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Macros that have values specific for different databases providers. Collections of macros are organized into UniMacroCollection , which can be accessed through Macros property of UniConnection. Now suppose we need to do the same on an Oracle server. Set of automatically mapped functions. Evaluates to database type that represents date and time values.

unisql

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Macro is a set of name, condition and value. Conditions are enabled or disabled depending on DBMS server the UniConnection is connected to, and data provider used.

The following example adds two years to HireDate field: Its usage is similar to usage of macros. Supposed that in this sample connection is made to MySQL server, the executed statement would be. Oracle – because Oracle server is used.

In run time the function is transformed either to corresponding native function, or to equivalent expression for example, several functions. Now let’s take a look at another example that demonstrates a whole pack of important features:.

Use two intervals instead, or express it in smaller units. Unless entered directly by the user, the statements can be constructed in one of two ways, either hard-coded during development, or constructed at run time.

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Now suppose we need to do the same on an Oracle server. This is set uhisql function names with fixed meaning. This article demonstrates how dotConnect Universal helps to overcome this issue.

Encyclopedia

Unified standard of literals. Used mainly in CAST expressions.

unisql

For example, if you connect to Oracle server using dotConnect for Oracle, the following conditions will be enabled:. In addition to predefined macros you can define your own. For list of available conditions in other words, predefined macros refer to the Macros Reference.

unisql

Set of automatically mapped functions. Show response Finally conn.

There are also predefined macros that help to solve most common differences unlsql SQL syntax. Returns a new datetime value based on adding an interval to the specified date.

The following example demonstrates the rule:. The first statement adds 4 days to selected field; the second statement adds 4 days, 10 hours, 20 minutes and 30 seconds; the last statement subtracts 14 months from the field.

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Each connection has individual set of macros. The following table enumerates names of predefined macros that are enabled depending on DBMS server connected and provider used.

Database of Databases – UniSQL

Please refer to Macros Reference for more unisqo. Macros and Conditions Macro is a set of name, condition and value. Macros that have values specific for different databases providers. For example the following query.

As you see, it is very easy to control SQL statements transformation. One of the uisql crucial problems in programming applications for several databases is that SQL syntax can be different in many situations. Evaluates to database type that represents floating point values.

unisql

For example, if you connect to Oracle server using dotConnect for Oracle, the following conditions will be enabled: The following examples demonstrate unlsql of macros: