Question

使用@hotmail

插入数据时插入数据时出现问题

这是错误

11-28 08:07:19.684: E/CREATE TABLE ERROR(21840): android.database.sqlite.SQLiteException: near "@hotmail": syntax error: , while compiling: INSERT INTO user_table SELECT han AS userName,  123 AS password,  han@hotmail.com AS emailAddress,  0123456678 AS phoneNuber,  50.00 AS balance  UNION SELECT felicia, 123, felicia@hotmail.com, 0123456678, 100.00

但是当我删除@hotmail时，我遇到了另一个没有这样的列的问题

11-28 08:16:06.704: E/CREATE TABLE ERROR(24403): android.database.sqlite.SQLiteException: no such column: felicia: , while compiling: INSERT INTO user_table SELECT han AS userName,  123 AS password,  han AS emailAddress,  0123456678 AS phoneNuber,  50.00 AS balance  UNION SELECT felicia, 123, felicia, 0123456678, 100.00

这是我的表

String createuser = "CREATE TABLE user_table (_id integer primary key autoincrement not null, "
                + "userName text,"
                + "password text,"
                + "emailAddress text,"
                + "phoneNumber text,"
                + "balance text);";

这是我的数据插页

String data = " INSERT INTO user_table SELECT han AS userName, "
                + " 123 AS password, "
                + " han@hotmail.com AS emailAddress, "
                + " 0123456678 AS phoneNuber, "
                + " 50.00 AS balance "
                + " UNION SELECT felicia, 123, felicia@hotmail.com, 0123456678, 100.00 ";

        try
        {
            db.execSQL(createuser);
            db.execSQL(data);
        }
        catch(Exception e)
        {
            Log.e("CREATE TABLE ERROR", e.toString());
            e.printStackTrace();
        }

Answer 1

呸。作为[潜在]开发人员，您期望自行解决语法问题。

这里有两个重要的步骤

建立一个可以轻松测试语法/行为的环境
理解（并积极学习）语法。

对于初学者，让我们使用数据库命令行界面。可以在PC上使用sqlite3.exe，也可以在Android上使用（有几个！）或SQLFiddle之类的内容。我将使用SQLFiddle，以便我们都可以参与，whoohoo！

接下来的一点是理解语法。 SQLite INSERT的语法与图形化列车轨道完美配合。（免费赠品：ANSI SQL语法中的文本文字写成'字符串'。）

话虽如此，请参阅this fiddle。随意玩吧。

CREATE TABLE user_table (
  _id integer primary key autoincrement not null, 
  userName text,
  password text,
  emailAddress text,
  phoneNumber text,
  balance text);

-- INSERT from a select
-- This REQUIRES that the column as specified after the table name
insert into user_table (userName, password, emailAddress, phoneNumber, balance)
select
  'han' as userName,
   123 AS password,
  'han@hotmail.com' AS emailAddress,
  '0123456678' AS phoneNuber,
  50.00 AS balance;

-- Insert from VALUES, if they match and are in-order, do not
-- need the column names.
-- Insert NULL into _id to get the auto-increment behavior.
insert into user_table
values (NULL, 'han2', 123, 'han@hotmail.com', '0123456678', 50.00);

-- Multi-insert from SELECT (could also be done with VALUES)
insert into user_table (userName, password, emailAddress, phoneNumber, balance)
select
  'han3' as userName,
   123 AS password,
  'han@hotmail.com' AS emailAddress,
  '0123456678' AS phoneNuber,
  50.00 AS balance
union select
  'han4' as userName,
   123 AS password,
  'han@hotmail.com' AS emailAddress,
  '0123456678' AS phoneNuber,
  50.00 AS balance

现在，虽然这适用于直接SQL查询，但在将工作查询移植到Android时，您需要适应占位符 - 即，SQL命令看起来像insert into user_table values (NULL, ?, ?, ?, ?, ?)（其中每个?是一个占位符），然后值数组将提供给使用SQL字符串的相应方法调用

Android还支持像SQLiteDatabase.insert这样的基本形式，它们非常有用，可以处理很多“常见的垃圾”。 execSQL的文档建议不使用execSQL进行基本的INSERT / UPDATE / DELETE操作，这对于常见场景是很好的建议 - 在单个事务中多次调用insert将是从代码维护的角度来看，“好”（也许更好，从代码维护的角度来看）作为更复杂的手动多插入。

Answer 2

Refer the docs to learn about sqlite queries

您的语法错误，在引号'TEXT GOES HERE'中插入文字而您错过了,

将数据插入SQLite时出错

2 个答案: