Question

我收到了错误

警告| 1366 |不正确的整数值：''对于第34行的列running_time_minutes'

使用以下脚本。该错误也适用于列footage_lenght_feet。我的.csv对于许多单元格都有空值，但这是因为答案未知。我不明白为什么即使我为这个列指定了'default NULL'，它仍然会返回错误。

    -- create the Films table

    DROP TABLE IF EXISTS Films;

    CREATE TABLE Films (

    title varchar (100) NOT NULL,
    alternate_title varchar (50),
    year_of_release varchar (15),   
    Country varchar (20),
    running_time_minutes int (10) default NULL,
    footage_lenght_feet int (10) default NULL,
    FilmStock varchar (10),
    FilmGauge varchar (10),
    BW_color varchar (10),
    notes varchar (255),
    print_publications varchar (255),
    existent_print varchar (255),
    URL_1 varchar (100),
    URL_2 varchar (100),
    URL_3 varchar (100),
    PRIMARY KEY(title),
    FOREIGN KEY(Country) REFERENCES Country (Country),
    FOREIGN KEY(FilmStock) REFERENCES FilmStock (FilmStock),
    FOREIGN KEY(BW_color) REFERENCES BW_color (BW_color),
    FOREIGN KEY(FilmGauge) REFERENCES FilmGauge (FilmGauge));
    ENGINE = INNODB;

    LOAD DATA LOCAL INFILE "Films.csv"
    INTO TABLE Films
    FIELDS TERMINATED BY ','
    ENCLOSED BY '"'
    LINES TERMINATED BY '\n'
    IGNORE 1 LINES;

Answer 1

您没有发布任何数据，所以这有点推测，但我从您的评论中假设您有一个类似的输入文件：

"Title", "Alternate Title", "Year of Release", "Country","Running Time (minutes)", "Footage Length (feet)", "Filmstock","FilmGauge", "BW/Colour", "Notes", "Print Publications", "Existent Print", "URL1", "URL2","URL3"
"A title","","1958","UK","102","38000","","Kodak","70mm","BW","","","","",""
"Another title","","1958","UK",,"38000","","Kodak","70mm","BW","","","","",""

（请注意，在第二行数据中，与running_time_minutes对应的字段为空。）

当MySQL读取此文件时，它会根据您提供的说明将每行解析为字段：

LOAD DATA LOCAL INFILE "Films.csv"
    INTO TABLE Films
    FIELDS TERMINATED BY ','
    ENCLOSED BY '"'
    LINES TERMINATED BY '\n'
    IGNORE 1 LINES;

然后它尝试将数据强制转换为表中目标列的正确形式。 varchar列不需要强制，因此它们很容易。在存储数字列之前，需要将数字列强制转换为数字。

这适用于具有数字数据的列（例如字符串102），但是当MySQL遇到空列时，它会将其视为空字符串。这与NULL不同，并且不是数字，也不能强制转换为目标列的正确格式。因此，您会看到警告。

你需要在这里给MySQL一些帮助。添加列列表，将用户变量替换为您遇到问题的数字列。然后，您可以给MySQL明确指示如何处理数字字段。

LOAD DATA LOCAL INFILE "Films.csv"
    INTO TABLE Films
    FIELDS TERMINATED BY ','
    ENCLOSED BY '"'
    LINES TERMINATED BY '\n'
    IGNORE 1 LINES
    -- Put the numeric fields in user variables (names prefixed by @)
    (title, alternate_title, year_of_release, Country, @runningTime,
       @footageLength, FilmStock, Filmgauge, BW_color, notes, 
       print_publications, existent_print, URL_1, URL_2, URL_3
    ) 
    -- Now check for empty strings and set the numeric columns to null if they're found
    set running_time_minutes = if(@runningTime="", null, @runningTime),
        footage_lenght_feet = if(@footageLength="", null, @footageLength)

警告| 1366 |不正确的整数值：第34行

1 个答案: