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CHAPTER
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Parameter Metadata
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If one is given in a continuum, without first proceeding from a metric, it constitutes a generalization of Riemannian geometry but which still retains the most important derived parameters. Albert Einstein
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his chapter presents java.sql.ParameterMetaData, a new interface defined in JDBC 3.0. The ParameterMetaData interface contains methods that retrieve information about the parameter markers (indicated with a ) in a PreparedStatement object. ParameterMetaData is an object that can be used to get information about the types and properties of the parameters in a PreparedStatement object. ParameterMetaData describes the number, type, and properties of parameters to prepared statements. The method PreparedStatement.getParameterMetaData() returns a ParameterMetaData object that describes the parameter markers that appear in the PreparedStatement object. The ParameterMetaData interface and the PreparedStatement.getParameterMetaData() method are part of the JDBC 3.0 API and are included in J2SE 5.0 (JDK 1.5). For details on ParameterMetaData, refer to the JDBC 3.0 final specification. ParameterMetaData is an optional interface, and some vendors might not implement it. If the method PreparedStatement. getParameterMetaData() returns a null object, then it means that ParameterMetaData is not implemented. Note that CallableStatement.getParameterMetaData() is a valid method call (CallableStatement extends the PreparedStatement interface), which should return metadata about the parameters of a stored procedure (represented as a CallableStatement). Keep in mind this critical point when reading this chapter: neither MySQL s JDBC driver nor Oracle s JDBC thin driver implements the ParameterMetaData interface; we will illustrate these cases with an example. To use and understand ParameterMetaData, we will use the following databases (both of the following databases support ParameterMetaData): HSQLDB 100% Java database (http://hsqldb.sourceforge.net/), which supports ParameterMetaData implementation. HSQLDB is a SQL-based relational database engine written in Java. It has a JDBC driver (org.hsqldb.jdbcDriver) and supports a rich subset of ANSI-92 SQL and SQL 99. It offers a small, fast database engine that provides both in-memory and disk-based tables. For using HSQLDB, refer to the HSQLDB User Guide (http://hsqldb.sourceforge.net/doc/guide/guide.pdf).
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CHAPTER 5 PARAMETER METADATA
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Derby (Apache s Derby Database, at http://incubator.apache.org/derby/) is a relational database management system (RDBMS) that is based on Java and SQL. You can deploy Derby in a number of different ways: Embedded in a single-user Java application. Derby can be almost invisible to the end user because it requires no administration and runs in the same Java virtual machine (JVM) as the application. Embedded in a multiuser application such as a web server, an application server, or a shared development environment. Embedded in a server framework. You can use the network server with the network client driver or a server of your own choice.
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5.1. What Are Dynamic Parameters
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You can prepare SQL queries and statements that are allowed to have dynamic parameters for which the value is not specified when the statement or query is prepared by using PreparedStatement methods in the JDBC API. These parameters, known as dynamic parameters, are represented by a . The JDBC refers to dynamic parameters as IN (input), INOUT (input and output), or OUT (output) parameters. In SQL, they are always IN (input) parameters. Before you execute queries by PreparedStatement object, you must specify values for all input parameters. The values specified must match the types expected. Also, dynamic parameters can be used with CallableStatement (this interface extends the PreparedStatement interface) objects (which represents a stored procedure or function in a database server). A CallableStatement object may have any number of IN (input), INOUT (input and output), or OUT (output) parameters. Next, I provide a dynamic parameter example.
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MySQL Database Setup
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mysql> use octopus; Database changed mysql> desc employees; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(8) | | PRI | | | | name | varchar(16) | YES | | NULL | | | age | int(11) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.01 sec)
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