY are not allowed on BLOB or CLOB data types sentence.

  • Implicit conversion of BLOB or CLOB to other data types is not possible.

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