这段代码没有创建第二个表请帮帮我......它创建了第一个表。只发布第二个...... 我在xamarin.android工作 我认为它已经创建了一个带有一个表的数据库，所以我卸载了我的应用程序并尝试了仍然没有更改.. 公共数据库（） {
}
public Database(string sqldb_name)
{
try
{
CreateDatabase(sqldb_name);
}
catch (SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
//Gets or sets value depending on database availability
public bool DatabaseAvailable
{
get{ return sqldb_available; }
set{ sqldb_available = value; }
}
//Gets or sets the value for message handling
public string Message
{
get{ return sqldb_message; }
set{ sqldb_message = value; }
}
//Creates a new database which name is given by the parameter
public void CreateDatabase(string sqldb_name)
{
try
{
sqldb_message = "";
string sqldb_location = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
string sqldb_path = Path.Combine(sqldb_location, sqldb_name);
bool sqldb_exists = File.Exists(sqldb_path);
if(!sqldb_exists)
{
sqldb = SQLiteDatabase.OpenOrCreateDatabase(sqldb_path,null);
sqldb_query = sqldb_query = "CREATE TABLE IF NOT EXISTS MyTable(_id INTEGER PRIMARY KEY AUTOINCREMENT,date DATETIME DEFAULT CURRENT_TIMESTAMP, Value INTEGER);";
sqldb.ExecSQL(sqldb_query);
sqldb_query = "CREATE TABLE IF NOT EXISTS MyMonth(_id INTEGER PRIMARY KEY AUTOINCREMENT, Month VARCHAR, per INTEGER);";
sqldb.ExecSQL(sqldb_query);
}
else
{
sqldb = SQLiteDatabase.OpenDatabase(sqldb_path, null, DatabaseOpenFlags.OpenReadwrite);
sqldb_message = "Database: " + sqldb_name + " opened";
}
sqldb_available=true;
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
//Adds a new record with the given parameters
public void AddRecord(int svalue)
{
try
{
sqldb_query = "INSERT INTO MyTable(date, Value) VALUES (date() ," + svalue + ");";
sqldb.ExecSQL(sqldb_query);
sqldb_message = "Record saved";
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
public void AddRecordPer()
{
try
{
sqldb_query="INSERT INTO MyMonth(_id,Month,Per) VALUES(1,JAN,10);";
sqldb.ExecSQL(sqldb_query);
sqldb_message = "Record saved";
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
public Android.Database.ICursor GetRecordCursor()
{
Android.Database.ICursor sqldb_cursor = null;
try
{
sqldb_cursor = sqldb.RawQuery("SELECT * FROM MyTable ", null);
if(!(sqldb_cursor != null))
{
sqldb_message =`enter code here` "Record not found";
}
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
return sqldb_cursor;
}
public Android.Database.ICursor GetRecordCursor1()
{
Android.Database.ICursor sqldb_cursor = null;
try
{
sqldb_cursor = sqldb.RawQuery("SELECT * FROM MyMonth", null);
if(!(sqldb_cursor != null))
{
sqldb_message = "Record not found";
}
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
return sqldb_cursor;
}
}
}