問題描述

這是我非常簡單的表(Postgres):

here is my very simple table (Postgres):

CREATE TABLE IF NOT EXISTS PERFORMANCE.TEST
(
test text NOT NULL UNIQUE
);

如果我嘗試使用以下命令從數據庫中插入字符串，一切都會按預期進行，毫不奇怪，數據庫中會出現一個新行.

if I try to insert a String using the command below FROM the database,everything works as expected, not surprisingly a new row appears in the DB.

insert into performance.test (test) values ('abbbbaw');

但是，如果我想通過 JDBC 插入字符串，則不會插入任何內容，盡管preparedStatement.executeUpdate() 總是返回 1.

However if I want to insert a String through JDBC, nothing gets inserted, although preparedStatement.executeUpdate() always returns 1.

以下是我的方法，它應該有效，但它沒有.如果我遺漏了一些明顯的東西，請告訴我.我想補充一點，我從來沒有收到任何 SQLException.

Below is my method that should be working but it does not. Please tell me if I am missing something obvious. I want to add that I never get any SQLException.

private void storePerformance() {
    Connection conn= initializePerformanceConnection();
    if (conn!= null) {
       PreparedStatement insertPS = null;
        try {
            insertPS = conn.prepareStatement("insert into performance.test (test) values (?)");
            insertPS.setString(1, queryVar);
             int i = insertPS.executeUpdate();
            LogManager.doLog(LOG, LOGLEVEL.INFO," numberofrows= "+i);

        }  catch (SQLException e) {
            LogManager.doLog(LOG, LOGLEVEL.INFO,"Inserting query failed = "+queryVar,e);
        }finally{
            if(insertPS != null){
                try {
                    insertPS.close();
                } catch (SQLException e) {
                    LogManager.doLog(LOG, LOGLEVEL.INFO,"Closing PreparedStatement failed = "+queryVar,e);
                }
            }
            try {
                conn.close();
            } catch (SQLException e) {
                LogManager.doLog(LOG, LOGLEVEL.INFO,"Closing performanceConnection failed= "+ queryVar, e);
            }
        }           
    }
}

推薦答案

不見了:

conn.commit();

(在 executeUpdate() 之后)

(after the executeUpdate())

實際上插入了一個新行，但數據庫立即回滾.

actually a new row was inserted but the DB rolled back immediately.

這篇關于為什么即使沒有插入新行，executeUpdate 也會返回 1?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！