下面是我multiple records( around 5000-7000)
使用 Prepared Statement 插入 Oracle 数据库的代码。
我目前的做法好吗?或者它可以使用一些改进更多batch thing
?
pstatement = db_connection.prepareStatement(PDSLnPConstants.UPSERT_SQL);
for (Entry<Integer, LinkedHashMap<Integer, String>> entry : MAPPING.entrySet()) {
pstatement.setInt(1, entry.getKey());
pstatement.setString(2, entry.getValue().get(LnPConstants.CGUID_ID));
pstatement.setString(3, entry.getValue().get(LnPConstants.PGUID_ID));
pstatement.setString(4, entry.getValue().get(LnPConstants.SGUID_ID));
pstatement.setString(5, entry.getValue().get(LnPConstants.UID_ID));
pstatement.setString(6, entry.getValue().get(LnPConstants.ULOC_ID));
pstatement.setString(7, entry.getValue().get(LnPConstants.SLOC_ID));
pstatement.setString(8, entry.getValue().get(LnPConstants.PLOC_ID));
pstatement.setString(9, entry.getValue().get(LnPConstants.ALOC_ID));
pstatement.setString(10, entry.getValue().get(LnPConstants.SITE_ID));
pstatement.executeUpdate();
pstatement.clearParameters();
}
我正在使用的更新代码:-
public void runNextCommand() {
Connection db_connection = null;
PreparedStatement pstatement = null;
int batchLimit = 1000;
boolean autoCommit = false;
try {
db_connection = getDBConnection();
autoCommit = db_connection.getAutoCommit();
db_connection.setAutoCommit(false); //Turn off autoCommit
pstatement = db_connection.prepareStatement(LnPConstants.UPSERT_SQL); // create a statement
for (Entry<Integer, LinkedHashMap<Integer, String>> entry : GUID_ID_MAPPING.entrySet()) {
pstatement.setInt(1, entry.getKey());
pstatement.setString(2, entry.getValue().get(LnPConstants.CGUID_ID));
pstatement.setString(3, entry.getValue().get(LnPConstants.PGUID_ID));
pstatement.setString(4, entry.getValue().get(LnPConstants.SGUID_ID));
pstatement.setString(5, entry.getValue().get(LnPConstants.UID_ID));
pstatement.setString(6, entry.getValue().get(LnPConstants.ULOC_ID));
pstatement.setString(7, entry.getValue().get(LnPConstants.SLOC_ID));
pstatement.setString(8, entry.getValue().get(LnPConstants.PLOC_ID));
pstatement.setString(9, entry.getValue().get(LnPConstants.ALOC_ID));
pstatement.setString(10, entry.getValue().get(LnPConstants.SITE_ID));
pstatement.addBatch();
batchLimit--;
if(batchLimit == 0){
pstatement.executeBatch();
pstatement.clearBatch();
batchLimit = 1000;
}
pstatement.clearParameters();
}
} catch (SQLException e) {
getLogger().log(LogLevel.ERROR, e);
} finally {
try {
pstatement.executeBatch();
db_connection.commit();
db_connection.setAutoCommit(autoCommit);
} catch (SQLException e1) {
getLogger().log(LogLevel.ERROR, e1.getMessage(), e1.fillInStackTrace());
}
if (pstatement != null) {
try {
pstatement.close();
pstatement = null;
} catch (SQLException e) {
getLogger().log(LogLevel.ERROR, e.getMessage(), e.fillInStackTrace());
}
}
if (db_connection!= null) {
try {
db_connection.close();
db_connection = null;
} catch (SQLException e) {
getLogger().log(LogLevel.ERROR, e.getMessage(), e.fillInStackTrace());
}
}
}
}