我在SO中检查了其他示例,我搜索了很多,没有什么对我有用。数据库文件为this(建议编辑后)。
错误
E/Database(274): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed
E/Database(274): at android.database.sqlite.SQLiteStatement.native_execute(Native Method)
E/Database(274): at android.database.sqlite.SQLiteStatement.execute(SQLiteStatement.java:55)
E/Database(274): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1549)
E/Database(274): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1410)
E/Database(274): at com.example.nycgasstationhunter.userRegister$2.onClick(userRegister.java:51)
E/Database(274): at android.view.View.performClick(View.java:2408)
E/Database(274): at android.view.View$PerformClick.run(View.java:8816)
E/Database(274): at android.os.Handler.handleCallback(Handler.java:587)
E/Database(274): at android.os.Handler.dispatchMessage(Handler.java:92)
E/Database(274): at android.os.Looper.loop(Looper.java:123)
E/Database(274): at android.app.ActivityThread.main(ActivityThread.java:4627)
E/Database(274): at java.lang.reflect.Method.invokeNative(Native Method)
E/Database(274): at java.lang.reflect.Method.invoke(Method.java:521)
E/Database(274): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/Database(274): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/Database(274): at dalvik.system.NativeStart.main(Native Method)
代码
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
public class userRegister extends Activity{
//database
SQLiteDatabase db;
DBHelper dbhelper;
Context ourContext;
ContentValues cv;
public void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_register);
//database
dbhelper=new DBHelper(this);
db=dbhelper.getWritableDatabase();
cv=new ContentValues();
//editText
final EditText userEdit=(EditText) findViewById(R.id.userEdit);
final EditText emailEdit=(EditText) findViewById(R.id.emailEdit);
final EditText passwordEdit=(EditText) findViewById(R.id.passwordEdit);
final EditText retypePassEdit=(EditText) findViewById(R.id.retypePassEdit);
//Register button
Button regButton = (Button) findViewById(R.id.regButton);
regButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//string
final String userName=userEdit.getText().toString();
final String emailAddress=emailEdit.getText().toString();
final String password=passwordEdit.getText().toString();
final String retypePassword=retypePassEdit.getText().toString();
if (userName.length()!=0){
if (emailAddress.length()!=0){
if (password.length()!=0){
if (retypePassword.equals(password)){
//save in DB
cv.put(DBHelper.USER, userName);
cv.put(DBHelper.EMAIL,emailAddress);
cv.put(DBHelper.PASSWORD, retypePassword);
db.insert(DBHelper.USER_TABLE, null, cv);
Intent intent = new Intent (userRegister.this,Profile.class);
startActivity(intent);
}
else
Toast.makeText(userRegister.this,"Password mismatch", Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(userRegister.this,"Invalid password", Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(userRegister.this,"Invalid email", Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(userRegister.this,"Invalid user name", Toast.LENGTH_SHORT).show();
}
});
}
}
当我插入信息并按regButton时,它会将我发送到个人资料活动。数据库中没有保存信息。我不明白LogCat中的错误,我该如何解决?为什么数据库中什么都没有? (我使用SQLite Database Browser来检查数据。)谢谢
答案 0 :(得分:6)
错误SQLiteConstraintException
表示违反了完整性约束。
从您的Create Table SQL命令我认为第一个问题是您的主键。它应该声明为autoincrement
更改字符串createDB:
public final String createDB="create table "+USER_TABLE+"("
+ C_ID + " integer primary key autoincrement, "
+ USER + " text not null,"
+ EMAIL + " text not null,"
+ PASSWORD + " text not null,"
+ TIME + " text not null);";
此外,所有字段都声明为not null
,您应该测试retypePassword
是否为空,并且您必须将值设置为字段TIME。
编辑
为了使autoincrement
生效,需要增加数据库版本值
在DBHelper类中,将DATABASE_VERSION=1;
更改为DATABASE_VERSION=2;
答案 1 :(得分:2)
如果你在评论中提到数据库模式如下(来自this question)...
public final String createDB="create table "+USER_TABLE+"("
+C_ID+" integer primary key, "
+USER+" text not null,"
+EMAIL+ " text not null,"
+PASSWORD+ " text not null,"
+TIME+ " text not null);";
...然后您没有为具有TIME
约束的not null
列指定值。
一些选项:
在TIME
之前向ContentValues
添加insert()
值。
更改架构并提供合适的默认值,例如
TIME + " text not null default current_timestamp"
与往常一样,在更改数据库架构时,请删除旧数据库,以便使用新代码调用onCreate()
(清除应用程序数据或仅卸载应用程序)。
答案 2 :(得分:0)
就我而言,我进行了两个HTTP请求并获得了两个列表。然后将它们写入两个表。但是首先在子表中,然后在父表中。很奇怪,但是在Android 4.4.2上出现了问题,但在Android 5.0上却没有。