sqlite 内存数据库的attach

概述sqlite3_open(":memory:", &db); ... ret = sqlite3_exec(db, "CREATE TABLE new_table1 (id integer primary key autoincrement,name vchar(32))", 0, 0, &zErrMsg); ret = sqlite3_exec(db,"begin transaction",0,

sqlite3_open(":memory:",&db);
...
ret = sqlite3_exec(db,"CREATE table new_table1 (ID integer primary key autoincrement,name vchar(32))",&zErrMsg);

ret = sqlite3_exec(db,"begin transaction","insert into new_table1 (name) values ('123');","commit transaction",&zErrMsg);



sqlite3_open("c:/A.dat",&db);
ret = sqlite3_exec(db,"attach 'c:/A.dat' as new_db","insert into new_db.new_table2 (name) select name from new_table1",&zErrMsg);

if (ret!=sqlITE_OK)
MessageBox("附加数据库失败！");

300万条内存数据,10个字段,大概写入了631MB物理文件

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