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CHAPTER 13 JDBC and Java Data Objects
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Inserting a row into the resultset is a three-step process First, position the cursor at the row by calling the moveToInsertRow() method Second, place values into the columns of the new row You do this by calling the updateXXX() method, as described previously in this chapter The updateXXX() method must be passed the column name or number as the first parameter and the value that will be placed in the column as the second parameter Remember that XXX must be replaced with the data type of the column Third, you call the insertRow() method after calling the updateXXX() method The insertRow() method opens a new row in the resultset and places values specified in the updateXXX() method into each column The following example illustrates how to insert a new row in a resultset:
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String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; Statement dataRequest; ResultSet results; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); dB = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + e); Systemexit(1); } catch (SQLException e) { Systemerrprintln( "Cannot connect to the database" + e); Systemexit(2); } try { String query = "SELECT FirstName,LastName FROM Students"; DataRequest = dBcreateStatement(CONCUR_UPDATABLE); results = dataRequestexecuteQuery (query); } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } boolean records = resultsnext(); if (!records ) {
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Systemoutprintln("No data returned"); Systemexit(4); } try { resultsmoveToInsertRow (); resultsupdateString (1, "Tom"); resultsupdateString (2, "Smith"); resultsinsertRow(); resultsmoveToCurrentRow(); dataRequestclose();
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} catch (SQLException e ) { Systemerrprintln("Data display error" + e); Systemexit(5); } finally { dBclose(); }
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As you previously learned in this chapter, metadata is data about data, such as the name of a column, the data type of a column, and the size of the column Metadata is returned by the DBMS as part of the resultset You can access metadata by using the DatabaseMetaData interface In order to access metadata, you must call the getMetaData() method, which is defined in the Connection class The getMetaData() method returns a DatabaseMetaData object that contains metadata An assortment of metadata is available to your program You retrieve specific metadata by calling the appropriate method Here are some of the more commonly used methods (notice that the name of the method implies the nature of the metadata it returns):
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getDatabaseProductName() Returns the product name of the
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database getUserName() Returns the user s name getURL() Returns the URL of the database
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CHAPTER 13 JDBC and Java Data Objects
getSchemas() Returns all the schema names available in this database getPrimaryKeys() Returns primary keys getProcedures() Returns stored procedure names getTables() Returns the names of tables in the database
Two types of metadata can be retrieved from the DBMS The first type contains metadata that describes the database in the DBMS, which is accessible by calling the appropriate method in the preceding table The other type of metadata describes the resultset In order to access metadata of the resultset, you need to call the getMetaData() method defined by the ResultSet object, as shown here:
ResultSetMetaData rm = resultgetMetaData();
The getMetaData() method returns a ResultSetMetaData object that contains the metadata for the resultset Here are the commonly called methods used to retrieve specific metadata from the resultset:
getColumnCount() Returns the number of columns contained in the
resultset getColumnName(int number) specified by column number getColumnType(int number) specified by the column number Returns the name of the column Returns the data type of the column
We don t have room in this chapter to fit in all the methods used to retrieve metadata You can find information about those methods by visiting Sun Microsystems website at javasuncom
Data Types
Throughout this chapter, we refer to the setXXX() and getXXX() methods used to store a value in a column of a resultset and to retrieve a value from a column of a resultset The XXX refers to the data type of the column Table 13-1 contains a list of data types and their Java equivalents You can use this list to determine the proper data name to use when replacing the XXX in the setXXX() and getXXX() methods
SQL Type CHAR VARCHAR LONGVARCHAR NUMERIC DECIMAL BIT TINYINT SMALLINT INTEGER BIGINT REAL FLOAT DOUBLE BINARY VARBINARY LONGVARBINARY BLOB CLOB ARRAY STRUCT REF DATALINK DATE TIME TIMESTAMP Java Type String String String javamathBigDecimal javamathBigDecimal Boolean Byte Short Integer Long Float Float Double Byte[] Byte[] Byte[] javasqlBlob javasqlClob javasqlArray javasqlStruct javasqlRef javasqlTypes javasqlDate javasqlTime javasqlTimestamp
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