cybertxt / xsqlite

sqlite orm for c++

xsqlite

sqlite c++ orm

Usage:

xsqlite.exe prefix xsqlitefile
xsqlite.exe test ./Test/db.xsqlite

DSL:

table tablename
{
   type:field1+label1+label2;
   type:field2+label1+label2;
}

sql queryname
{
   in:table1.field1,table2,field2;
   out:table1.field3,table2.field4,;
   exp:"querystatement";
}

label primary key:

add +p in the field's label region

default generate API：

• insert record: InsertXXX
• find all records in table: BeginFindXXX MoveNextXXX EndFindXXX
• find records in table by primary key: BeginFindXXX MoveNextXXX EndFindXXX
• remove records in table by primary key: RemoveXXX

label simple search query in table：

assume we have the following simple query in table.

"select field3,field4 from table where field1=1? and field2=2?" 

take the search quey an id i(1,2,...), we can label the query by：

• label field1 and field2 with +ski
• leble field3 and field3 with +svi

which will then generate correspod c++ query functions: BeginFindXXX,MoveNextXXX,EndFindXXX, where XXX is the table name.

for example:

// "select file_d from DataBlock where hash=1?"
table DataBlock
{
   bytes:hash+p+sk1;
   i32:file_id+sv1;
   i64:create_time;
   i64:time_to_live;
   i32:length;
   i32:range_count;
}

label simple delete query in table

assume we have the following simple query in table.

"delete from table where field1=1? and field2=2?"

take the delete quey an id i(1,2,...), we can label the query by：

• label field1 and field2 with +ri

which will then generate correspod c++ query functions: RemoveXXX, where XXX is the table name.

for example:

// "delete from table where hash=1? and pos=2?"
table DataRange
{
   bytes:hash+p+r1;
   i32:seq+p;
   i32:file_id;
   i64:posr1;
   i32:length;
}

label simple update query in table:

assume we have the following simple query in table.

"update table set field1=3? and field4=4? where field1=1? and field2=2? " 

take the update quey an id i(1,2,...), we can label the query by：

• label field1 and field2 with +uki
• label field3 and field4 with +uvi which will then generate correspod c++ query functions: UpdateXXX, where XXX is the table name.

for example:

// "update table set last_scan_time=2? where file_id=1?"
table File
{
   i32:file_id+p+uk1;
   bytes:path;
   bytes:hash;
   i64:create_time;
   i64:last_scan_time+uv1;
   i32:flag+uv1;
}

other query statements：

otherwise, you can declare sql by the following statements, which is more clear and easy.

sql FindEarlestDataBlock
{
  in:DataBlock.length;
  out:DataBlock.hash,DataBlock.file_id,DataBlock.create_time;
  exp:"SELECT hash, file_id, min(create_time) FROM DataBlock WHERE length<=1?";
}

sql FetchDataBlockStoreInfo
{
  out:DataBlock.hash,DataBlock.file_id,File.path;
  exp:"SELECT DataBlock.hash, DataBlock.file_id, File.path FROM DataBlock, File WHERE Datablock.hash=File.hash";
}