如何找到列的SQLite数据库

Question

public Cursor getBiggestInTheColumn() 
{ 
    return db.query(HEADER_TABLE, null,"MAX(key_Division)", null, null, null, null); 
} 

最大值和我称这种方法为Cursor cc=db.getBiggestInTheColumn();

但它强行关闭application.Please帮我

Answer 1

public int getBiggestInTheColumn() 
{ 
    Cursor c = db.query(HEADER_TABLE, null,new String[] {"MAX(key_Division)"}, null, null, null, null); 
    try { 
     c.moveToFirst(); 
     return c.getInt(0); 
    } finally { 
     c.close(); 
    } 
} 

Answer 2

您可以使用simpleQueryForLong并相应地施放它。

public int getMaxColumnData() { 

    mDb = mDbManager.getReadableDatabase(); 
    final SQLiteStatement stmt = mDb 
      .compileStatement("SELECT MAX(column) FROM Table"); 

    return (int) stmt.simpleQueryForLong(); 
}