Android 数据库的Cursor封装，简化操作

最新推荐文章于 2025-01-10 09:16:42 发布

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本文介绍了一个用于简化Cursor操作的CursorHelper类，该类提供了一系列方法来获取不同类型的数据，如整数、浮点数、字符串等，并包括了游标切换、移动和关闭等功能。

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不喜欢写注释因为较简单?

public class CursorHelper {
    private Cursor mCursor = null;

    public CursorHelper(Cursor cursor) {
        this.mCursor = cursor;
    }

    public CursorHelper() {
    }

    public static CursorHelper from(@NonNull Cursor cursor) {
        return new CursorHelper(cursor);
    }

    public void swapCursor(Cursor cursor) {
        this.mCursor = cursor;
    }

    public boolean getBoolean(String columnName) {
        return this.mCursor.getInt(this.mCursor.getColumnIndexOrThrow(columnName)) != 0;
    }

    public float getFloat(String columnName) {
        return this.mCursor.getFloat(this.mCursor.getColumnIndexOrThrow(columnName));
    }

    public int getInt(String columnName) {
        return this.mCursor.getInt(this.mCursor.getColumnIndexOrThrow(columnName));
    }

    public double getDouble(String columnName) {
        return this.mCursor.getDouble(this.mCursor.getColumnIndexOrThrow(columnName));
    }

    public long getLong(String columnName) {
        return this.mCursor.getLong(this.mCursor.getColumnIndexOrThrow(columnName));
    }

    public String getString(String columnName) {
        return this.mCursor.getString(this.mCursor.getColumnIndexOrThrow(columnName));
    }

    public boolean moveToNext() {
        return this.mCursor != null && this.mCursor.moveToNext();
    }

    public void close() {
        if (mCursor != null && !mCursor.isClosed()) {
            this.mCursor.close();
            mCursor = null;
        }
    }
}