Question

我在Android Sqlite中创建Table时尝试使用INTEGER AUTOINCREMENT。但它显示错误。但它在使用INTEGER PRIMARY KEY AUTOINCREMENT时工作正常。

我的要求是，带有AUTOINCREMENT的列不应该是主键。

db.execSQL("CREATE TABLE " + Table_KOT_ITEMS_TEMP + "(" + col_Item_Name
                + " varchar(40) NOT NULL," + col_Ref_No
                + " int(11) NOT NULL DEFAULT '0'," + col_Table_No
                + " varchar(6) NOT NULL DEFAULT '0'," + col_Kot_No
                + " int(11) NOT NULL DEFAULT '0'," + col_Main_Item_Code
                + " varchar(10) NOT NULL," + col_Item_Type
                + " varchar(10) NOT NULL," + col_Item_Amount
                + " decimal(10,2) DEFAULT '0.00'," + col_Item_Qty
                + " decimal(9,3) NOT NULL DEFAULT '0.000'," + col_No_Of_Persons
                + " varchar(6) NOT NULL," + col_Dum_Unique
                + " varchar(25) NOT NULL," + col_CheckBox
                + " char(5) NOT NULL," + col_Item_Auto_ID
                + " INTEGER PRIMARY KEY AUTOINCREMENT)");

Answer 1

不直接。但是你可以创建一个触发器来实现这一点。

 -- Create table
 CREATE TABLE testtbl (
     id INTEGER PRIMARY KEY,
     autoincr DEFAULT NULL,
     otherrow TEXT -- and maybe more
 );
 -- Create helper table
 CREATE TABLE sequence_helper (
     name TEXT PRIMARY KEY COLLATE NOCASE,
     seq INTEGER DEFAULT 1
 );
 -- Fill in the starting number
 INSERT INTO sequence_helper VALUES ('testtbl', 1);
 -- Create the trigger
 CREATE TRIGGER autoincr_testtbl AFTER INSERT ON testtbl FOR EACH ROW BEGIN
     UPDATE testtbl SET 
         autoincr = (SELECT seq FROM sequence_helper WHERE name = 'testtbl')
         WHERE rowid = new.rowid;
     UPDATE sequence_helper SET seq = seq+1 WHERE name = 'testtbl';
 END;

您可以通过检查autoincr列是否为NULL来改进这一点，但您应该了解基本想法。

Answer 2

在SQLite中，AUTOINCREMENT列must be declared as INTEGER PRIMARY KEY。

Answer 3

是的，实现这一点非常困难，唯一的选择是将其作为INTEGER PRIMARY KEY AUTOINCREMENT ......

是否可以在不将其设置为主要密钥的情况下使用AUTO INCREMENT在ANDROID SQLite中

3 个答案: