c# barcode reader library DATABASE METADATA, PART 2 in Font

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CHAPTER 3 DATABASE METADATA, PART 2
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<columnDataType>3</columnDataType> <columnReturnTypeName>NUMBER</columnReturnTypeName> <columnPrecision>22</columnPrecision> <columnByteLength>22</columnByteLength> <columnScale>0</columnScale> <columnRadix>10</columnRadix> <columnNullable>1</columnNullable> <columnRemarks>null</columnRemarks> </storedProcedure> </stored_procedures_signature>
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Client Program 2 For this client program, let s define another stored procedure (call it showUsers, which lists all of the users) that does not have any arguments. Note that the all_users table holds all of the users in the Oracle database. SQL> describe all_users; Name Null Type ----------------------------------------- -------- -----------------USERNAME NOT NULL VARCHAR2(30) USER_ID NOT NULL NUMBER CREATED NOT NULL DATE SQL> SQL> CREATE OR REPLACE PROCEDURE showUsers AS 2 BEGIN 3 for A_USER in ( SELECT * from all_users ) LOOP 4 -do something 5 DBMS_OUTPUT.PUT_LINE('UserName: '|| A_USER.UserName); 6 end loop; 7 END showUsers; 8 / Procedure created. SQL> describe showusers; PROCEDURE showusers SQL> set serveroutput on SQL> exec showUsers; UserName: SYS UserName: SYSTEM UserName: OUTLN UserName: DBSNMP ...
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CHAPTER 3 DATABASE METADATA, PART 2
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UserName: UserName: UserName: UserName: UserName:
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QS_CBADM QS_CB QS_CS SCOTT OCTOPUS
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PL/SQL procedure successfully completed. String signature = DatabaseMetaDataTool.getStoredProcedureSignature (conn, "", "OCTOPUS", // user "SHOWUSERS", // stored procedure name "%"); // all columns System.out.println(signature); Output of Client Program 2 As you can observe, there are no signature definitions for the showUsers stored procedure because showUsers has no arguments whatsoever. < xml version='1.0'> <stored_procedures_signature> </stored_procedures_signature>
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3.5. What Is the Username of the Database Connection
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You can use DatabaseMetaData to get the name of the database user used in creating a connection object. The following snippet shows how: import java.sql.Connection; import java.sql.DatabaseMetaData; ... Connection conn = null; try { conn = getConnection(); // returns a Connection DatabaseMetaData dbMetaData = conn.getMetaData(); if (dbMetaData == null) { System.out.prinln("database does not support metadata."); System.exit(0); } // retrieve the user name as known to this database. String user = dbMetaData.getUserName(); System.out.prinln("database user="+user); } catch(Exception e) { // handle the exception e.printStackTrace(); }
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CHAPTER 3 DATABASE METADATA, PART 2
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3.6. Is the Database Connection Read-Only
In GUI database applications, before letting the user insert or update records, you need to make sure that the given Connection object is updatable (which means that records can be inserted or updated). To check for this, you can use the DatabaseMetaData.isReadOnly() method. This method returns true if the associated database is in read-only mode (which means that inserts or updates are not allowed). The following snippet shows how to use this method: import java.sql.Connection; import java.sql.DatabaseMetaData; ... Connection conn = null; DatabaseMetaData dbMetaData = null; try { conn = getConnection(); // get a valid database connection dbMetaData = conn.getMetaData(); if (dbMetaData == null) { // database metadata is NOT supported } else { // database metadata is supported and you can invoke // over 100 methods defined in DatabaseMetaData // check to see if the database is read-only boolean readOnly = dbMetaData.isReadOnly(); if (readOnly) { // insert/updates are not allowed } else { // insert/updates are allowed } ... } } catch(SQLException e) { // deal and handle the exception ... } finally { // close resources }
3.7. What Is the JDBC s Driver Information
DatabaseMetaData has four driver-related methods, which are discussed in this section. We will combine all of them into a single method called getDriverInformation() and return the result as XML (serialized as a String object).
CHAPTER 3 DATABASE METADATA, PART 2
DatabaseMetaData Methods Supporting Driver Information
int getJDBCMajorVersion() // Retrieves the major JDBC version number for this driver. int getJDBCMinorVersion() // Retrieves the minor JDBC version number for this driver. String getDriverName() // Retrieves the name of this JDBC driver. String getDriverVersion() // Retrieves the version number of this JDBC driver as a String.
XML Syntax for Output (Driver Information)
< xml version='1.0'> <DriverInformation> <driverName>driver name</driverName> <driverVersion>driver version</driverVersion> <jdbcMajorVersion>JDBC major version</jdbcMajorVersion> <jdbcMinorVersion>JDBC minor version</jdbcMinorVersion> </DriverInformation>
The Solution
The solution is generic enough and can support MySQL, Oracle, and other relational databases. /** * Get driver name and version information. * This method calls 4 methods (getDriverName(), * getDriverVersion(), getJDBCMajorVersion(), * getJDBCMinorVersion()) to get the required information * and it returns the information as XML. * * @param conn the Connection object * @return driver name and version information * as an XML document (represented as a String object). * */ public static String getDriverInformation(java.sql.Connection conn) throws Exception { try { DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } StringBuffer sb = new StringBuffer("< xml version='1.0'>"); sb.append("<DriverInformation>");
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