我的问题特别是我希望能够创建动态模板，具体取决于某个记录中包含的项目类型。我想将这些组件作为字符串存储在数据库中，并在加载项时动态呈现它们。模板需要能够处理动态反应变量。它们不仅仅是html字符串，就像stackoverflow中的一些其他示例一样。
怎么可能这样做呢？它甚至可能吗？
答案 0 :(得分：1)
您可以使用 Error on log cat reads
android.database.sqlite.SQLiteException: near "TABLEUSER":
syntax error (code 1): , while compiling:
CREATE TABLEUSER(COLUMNUIDINTEGER PRIMARY KEY AUTOINCREMENT,COLUMN_USERNAMETEXT,
COLUMN_EMAILTEXT,FOREIGN KEY(COLUMNUID) REFERENCES TABLESESSIONS(COLUMNSESSIONUID))
Class is like this
package databasepackage;
/**
* Importing the context functionality
*/
import android.content.ContentValues;
import android.content.Context;
/**
* Importing functionality of SQLite database
*/
import android.database.sqlite.SQLiteDatabase;
/**
* Importing functionality of cursor
*/
//import android.database.sqlite.SQLiteDatabase.CursorFactory;
/**
* Importing the SQlite open helper class
*/
import android.database.sqlite.SQLiteOpenHelper;
/**
* Importing the functionality to allow a log to see if database has been changed/upgraded
*/
import android.util.Log;
/**
* class to allow database to access tables
*
* @author James
*
*/
public class DatabaseHelper extends SQLiteOpenHelper {
/**
* Tag to allow us to see when database has been upgraded
*/
public static final String TAG = "DatabaseHelper";
/**
* columns of table user
*
*/
public static final String TABLEUSER = "USER";
public static final String COLUMNUID = "COLUMNUID";
public static final String COLUMNUSERNAME = "COLUMN_USERNAME";
public static final String COLUMNEMAIL="COLUMN_EMAIL";
/**
* columns of table sessions
*/
public static final String TABLESESSIONS = "sessions";
public static final String COLUMNSID = "sid";
public static final String COLUMNSESSIONUID = "sessionuid";
public static final String COLUMNSESSIONDATE = "sessiondate";
/**
* columns of table session questions
*/
public static final String TABLESESSIONQUESTION = "sessionquestion";
public static final String COLUMNSESSIONQUESTIONQID = "sessionquestionqid";
public static final String COLUMNSESSIONQUESTIONSID = "sessionquestionsid";
/**
* columns of table question
*/
public static final String TABLEQUESTION = "question";
public static final String COLUMNQUESTIONQID = "questionqid";
public static final String COLUMNQUESTIONSID = "sessionid";
public static final String COLUMNQTEXT = "qtext";
/**
* columns of table text entry
*/
public static final String TABLETEXTENTRY = "textentry";
public static final String COLUMNTEXTENTRYQID = "textentryqid";
public static final String COLUMNTEXTENTRYSID = "textentrysid";
public static final String COLUMNTEXTENTRYQTEXT = "textentryqtext";
public static final String COLUMNBLANKOPTION = "blankoption";
/**
* columns of table multichoice
*/
public static final String TABLEMULTICHOICE = "multichoice";
public static final String COLUMNMULTICHOICEQID = "multichoiceqid";
public static final String COLUMNMULTICHOICESID = "multichoicesid";
public static final String COLUMNMULTICHOICEQTEXT = "multichoiceqtext";
public static final String COLUMNMULTICHOICEOPTA = "multichoiceopta";
public static final String COLUMNMULTICHOICEOPTB = "multichoiceoptb";
public static final String COLUMNMULTICHOICEOPTC = "multichoiceoptc";
public static final String COLUMNMULTICHOICEOPTD = "multichoiceoptd";
/**
* columns of table answer
*/
public static final String TABLEANSWER = "answer";
public static final String COLUMNAID = "aid";
public static final String COLUMNANSWERQID = "answerqid";
public static final String COLUMNANSWERTEXT = "answertext";
public static final String COLUMNISCORRECT = "iscorrect";
/**
* creating the database name
*/
public static final String DATABASE_NAME = "project.db";
/**
* setting the database version
*/
public static final int DATABASE_VERSION = 34;
/**
* SQL statement of the user table creation
*
*/
public static final String SQLCREATETABLEUSER = "CREATE TABLE"
+ TABLEUSER
+ "("
+ COLUMNUID
+ "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ COLUMNUSERNAME
+ "TEXT,"
+ COLUMNEMAIL
+ "TEXT,"
+ "FOREIGN KEY(COLUMNUID) REFERENCES TABLESESSIONS(COLUMNSESSIONUID)"
+ ")";
/**
* SQL statment of the sessions table creation
*/
public static final String SQLCREATETABLESESSIONS = "CREATE TABLE"
+ TABLESESSIONS
+ "("
+ COLUMNSID
+ "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ COLUMNSESSIONUID
+ "INTEGER PRIMARY KEY,"
+ COLUMNSESSIONDATE
+ "REAL,"
+ "FOREIGN KEY (COLUMNSID) REFERENCES TABLESESSIONQUESTION(COLUMNSESSIONQUESTIONSID)"
+ ")";
/**
* SQL statement of the sessionquestion table
*/
public static final String SQLCREATETABLESESSIONQUESTION = "CREATE TABLE"
+ TABLESESSIONQUESTION
+ "("
+ COLUMNSESSIONQUESTIONQID
+ "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ COLUMNSESSIONQUESTIONSID
+ "INTEGER NOT NULL,"
+ "FOREIGN KEY (COLUMNSESSIONQUESTIONQID) REFERENCES TABLEQUESTION (COLUMNQUESTIONQID)"
+ ")";
/**
* SQL statement of the question table
*/
public static final String SQLCREATETABLEQUESTION = "CREATE TABLE"
+ TABLEQUESTION
+ "("
+ COLUMNQUESTIONQID
+ "INTEGER PRIMARY KEY AUTOINCREMENT,"
+ COLUMNQUESTIONSID
+ "INTEGER PRIMARY KEY,"
+ COLUMNQTEXT
+ "TEXT NOT NULL,"
+ "FOREIGN KEY(COLUMNQUESTIONQID) REFERENCES TABLETEXTENTRY (COLUMNTEXTENTRYQID),"
+ "FOREIGN_KEY(COLUMNQUESTIONSID) REFERENCES TABLE_MULTICHOICE (COLUMNMULTICHOICESID)"
+ ")";
/**
* SQL statement of the text entry table
*/
public static final String SQLCREATETABLETEXTENTRY = "CREATE TABLE"
+ TABLETEXTENTRY
+ "("
+ COLUMNTEXTENTRYQID
+ "INTEGER PRIMARY KEY,"
+ COLUMNTEXTENTRYSID
+ "INTEGER PRIMARY KEY,"
+ COLUMNTEXTENTRYQTEXT
+ "TEXT NOT NULL,"
+ COLUMNBLANKOPTION
+ "TEXT NOT NULL,"
+ "FOREIGN KEY(COLUMNTEXTENTRYQID) REFERENCES TABLE_ANSWER (COLUMNANSWERQID)"
+ ")";
/**
* SQL statement of the multichoice table
*/
public static final String SQLCREATETABLEMULTICHOICE = "CREATE TABLE"
+ TABLEMULTICHOICE
+ "("
+ COLUMNMULTICHOICEQID
+ "INTEGER PRIMARY KEY,"
+ COLUMNMULTICHOICESID
+ "INTEGER PRIMARY KEY,"
+ COLUMNMULTICHOICEQTEXT
+ "TEXT NOT NULL,"
+ COLUMNMULTICHOICEOPTA
+ "TEXT NOT NULL,"
+ COLUMNMULTICHOICEOPTB
+ "TEXT NOT NULL,"
+ COLUMNMULTICHOICEOPTC
+ "TEXT NOT NULL,"
+ COLUMNMULTICHOICEOPTD
+ "TEXT NOT NULL,"
+ "FOREIGN KEY(COLUMNMULTICHOICEQID) REFERENCES TABLEANSWER (COLUMNANSWERQID)"
+ ")";
/**
* SQL statement of the answer table
*/
public static final String SQLCREATETABLEANSWER = "CREATE TABLE"
+ TABLEANSWER + "(" + COLUMNAID + "INTEGER PRIMARY KEY,"
+ COLUMNANSWERQID + "INTEGER PRIMARY KEY," + COLUMNANSWERTEXT
+ "TEXT NOT NULL," + COLUMNISCORRECT + "INTEGER" + ")";
/**
* constructor of the database helper class
*
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
/**
* creating/executing the tables using the SQL statement
*/
public void onCreate(SQLiteDatabase db) {
db.execSQL(SQLCREATETABLEUSER);
db.execSQL(SQLCREATETABLESESSIONS);
db.execSQL(SQLCREATETABLESESSIONQUESTION);
db.execSQL(SQLCREATETABLEQUESTION);
db.execSQL(SQLCREATETABLETEXTENTRY);
db.execSQL(SQLCREATETABLEMULTICHOICE);
db.execSQL(SQLCREATETABLEANSWER);
}
/**
* Method to allow us to upgrade the table
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "UPGRADING THE DATABSE FROM VERSION" + oldVersion + " to"
+ newVersion);
//db.execSQL("ALTER TABLE" + TABLE_USER + DATABASE_NAME + " ADD COLUMN_EMAIL TEXT");
// clear all data
//db.execSQL("DROP TABLE IF EXISTS" + TABLE_USER);
db.execSQL("DROP TABLE IF EXISTS" + TABLESESSIONS);
db.execSQL("DROP TABLE IF EXISTS" + TABLESESSIONQUESTION);
db.execSQL("DROP TABLE IF EXISTS" + TABLEQUESTION);
db.execSQL("DROP TABLE IF EXISTS" + TABLETEXTENTRY);
db.execSQL("DROP TABLE IF EXISTS" + TABLEMULTICHOICE);
db.execSQL("DROP TABLE IF EXISTS" + TABLEANSWER);
// recreate the tables
onCreate(db);
}/**
Method to allow users to insert data into users table
*
**/
public boolean insertData(String username,String email) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMNUID,COLUMNUID);
contentValues.put(COLUMNUSERNAME,COLUMNUSERNAME);
contentValues.put(COLUMNEMAIL,COLUMNEMAIL);
long result = db.insert(TABLEUSER,null ,contentValues);
if(result == -1)
return false;
else
return true;
}
/**
* constructor of the database helper class
*
* @param context
* @param name
* @param factory
* @param version
*/
public DatabaseHelper(Context context, String name,
int version) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
}
，记录here。
dangerouslySetInnerHTML还讨论了here。