The IDalCommandParam interface contains properties of parameters of the SQL queries used to execute the command on the database server.
| Property name | Brief description | |
| DataDomain | The DataDomain property determines the parameter data type if the parameter is used to transmit multibyte information. | |
| DataType | The DataType property determines a data type of the SQL query parameter. | |
| Direction | The Direction property determines a destination of the SQL query parameter. | |
| Name | The Name property returns a name of the SQL query parameter that is used to execute the command on the database server. | |
| Size | The Size property determines maximal length of the value that parameter can take. | |
| Value | The Value property determines a value of the SQL query parameter, that is used to execute the command on the database server. |
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