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17 Μαΐ 2012 · You'd have to execute a dynamically concatenated SQL string, which unfortunately would compromise whatever benefits parametrized SQL had afforded you to begin with. See this post. DECLARE @SQL varchar(250) SELECT @SQL = 'Select * From ' + @TableName + ' Where ' + @param + ' = 1'.
Bulk binds can improve the performance when loading collections from a queries. The BULK COLLECT INTO construct binds the output of the query to the collection. To test this create the following table.
V$SQL lists statistics on shared SQL areas without the GROUP BY clause and contains one row for each child of the original SQL text entered.
If you want to use the value of a bind variable in a SQL*Plus command, it must first be copied to a substitution variable. SQL*Plus commands such as SPOOL, SET and TTITLE are executed in the SQL*Plus program and are not passed to the database for execution.
2 Ιουν 2023 · Bind variables, often called bind parameters or query parameters, are often used in WHERE clauses to filter data. Instead of putting the required value into the query, or writing separate queries for each different value, or concatenating strings, you can use bind variables. Here’s how it works.
Concatenating variable values into a SQL statement makes the statement unique, forcing a hard parse. By contrast, using bind variables allow reuse of statements as the text of the statement remains the same. Only the value of the bind variable changes.
V$SQL_BIND_DATA describes, for each distinct bind variable in each cursor owned by the session querying this view: Actual bind data, if the bind variable is user defined. The underlying literal, if the CURSOR_SHARING parameter is set to FORCE and the bind variable is system generated.
