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error 404 revExecuteSQL | revDocs | RunRev
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Product Edition
Version
revExecuteSQL
Basics
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Type
Command
Syntax

revExecuteSQL databaseID,SQLStatement [,{variablesList | arrayName}]

Introduced
2.0
Changed
2.9
Environment
Desktop, Web and Server
Platform Support
MacOS,Mac OS X,Windows,Linux
Security
Disk,Network
Summary
Executes a SQL statement on a database.
Examples

revExecuteSQL myDatabaseID, the text of field "Query", "*bMyVar"
revExecuteSQL 12, builtQuery, "someArray"

Additional Comments
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Use the revExecuteSQL command to execute a SQL query without selecting records.

Parameters:

The databaseID is the number returned by the revOpenDatabase function when the database was opened.

The SQLStatement is a string in Structured Query Language. (Do not include a semicolon at the end of the SQLStatement.)

Note: Some database systems, such as Oracle, are capable of handling a multiple-line SQL statement.

The variablesList consists of one or more variable names (or expressions that evaluate to variable names), separated by commas. Each variable name may also be the name of an array element, for example "tInputData[id]".

The arrayName is the name of a single array variable whose keys are sequential numbers.

Note: The variable names or arrayName must be enclosed in quotes; otherwise, the variable's value rather than its name is passed to the revExecuteSQL command.

Value

The revExecuteSQL command places a return value into the result, to indicate the outcome of the query.

For successful queries, the revExecuteSQL command returns the number of rows affected for INSERT, UPDATE and DELETE statements. For all other statements, 0 is returned.

For unsuccessful queries, an error string is returned, describing the problem.

Comments:

The SQLStatement may contain one or more placeholders, which are sequential numbers prepended by a colon. The revExecuteSQL command substitutes the corresponding item in the variablesList for each of these placeholders. For example, if you have two variables called "valueX" and "valueY", you can use a SQLStatement that includes placeholders as follows:

revExecuteSQL myID, "insert into mytable values(:1,:2,:1)", "valueX","valueY"

The content of the variable valueX is substituted for the ":1" in the SQLQuery (in both places where ":1" appears), and the content of valueY is substituted for ":2".

Note that placeholders can currently only represent data values in the query. The following line for example is incorrect and will cause a syntax error to be returned by the database because a placeholder is being used to represent a column name (:1).

-- Invalid, will cause SQL syntax error

revExecuteSQL myID, "insert into mytable(:1, name, date) values (:2, :3, :2)", "tColumnName", "tValueX", "tValueY"

If you specify an arrayName rather than a list of ordinary variables, the revExecuteSQL command substitutes the corresponding element of the array for each of the placeholders in the query:

revExecuteSQL myID,"insert into mytable values(:1,:2,:1)","myArray"

The content of the element myArray[1] is substituted for the ":1" in the SQLQuery (in both places where ":1" appears), and the content of myArray[2] is substituted for ":2".

To pass binary data in a variable in the variablesList, prepend "*b" to the variable name. The revExecuteSQL command strips the binary marker "*b" and passes it to the database as binary data, rather than text data.

To pass binary data in an array element, prepend "*b" to the element's key.

Important! The revExecuteSQL command is part of the Database library. To ensure that the function works in a standalone application, you must include this custom library when you create your standalone. In the Inclusions section of the General screen of the Standalone Application Settings window, make sure the "Database Support" checkbox is checked and the database drivers you are using are selected in the list of database drivers.

Changes to Revolution

The ability to specify array elements in the variablesList was added in 2.9

User Comments
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