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我有两个表:Android上的SQLite查询?
CREATE TABLE APTable (id_Ap INTEGER PRIMARY KEY AUTOINCREMENT,
SSID TEXT,
BSSID TEXT,
Id_APtest INTEGER NOT NULL,
FOREIGN KEY (Id_APtest) REFERENCES Tests (id_test) ON DELETE CASCADE)
CREATE TABLE APmeasure (id_APmeasure INTEGER PRIMARY KEY AUTOINCREMENT,
RSSI TEXT,
TimeOfMeasure DATETIME,
BSSID TEXT,
id_APm INTEGER NOT NULL,
FOREIGN KEY (id_APm) REFERENCES APTable (id_Ap) ON DELETE CASCADE)
我想检查是否存在APTable
其中BSSID = x
和id_Aptest=y
一个id_Ap
,并返回id_Ap
值。
我该如何在Android API查询中做到这一点?