我正在开发一个应用程序，我需要检索一些数据并将其存储在 SQLite 数据库中。我正在使用 SQLiteOpenHelper。这里 databaseHandler.addDetails(obj); 呈现错误消息。任何帮助，将不胜感激。这是我的代码。
Register.java
public class Register extends Activity{
// variables for all text data.
String FIRSTNAME = null;
String LASTNAME = null;
String USERNAME = null;
String PASSWORD = null;
String CITY= null;
// variables for individual ID s .
EditText fnameText = null;
EditText lnameText = null;
EditText unameText = null;
EditText passText = null;
EditText cityText = null;
Button redg = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
fnameText = (EditText)findViewById(R.id.editText1);
lnameText = (EditText)findViewById(R.id.editText2);
unameText = (EditText)findViewById(R.id.editText3);
passText = (EditText)findViewById(R.id.editText4);
cityText = (EditText)findViewById(R.id.editText5);
redg = (Button)findViewById(R.id.button1);
// button click event
redg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
System.out.println("On click event of Register Activity..........");
UserDetailsClass obj = new UserDetailsClass();
FIRSTNAME = fnameText.getText().toString();
LASTNAME = lnameText.getText().toString();
USERNAME = unameText.getText().toString();
PASSWORD = passText.getText().toString();
CITY = cityText.getText().toString();
obj.setFname(FIRSTNAME);
obj.setLname(LASTNAME);
obj.setUname(USERNAME);
obj.setPass(PASSWORD);
obj.setCity(CITY);
System.out.println("object set in Register Activity........");
DatabaseHandler databaseHandler = new DatabaseHandler(getApplicationContext());
System.out.println("Database handler created ........");
databaseHandler.addDetails(obj);
}
});
}
}
DatabaseHandler.java
public class DatabaseHandler extends SQLiteOpenHelper{
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "UserManager";
// Contacts table name
private static final String USER_DETAILS = "userdetails";
// Contacts Table Columns names
private static final String KEY_FNAME = "fname";
private static final String KEY_LNAME = "lname";
private static final String KEY_USERNAME = "username";
private static final String KEY_PASSWORD = "password";
private static final String KEY_CITY = "city";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
System.out.println(" begin of table creation...");
String CREATE_USER_TABLE = "CREATE TABLE " + USER_DETAILS + "(" + KEY_FNAME + "TEXT,"
+ KEY_LNAME + "TEXT," + KEY_PASSWORD + "TEXT," + KEY_USERNAME + " TEXT PRIMARY KEY,"
+ KEY_CITY + " TEXT" + ")";
db.execSQL(CREATE_USER_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + USER_DETAILS);
// Create tables again
onCreate(db);
}
// REGISTERING USER METHOD
void addDetails(UserDetailsClass obj) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_FNAME, obj.getFname());
values.put(KEY_LNAME, obj.getLname());
values.put(KEY_USERNAME, obj.getUname());
values.put(KEY_PASSWORD, obj.getPass());
values.put(KEY_CITY, obj.getCity());
// Inserting Row
db.insert(USER_DETAILS, null, values);
db.close(); // Closing database connection
}
// Getting single contact
UserDetailsClass getDetails(String uname, String pass) {
SQLiteDatabase db = this.getReadableDatabase();
System.out.println("I'm in getDetails() of DatabaseHandler .......");
Cursor cursor = db.query(USER_DETAILS, new String[] { KEY_FNAME,KEY_LNAME,KEY_USERNAME,
KEY_PASSWORD, KEY_CITY }, KEY_USERNAME + "=? & " + KEY_PASSWORD + "=?",
new String[] { String.valueOf(uname), String.valueOf(pass) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
UserDetailsClass obj1 = new UserDetailsClass();
obj1.setFname(cursor.getString(0));
obj1.setLname(cursor.getString(1));
obj1.setUname(cursor.getString(2));
obj1.setPass(cursor.getString(3));
obj1.setCity(cursor.getString(4));
// return contact
return obj1;
}
}
UserDetailsClass.java
public class UserDetailsClass {
public String fname = null;
public String lname = null;
public String Uname = null;
public String Pass = null;
public String city = null;
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getLname() {
return lname;
}
public void setLname(String lname) {
this.lname = lname;
}
public String getUname() {
return Uname;
}
public void setUname(String uname) {
Uname = uname;
}
public String getPass() {
return Pass;
}
public void setPass(String pass) {
Pass = pass;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
}
这是我的 logcat。
01-10 18:08:46.782: E/Database(334): Error inserting username=jmwtp lname=gjtp password=ajtp fname=gjm city=address
01-10 18:08:46.782: E/Database(334): android.database.sqlite.SQLiteException: table userdetails has no column named lname: , while compiling: INSERT INTO userdetails(username, lname, password, fname, city) VALUES(?, ?, ?, ?, ?);
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:41)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1149)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1569)
01-10 18:08:46.782: E/Database(334): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1426)
01-10 18:08:46.782: E/Database(334): at com.bam.testdatabse.DatabaseHandler.addDetails(DatabaseHandler.java:67)
01-10 18:08:46.782: E/Database(334): at com.bam.testdatabse.Register$1.onClick(Register.java:62)
01-10 18:08:46.782: E/Database(334): at android.view.View.performClick(View.java:2485)
01-10 18:08:46.782: E/Database(334): at android.view.View$PerformClick.run(View.java:9080)
01-10 18:08:46.782: E/Database(334): at android.os.Handler.handleCallback(Handler.java:587)
01-10 18:08:46.782: E/Database(334): at android.os.Handler.dispatchMessage(Handler.java:92)
01-10 18:08:46.782: E/Database(334): at android.os.Looper.loop(Looper.java:123)
01-10 18:08:46.782: E/Database(334): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-10 18:08:46.782: E/Database(334): at java.lang.reflect.Method.invokeNative(Native Method)
01-10 18:08:46.782: E/Database(334): at java.lang.reflect.Method.invoke(Method.java:507)
01-10 18:08:46.782: E/Database(334): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-10 18:08:46.782: E/Database(334): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-10 18:08:46.782: E/Database(334): at dalvik.system.NativeStart.main(Native Method)
最佳答案
您的数据库创建中缺少空格:
String CREATE_USER_TABLE = "CREATE TABLE " + USER_DETAILS + "(" + KEY_FNAME + "TEXT,"
+ KEY_LNAME + "TEXT," + KEY_PASSWORD + "TEXT," + KEY_USERNAME + " TEXT PRIMARY KEY,"
+ KEY_CITY + " TEXT" + ")";
更改为:
String CREATE_USER_TABLE = "CREATE TABLE " + USER_DETAILS + "(" + KEY_FNAME + "TEXT,"
+ KEY_LNAME + " TEXT," + KEY_PASSWORD + " TEXT," + KEY_USERNAME + " TEXT PRIMARY KEY,"
+ KEY_CITY + " TEXT" + ")";
关于java - 如何在Android中编写SQLite execSQL函数？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14258540/