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Updating the contents of the database is done similarly, but one uses the executeUpdate() method of the Statement object: stmt.executeUpdate("INSERT INTO Student VALUES('Maggie Simpson', 'Williams', 144, '585-223-1234', 'Biology', 'Ivan Heally')"); When the program finishes reading from and writing to the database, the Statement and Connection objects should be closed: // DATABASE CLOSE/CLEANUP stmt.close(); con.close(); There are two other interfaces that inherit from the Statement interface and provide additional functionality. A PreparedStatement object creates a precompiled SQL command that can be executed repeatedly with new values for the column variables. Precompilation leads to efficiency of execution. PreparedStatements are used for repetitive tasks such as loading a table with data. For instance, the program might repetitively (1) read a record of data to be stored, (2) set each field of the PreparedStatement to the proper value, and (3) executeUpdate(). Here is an example of using a PreparedStatement to insert one of several new students into the database: // A prepared statement is precompiled, and can be // used repeatedly with new values for its parameters. // Use question marks for parameter place-holders. PreparedStatement prepStmt = con.prepareStatement( "INSERT INTO Student (Sname, Dorm, Room, Phone)" + "VALUES ( , , , )" ); // Now supply values for the parameters using "setter" methods // This assignment and execution would usually be within // a loop, so that the same work could be done repeatedly for // different values of the column variables. // Parameters are referenced in order starting with 1. prepStmt.setString( 1, "Jack Horner" ); prepStmt.setString( 2, "Arpers" ); prepStmt.setInt ( 3, 31 ); prepStmt.setNull ( 4, Types.VARCHAR ); // The PreparedStatement object methods: // 1) executeUpdate statements that modify the database // 2) executeQuery SELECT statements (reads) prepStmt.executeUpdate(); Note that the PreparedStatement has different setter methods for different data types. Note, too, that if a null value is required, the type of the null must be specified using one of the constants in the Java Types class. The Types class has the Java database types, which may be different from the types used by the DBMS. For instance, Oracle uses a type called VARCHAR2, but the corresponding Java type is VARCHAR. The last interface we will discuss is the CallableStatement, which extends the PreparedStatement interface. A CallableStatement object provides a single mechanism for a Java program to call a stored procedure in any DBMS. A programmer sets up a CallableStatement object much like a programmer does for a PreparedStatement object, but the syntax uses curly braces, and the stored procedure can return one or more ResultSets as well as other parameters. We will not discuss all the possible configurations of the CallableStatement, but here is an example of a CallableStatement that invokes a stored procedure.
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In this case, the stored procedure is named Add_Student, and besides adding the new student, it finds and assigns an advisor for the new student, based on the new student s major. All the program needs to do is set the parameters and then execute the stored procedure. The procedure will do all the complex processing, and then return an indication of success in the sixth parameter. // CallableStatement object to access the stored procedure. // Inside the curley braces, you call the procedure, and use // question marks for parameter place-holders. // Five are for "IN" variables to be set, // One is for an "OUT" varible to be returned to the program CallableStatement callStmt = con.prepareCall( "{call Add_Student( , , , , , )}" ); // Now supply // Parameters callStmt.setString(1, callStmt.setString(2, callStmt.setInt (3, callStmt.setString(4, callStmt.setString(5, values for the parameters are referenced in order starting with 1. "Billy Bob" ); "Appleby" ); 1004 ); "585 223 4599" ); "Math" );
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// And register the OUT variable // This variable returns information to this program // from the stored procedure. callStmt.registerOutParameter( 6, java.sql.Types.VARCHAR ); // The CallableStatement object has an additional method* // for use when the stored procedure uses multiple SQL // statements. // 1) executeUpdate statements that modify the database // 2) executeQuery SELECT statements (reads) // *3) execute procedures with multiple SQL // statements callStmt.execute(); Everything that one might do interactively using SQL commands can be done programmatically from a Java program using JDBC. SUMMARY Although several types of database exist, almost all database systems in wide use today conform to the relational database model first described by Codd in 1970. Data are stored in tables where each row is unique, and each column holds the value of a particular item of data. Rows in each table are identified by a unique key value, which can be the value of a particular key column, or a combination of values from more than one column. Database systems offer advantages by storing data with a minimum amount of redundancy, speeding access to data, providing security and backup of data, and controlling multiuser access. Databases also offer transaction management to insure that related modifications to the database either all succeed, or that no change at all is made. By storing metadata as well as data, databases also allow programs and users to access the information without concern for the details of physical storage. One creates a database by first modeling the data domain using an entity-relationship (E-R) diagram. The E-R diagram identifies the entities, the attributes of the entities, and the relationships between entities the database will track. One then converts the E-R diagram directly to tables and relationships in a database system, using a set of rules for translation.
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