数据库SQL语句错误

  Caused by: android.database.sqlite.SQLiteException: near "where": syntax error(Sqlite code 1): , while compiling: select * from wenjian  where 1=1  and where cehao=1288,(OS error - 2:No such file or directory)
                                                                         at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
                                                                         at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
                                                                         at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
                                                                         at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
                                                                         at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
                                                                         at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
                                                                         at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
                                                                         at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1334)
                                                                         at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1268)

 

<1>上面是数据库语句写错了：select * from wenjian  where 1=1  and where cehao=1288 

　　　　应该只用一个where  ：select * from wenjian  where 1=1  and  cehao=1288

 

  Caused by: android.database.sqlite.SQLiteException: unrecognized token: "01端"(Sqlite code 1): , while compiling: select * from wenjian  where 1=1  and  duanhao=01端,(OS error - 2:No such file or directory)
                                                                       at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
                                                                       at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
                                                                       at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
                                                                       at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
                                                                       at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
                                                                       at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
                                                                       at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
                                                                       at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1334)
                                                                       at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1268)

 

 

Caused by: android.database.sqlite.SQLiteException: no such column: LOG(Sqlite code 1): , while compiling: select * from wenjian  where 1=1  and  gongneng=LOG,(OS error - 2:No such file or directory)
                                                                       at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
                                                                       at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
                                                                       at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
                                                                       at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
                                                                       at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
                                                                       at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
                                                                       at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
                                                                       at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1334)
                                                                       at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1268)

 

 

最后解决:

select * from wenjian  where 1=1  and cehao=1288 

这里的数据库表字段都是定义为vachar ，但是cehao字段里面都是存储的数字，这里在拼接sql语句时，这样写是可以运行正确的。

但是当字段存储的数据不是数字，而是字符串的话，需要加单引号(英文单引号不区分左右的)，语句应该为：

select * from wenjian  where 1=1  and cehao=1288 and duanhao=‘01端’

 

基础语句不会啊……浪费了2个小时。

学习……