NEW DBI API (MySQL SQL).txt

This is very important for scripters! For AMXx 0.20, I have significantly changed the SQL interface. All plugins will be rendered broken, so you will need to upgrade.

If you need any help with this, just ask. I can help you convert your plugin or answer technical questions. Remember though, this is for 0.20 and you should be prepared to swap in the new code close to the release date (we will announce this).

This new DBI is important because it gets rid of the shoddy interface from AMX 0.9.x. Plugin writers now get resource handles for both result sets and connections, as well as a better guarantee that the driver will not crash.

To best explain this, here is a sample program:

Code:
//Create a connection
    new Sql:mysql = dbi_connect("localhost", "dvander", "pass", "dbase")

//If the connection is less than 1, it is bad   
    if (mysql < SQL_OK) {
        new err[255]
        new errNum = dbi_error(mysql, err, 254)
        server_print("error1: %s|%d", err, errNum)
        return 1
    }
    
    server_print("Connection handle: %d", mysql)
//Run a query
    new Result:ret = dbi_query(mysql, "INSERT INTO config (keyname, val) VALUES ('amx', 'yes')")

//If the query is less than 0, it failed    
    if (ret < RESULT_NONE) {
        new err[255]
        new errNum = dbi_error(mysql, err, 254)
        server_print("error2: %s|%d", err, errNum)
        return 1
    }

//Do a select query 
    new Result:res = dbi_query(mysql, "SELECT * FROM config")

//If the query is greater than 0, you got a handle to the result set    
    if (res <= RESULT_NONE) {
        new err[255]
        new errNum = dbi_error(mysql, err, 254)
        server_print("error3: %s|%d", err, errNum)
        return 1
    }
    
    server_print("Result handle: %d", res)

//Loop through the result set   
    while (res && dbi_nextrow(res)>0) {
        new qry[32]
//Get the column/field called "keyname" from the result set
        dbi_result(res, "keyname", qry, 32)
        server_print("result: %s", qry)
    }

//Free the result set   
    dbi_free_result(res)

//Close the connection  
    ret = dbi_close(mysql)
    if (ret <= RESULT_NONE) {
        new err[255]
        new errNum = dbi_error(mysql, err, 254)
        server_print("error4: %s|%d", err, errNum)
        return 1
    }

These differences are subtle and important. It means you can create nested or recursive SQL queries and not have the previous ones erased. It also gives you much better errorchecking/debugging control. You can also reference fields by name instead of number.