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CHAPTER 1 INTRODUCING JDBC
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* to be automatically released. * @param pstmt a PreparedStatement object. */ public static void close(java.sql.PreparedStatement pstmt) { if (pstmt == null) { return; } try { pstmt.close(); // PreparedStatement object is closed now } catch(Exception ignore) { // ignore the exception // could not close the PreparedStatement // cannot do much here } }
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Step 11: Closing the Connection
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If you are using a connection pool manager (to manage a set of database Connection objects), then you need to release (this is called a soft close) the Connection object to the connection pool manager; otherwise, you can use the close() method, which releases this Connection object s database and JDBC resources immediately instead of waiting for them to be automatically released. The following code listing shows some sample code for closing a Connection object; it is always a good idea to have utility classes close these JDBC resources: /** * Close the Connection object. Releases the Connection * object's database and JDBC resources immediately instead * of waiting for them to be automatically released. * @param conn a Connection object. */ public static void close(java.sql.Connection conn) { if (conn == null) { return; } try { if (!conn.isClosed()) { // close the Connection object conn.close(); } // Connection object is closed now } catch(Exception ignore) { // ignore the exception // could not close the Connection object // cannot do much here } }
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CHAPTER 1 INTRODUCING JDBC
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1-9. What Is the JDBC API (in a Nutshell)
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The JDBC API is comprised of two Java packages (both are included in JDK 1.4): java.sql: This is the initial package that provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language. For details, please refer to the official documentation at http://java.sun.com/j2se/1.5.0/ docs/api/java/sql/package-summary.html. javax.sql: This is an extended package that provides the API for server-side data source access and processing from the Java programming language. For details, please refer to the official documentation at http://java.sun.com/j2se/1.5.0/docs/api/javax/sql/package-summary.html. As mentioned, the java.sql package provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language. This JDBC API includes a framework and architecture whereby different drivers (implemented by different database vendors) can be installed dynamically to access different data sources (see Figure 1-9). Although the JDBC API is mainly geared to passing SQL statements to a database, it provides for reading and writing data from any data source with a tabular format. The reader/writer facility, available through the javax.sql.RowSet group of interfaces, can be customized to use and update data from a spreadsheet, flat file, or any other tabular data source.
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Figure 1-9. JDBC architecture in a nutshell
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The javax.sql package supports the following concepts: The DataSource interface as an alternative to DriverManager for establishing a connection with a data source. 2 discusses DataSource in detail. Connection pooling Distributed transactions Row sets
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1-10. What Are the Core JDBC Classes/Interfaces
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Figure 1-10 shows the core JDBC classes/interfaces used to access a database.
CHAPTER 1 INTRODUCING JDBC
Figure 1-10. Core JDBC classes/interfaces
The core JDBC classes/interfaces are as follows: java.sql.DriverManager: The major task of the DriverManager class is to access the JDBC drivers and create java.sql.Connection (database connection) objects. java.sql.Connection: This interface represents a database connection. This is the key for accessing most of the database objects (such as tables, columns, and so on). java.sql.Statement: The Connection object creates Statement objects. You can use the Statement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.PreparedStatement: The Connection object creates PreparedStatement (parameterized statement) objects. You can use the PreparedStatement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.CallableStatement: The Connection object creates CallableStatement (statements used to execute stored procedures) objects. You can use the PreparedStatement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.ResultSet: The result of a SQL query is returned via a ResultSet object (a table of data representing a database result set, which is usually generated by executing a statement that queries the database).
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