问题
I am using Java JDBC with MySQL and I get this error:
com.mysql.jdbc.MysqlDataTruncation: Data truncation:
Data too long for column 'column_name'
How do I remedy this error?
回答1:
This may seem pretty obvious, and it is. You apparently tried to insert or update a row with a value for the 'column_name' column that is larger than will fit into said column.
If it's CHAR or VARCHAR, for example, you probably have a string that's longer than the defined size of the column.
Your choices for fixing this are also somewhat obvious - either make sure that the data that you store is no larger than the column (perhaps by truncating longer strings before storing them), or increase the size of the database column.
回答2:
How to reproduce this error in mysql terminal:
mysql> create table penguins(val CHAR(2));
Query OK, 0 rows affected (0.08 sec)
mysql> insert into penguins values("AB");
Query OK, 1 row affected (0.00 sec)
mysql> insert into penguins values("ABC");
Query OK, 1 row affected, 1 warning (0.01 sec)
mysql> show warnings;
+---------+------+------------------------------------------+
| Level | Code | Message |
+---------+------+------------------------------------------+
| Warning | 1265 | Data truncated for column 'val' at row 1 |
+---------+------+------------------------------------------+
1 row in set (0.00 sec)
This is the error you are getting, however in the MySQL terminal shows it as a warning and still inserts your row, just silently truncates it.
The MySQL JDBC is not as forgiving, and spits a hard error and will not insert the row.
2 Solutions
Either Increase the capacity of the datatype you are inserting into, or decrease the size of the content you are placing in there.
Legend to increase the size of your column:
If you are using then use this
----------------- --------------
smallint int
int long
TEXT LONGTEXT
LONGTEXT CLOB
CLOB Store the content to disk, and save the filename in the db.
回答3:
I faced same issue in my spring boot data jpa application when i going to insert image file in data base as byte its given me same error.
After many R & D i found solution like below.
I added below line in my application.properties file and resolve that
spring.datasource.url=jdbc:mysql://localhost:3306/conweb?sessionVariables=sql_mode='NO_ENGINE_SUBSTITUTION'&jdbcCompliantTruncation=false
Hope it will helpful to someone.
回答4:
In my case The uploaded data contains quotation marks(' and "). That's why I get the same exception you mentioned above. After removing the quotation marks inside data successfully inserted to the tables.
回答5:
I encountered same issue in my Spring Boot application while uploading an Image/Word/PDF file and fixed it with the below steps:
Solution
- Please have a look at the size of the file that you are trying to upload.
- Then compare that file size with the Max size allowed by your mapped Database FIELD type.
- For example for LOB's:
TINYBLOB ≈ 255 bytes, BLOB ≈ 64KB, MEDIUMBLOB ≈ 16MB and LONGBLOB ≈ 4GB Run Use Alter table command as per your Space requirements:
ALTER TABLE 'TABLE_NAME' MODIFY 'FIELD_NAME' MEDIUMBLOB;
Note: It is always recommended to save a Link but not the actual file (having large sizes) in DB.
回答6:
This error appears because,the size of data you tried to insert into column is too large.
Solution - Change the column size to max.Assuming your column is of type VARCHAR,then in mySQL
ALTER TABLE table_name CHANGE COLUMN col_name col_name VARCHAR(1000); //assuming 1000 is enough
回答7:
For those who stumble upon here, there could be another reason for similar error:
The type of the Stored Procedure parameter might be a limiting factor.
Eg: You have the corresponding column data type and the data sent to MySQL server as LONGTEXT while the parameter of the stored procedure to which you are sending LONGTEXT data may be having type TEXT. In this case you need to update the parameter data type
来源：https://stackoverflow.com/questions/13567155/com-mysql-jdbc-mysqldatatruncation-data-truncation-data-too-long-for-column-c