How Can I Pass R Variables to SQL Queries Using RODBC's sqlQuery?

Passing Variables to RODBC's sqlQuery

Introduction

The RODBC package provides an interface to database connections in R, facilitating the execution of SQL queries. Users often encounter the need to pass variables defined within R to these queries. This article addresses this topic, discussing how to pass R variables to scalar/table-valued functions, stored procedures, and WHERE clauses in SQL queries using the sqlQuery function.

Solution

To pass an R variable to a sqlQuery, build the query string with the variable substituted. For instance, instead of:

example <- sqlQuery(myDB, "SELECT * FROM dbo.my_table_fn (x)")

Do:

example <- sqlQuery(myDB, paste("SELECT * FROM dbo.my_table_fn (", 
                                x, ")", sep=""))

This will fill in the value of x in the query string.

Additional Considerations

• This method works for passing variables to scalar/table-valued functions, stored procedures, and WHERE clauses.
• The paste() function is used to concatenate the query string with the variable value.
• Ensure that the variable name matches the parameter or argument expected by the SQL function or stored procedure.

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