[英]Batch processing JDBC
I am practicing JDBC batch processing and having errors: 我正在练习JDBC批处理并有错误:
error 1: Unsupported feature error 2: Execute cannot be empty or null 错误1:不支持的功能错误2:执行不能为空或为空
Property files include:
itemsdao.updateBookName = Update Books set bookname = ? where books.id = ?
itemsdao.updateAuthorName = Update books set authorname = ? where books.id = ?
I know I can execute about DML statements in one update, but I am practicing batch processing in JDBC. 我知道我可以在一次更新中执行DML语句,但我正在JDBC中练习批处理。
Below is my method 以下是我的方法
public void update(Item item) {
String query = null;
try {
connection = DbConnector.getConnection();
property = SqlPropertiesLoader.getProperties("dml.properties");
connection.setAutoCommit(false);
if ( property == null )
{
Logging.log.debug("dml.properties does not exist. Check property loader or file name is spelled right");
return;
}
query = property.getProperty("itemsdao.updateBookName");
statement = connection.prepareStatement(query);
statement.setString(1, item.getBookName());
statement.setInt(2, item.getId());
statement.addBatch(query);
query = property.getProperty("itemsdao.updateAuthorName");
statement = connection.prepareStatement(query);
statement.setString(1, item.getAuthorName());
statement.setInt(2, item.getId());
statement.addBatch(query);
statement.executeBatch();
connection.commit();
}catch (ClassNotFoundException e) {
Logging.log.error("Connection class does not exist", e);
}
catch (SQLException e) {
Logging.log.error("Violating PK constraint",e);
}
//helper class th
finally {
DbUtil.close(connection);
DbUtil.closePreparedStatement(statement);
}
You are mixing together methods of Statement
and PreparedStatement
classes: 您正在将
Statement
和PreparedStatement
类的方法混合在一起:
(addBatch(String sql)
belongs to Statement
and cannot be called on a PreparedStatement
or CallableStatement
(addBatch(String sql)
属于Statement
, 不能在PreparedStatement
或CallableStatement
addBatch()
is to be used with PreparedStatement
(as your tutorial shows). addBatch()
将与PreparedStatement
一起使用(如教程所示)。
Oracle implements both it's own and standard (JDBC 2.0) batch processing. Oracle实现了自己的和标准的 (JDBC 2.0)批处理。 From the Standard Update Batching docs :
从标准更新批处理文档 :
In Oracle JDBC applications, update batching is intended for use with prepared statements that are being processed repeatedly with different sets of bind values.
在Oracle JDBC应用程序中,更新批处理旨在与使用不同绑定值集重复处理的预准备语句一起使用。
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