将数据插入 DB android 时出错

Question

我在数据库中有两个表，条目只有列词，另一个表 worddictionary 有列 word、define 和 auduiourl，

 String create_table_query = "CREATE TABLE `entries` (`word` varchar(50) NOT NULL)";
 db.execSQL(create_table_query);

 String create_word_table = "CREATE TABLE `worddictionary` (`word` TEXT NOT NULL,'definition' TEXT, 'audiourl' TEXT)";
 db.execSQL(create_word_table);

我正在尝试将使用 web 刮到 worddictionary 表中的单词、其定义和 audiourl 插入，

 String insert_query = "INSERT INTO worddictionary values("+word+","+wordDefinition+","+audioUrl+")";
 db.execSQL(insert_query);

但我得到以下错误，

2020-07-13 14:11:56.527 27078-27131/com.example.scraping_synonyms E/SQLiteLog: (1) near "large": syntax error
2020-07-13 14:11:56.529 27078-27131/com.example.scraping_synonyms E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: com.example.scraping_synonyms, PID: 27078
    java.lang.RuntimeException: An error occurred while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:354)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
        at java.util.concurrent.FutureTask.run(FutureTask.java:271)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: android.database.sqlite.SQLiteException: near "large": syntax error (code 1 SQLITE_ERROR): , while compiling: INSERT INTO worddictionary values(aardvark,noun,
    a large, nocturnal, burrowing mammal, Orycteropus afer, of central and southern Africa, feeding on ants and termites and having a long, extensile tongue, strong claws, and long ears.
    ,https://static.sfdict.com/audio/A00/A0001900.mp3)
        at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
        at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:903)
        at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:514)
        at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
        at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
        at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
        at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1770)
        at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1698)
        at com.example.scraping_synonyms.MainActivity$Content.doInBackground(MainActivity.java:140)
        at com.example.scraping_synonyms.MainActivity$Content.doInBackground(MainActivity.java:74)
        at android.os.AsyncTask$2.call(AsyncTask.java:333)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

在这个错误中，在“大”附近提到了错误，即定义中的词我不明白错误是什么

Answer 1

这可能是因为word周围的标记与definition不同吗？

我替换的那个人使用了 Content 值，所以对你来说它是

ContentValues values = new ContentValues();
values.put("word", word);
values.put("definition", definition);
values.put("audiourl", audiourl);

db.insert("worddictionary", null, values);

Answer 2

您想在表worddictionary中插入一行 3 列，但您所做的是尝试通过连接字符串word 、 wordDefinition和audioUrl仅插入 1 个字符串。

INSERT语句的正确语法是这样的：

INSERT INTO tablename(col1, col2, col3) VALUES (value1, value2, value3)

如果任何值是字符串，则必须用单引号括起来。

因此，为了在语法上正确，您应该在表名之后枚举所有列名并分别插入每一列：

String insert_query = "INSERT INTO worddictionary (word, wordDefinition, audioUrl) values ('" + 
                      word + "', '" + wordDefinition + "', '" + audioUrl + "')";
db.execSQL(insert_query);

但是推荐和安全的方法是使用方法insert()和ContentValues()在这些情况下处理引号：

ContentValues cv = new ContentValues();
cv.put("word", word);
cv.put("definition", wordDefinition);
cv.put("audiourl", audioUrl);
int result = db.insert("worddictionary", cv);

您可以在插入后检查变量result 。
如果是-1则发生错误。