javax.servlet.jsp.jstl.sql.SQLExecutionTag Maven / Gradle / Ivy
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package javax.servlet.jsp.jstl.sql;
/**
* This interface allows tag handlers implementing it to receive
* values for parameter markers in their SQL statements.
*
* This interface is implemented by both <sql:query> and
* <sql:update>. Its addSQLParameter() method
* is called by nested parameter actions (such as <sql:param>)
* to substitute PreparedStatement parameter values for
* "?" parameter markers in the SQL statement of the enclosing
* SQLExecutionTag action.
*
* The given parameter values are converted to their corresponding
* SQL type (following the rules in the JDBC specification) before
* they are sent to the database.
*
* Keeping track of the index of the parameter values being added
* is the responsibility of the tag handler implementing this
* interface
*
* The SQLExcecutionTag interface is exposed in order
* to support custom parameter actions which may retrieve their
* parameters from any source and process them before substituting
* them for a parameter marker in the SQL statement of the
* enclosing SQLExecutionTag action
*
* @author Justyna Horwat
*/
public interface SQLExecutionTag {
/**
* Adds a PreparedStatement parameter value.
* Must behave as if it calls PreparedStatement.setObject(int, Object).
* For each tag invocation, the integral index passed logically to setObject()
* must begin with 1 and must be incremented by 1 for each subsequent invocation
* of addSQLParameter(). The Object logically passed to setObject() must be the
* unmodified object received in the value argument.
*
* @param value the PreparedStatement parameter value
*/
public void addSQLParameter(Object value);
}