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Transctions support draft #4

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Transctions support draft #4

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d91aed5
Add draft transactions support
SevDan Jan 10, 2021
c19dbeb
#3 Add multiconnections support
SevDan Jan 10, 2021
852a26a
Update README.md
SevDan Jan 10, 2021
8a448bd
Fix wrong opened transaction safety closing
SevDan Jan 10, 2021
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41 changes: 41 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -73,3 +73,44 @@ local conn,err = pg_conn("postgresql://user:[email protected]:5432/mydb?connect_ti
...
pg_close(conn);
```
## bool pg_tx_begin(userdata connection);
Begin new transaction for current connection (cannot create subtransaction)

**return** boolean
```lua
local conn,err = pg_conn("postgresql://user:[email protected]:5432/mydb?connect_timeout=3");
...
pg_tx_begin(conn);
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a man", "mypasswd", "13");
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a woman", "somepass", "44");
pg_tx_commit(conn);
```
## bool pg_tx_commit(userdata connection);
Commit transaction for current connection

**return** boolean
```lua
local conn,err = pg_conn("postgresql://user:[email protected]:5432/mydb?connect_timeout=3");
...
pg_tx_begin(conn);
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a man", "mypasswd", "13");
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a woman", "somepass", "44");
pg_tx_commit(conn);
```
## bool pg_tx_rollback(userdata connection);
Rollback transaction for current connection

**return** boolean
```lua
local conn,err = pg_conn("postgresql://user:[email protected]:5432/mydb?connect_timeout=3");
...
pg_tx_begin(conn);
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a man", "mypasswd", "13");
local exec = pg_exec(conn, "INSERT INTO users (name, password, money) VALUES ($1,$2,$3)", "a woman", "somepass", "44");
if (<state validation condition>) then
pg_tx_commit(conn);
else
pg_tx_rollback(conn);
end
```

9 changes: 7 additions & 2 deletions include/CFunctions.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,9 @@
*
* ml_base, External lua add-on module
*
* Copyright � 2003-2008 MTA. All Rights Reserved.
* Copyright � 2003-2008 MTA. All Rights Reserved.
*
* Grand Theft Auto is � 2002-2003 Rockstar North
* Grand Theft Auto is � 2002-2003 Rockstar North
*
* THE FOLLOWING SOURCES ARE PART OF THE MULTI THEFT
* AUTO SOFTWARE DEVELOPMENT KIT AND ARE RELEASED AS
Expand All @@ -33,6 +33,11 @@ extern ILuaModuleManager10 *pModuleManager;
class CFunctions
{
public:
// transaction functions
static int pg_tx_begin(lua_State* luaVM);
static int pg_tx_rollback(lua_State* luaVM);
static int pg_tx_commit(lua_State* luaVM);

static int pg_conn(lua_State* luaVM);
static int pg_query(lua_State* luaVM);
static int pg_poll(lua_State* luaVM);
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