dbExecuteCommand()

Database function for executing a database manipulation command.

Synopsis

int dbExecuteCommand( dbCommand command[, dbRecordset rs]);

Parameters

Parameter Meaning
command Command reference provided by dbStartCommand().
rs

Optional recordset parameter as names/values pair which was set with dbSetParameter(). It allows executing queries which require so-called bind parameters.

Note: If this parameter is used, it must be closed explicitly in the script (see example 2 below).

Return Value

The return value is an error code; 0 indicates the operation has been performed successfully. For other values dbGetError() can be used to obtain detailed error information.

Errors

An error is returned if an invalid command reference is passed, or for commands that are not permitted (passed with dbStartCommand()).

Description

dbExecuteCommand() executes a command object previously created with dbStartCommand(). Repeated execution of one and the same command object (without repeated dbStartCommand()) is supported. In addition, so-called bind parameters can be passed to the command execution in the optional parameter rs. These must be set before with dbSetParameter().

Bind parameters cannot be used to edit zero values (insert / update / delete)!

Example 1

See dbBeginTransaction()

Example 2

#uses "ctrlADO.dll"

main()

{ 

 string sConnectString;
 dbConnection dbConn;
 dbCommand dbCmd;
 dyn_string ds;
 int rc = 0;

DebugN("SetParamTest");

 sConnectString =
                                    "DSN=eisux077_db11g;UID=owokl;PWD=std;InputStringLimit=16384;";
 DebugN("Open ", sConnectString);
if (dbOpenConnection(sConnectString, dbConn) == 0 && 
dbBeginTransaction(dbConn) == 0)

{ 

 dbRecordset rs, rs2;

anytype fld;

string sql = "SELECT a FROM ado_test WHERE B = :1 OR B = :2";

rc = dbStartCommand(dbConn, sql, dbCmd);

rc = dbSetParameter(dbCmd, 2, DB_PARAM_IN, 255);

rc = dbSetParameter(dbCmd, 1, DB_PARAM_IN, 23);

rc = dbExecuteCommand(dbCmd, rs2);

while(!rc && !dbEOF rs2)) // As long as end of file not reached

{

rc = dbGetField(rs2, 0, fld); // Current column

DebugN("out(1): ", fld);

rc = dbMoveNext(rs2);// Go to next record set

}

dbCloseRecordset(rs2);// Close subset

// Change parameters

rc = dbSetParameter(dbCmd, 1, DB_PARAM_IN, 47);

rc = dbSetParameter(dbCmd, 2, DB_PARAM_IN, 255);

rc = dbExecuteCommand(dbCmd, rs);

while (!rc && !dbEOF (rs))

{

rc = dbGetField(rs, 0, fld);// Current column

DebugN("out(2): ", fld );

rc = dbMoveNext(rs);// Go to next record set

}

dbCloseRecordset(rs); // Close subset

DebugN("test complete, committing and closing database connection");

dbCommitTransaction(dbConn);

dbCloseConnection(dbConn);

}

exit(0);

}

Assignment

ADO and Qt, Database functions

Availability

CTRL