VARCHAR2 字段中可以存储的字符数是否受字符集影响？
Is the number of characters that can be stored in a VARCHAR2 field influenced by the charset?
在我们客户的数据库中设置了以下字符集：
NLS_CHARACTERSET AL32UTF8
在我的本地数据库上配置如下：
NLS_CHARACTERSET AL32UTF8
当对我们客户的数据库执行插入到 VARCHAR2(4000) 列时，会发生此错误：
Caused by: java.sql.SQLException: ORA-01461: can bind a LONG value
only for insert into a LONG column
在我的电脑上一切正常。
值是使用 java.sql.PreparedStatement 和 preparedStatement.setString(3, value3); 绑定的。
会不会是字符集不同导致的错误？字符集是否影响可以存储在 VARCHAR2 字段中的字符数量？
Prior to Oracle 12.1, a VARCHAR2 column is limited to storing 4000
bytes of data in the database character set even if it is declared
VARCHAR2(4000 CHAR). Since every character in your string requires 2
bytes of storage in the UTF-8 character set, you won't be able to
store more than 2000 characters in the column. Of course, that number
will change if some of your characters actually require just 1 byte of
storage or if some of them require more than 2 bytes of storage.
另见 this answer。
在我们客户的数据库中设置了以下字符集：
NLS_CHARACTERSET AL32UTF8
在我的本地数据库上配置如下：
NLS_CHARACTERSET AL32UTF8
当对我们客户的数据库执行插入到 VARCHAR2(4000) 列时，会发生此错误：
Caused by: java.sql.SQLException: ORA-01461: can bind a LONG value only for insert into a LONG column
在我的电脑上一切正常。
值是使用 java.sql.PreparedStatement 和 preparedStatement.setString(3, value3); 绑定的。
会不会是字符集不同导致的错误？字符集是否影响可以存储在 VARCHAR2 字段中的字符数量？
Prior to Oracle 12.1, a VARCHAR2 column is limited to storing 4000 bytes of data in the database character set even if it is declared VARCHAR2(4000 CHAR). Since every character in your string requires 2 bytes of storage in the UTF-8 character set, you won't be able to store more than 2000 characters in the column. Of course, that number will change if some of your characters actually require just 1 byte of storage or if some of them require more than 2 bytes of storage.
另见 this answer。