Question

我使用sqlite.NET（c＃）当我执行这个陈述时

"SELECT id, date, team1, team2, finalScore, winner FROM matches WHERE team1 = @team OR team2 = @team AND date BETWEEN @fromDate AND @toDate ORDER BY date DESC"

忽略"team2 = @team"，仅选择"team1 = @team"。如果我删除"OR team2 = @team"而不是返回查询是空的，而它不应该。如果我将"team1 = @team OR team2 = @team"放入括号中，则返回空查询

这里是所有代码

public System.Data.DataTable searchMatches(string team, string fromDate, string toDate)
{
    SQLiteCommand cm = new SQLiteCommand("SELECT id, date, team1, team2, finalScore, winner FROM matches WHERE team1 = @team OR team2 = @team AND date BETWEEN @fromDate AND @toDate ORDER BY date DESC", cnlite);
    cm.Parameters.AddWithValue("@team", team);
    cm.Parameters.AddWithValue("@fromDate", fromDate);
    cm.Parameters.AddWithValue("@toDate", toDate);
    SQLiteDataAdapter sda = new SQLiteDataAdapter(cm);

    System.Data.DataTable table = new System.Data.DataTable();
    sda.Fill(table);
    return table;
}
DataTable matches = db.searchMatches(sheetDataXlsx.Rows[i]["Ομαδα 1"].ToString(), matchDate.ToString("yyyy/MM/dd"),
                                                    matchDate.AddDays(-90).ToString("yyyy/MM/dd"));

PS日期是一个字符串（＆＃34; yyyy / MM / dd＆＃34;）

Answer 1

如documentation中所述，AND的优先级高于OR。所以你的查询相当于：

SELECT ... WHERE team1 = ? OR (team2 = ? AND date BETWEEN ...) ...

您必须手动添加括号以强制执行正确的评估顺序。

sqlite选择尴尬的行为

1 个答案: