Programmer Group

Preface Data loading mechanism is similar to data extraction mechanism, which can be divided into full load and incremental load. Full load refers to the operation of loading data after deleting all the data in the target data table. Incremental loading, on the other hand, means that the target table only loads data that changes in the s ...

JDBC connection pool summary The creation and destruction of Connection objects for one-time use takes time. Connection pool can reuse connections and avoid waste. When the program initializes, it initializes multiple connections and puts them into the pool (Collection). Each time, it can be obtained directly from the connection pool. After u ...