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CHAPTER 6 EXPLORING DRIVER PROPERTY INFORMATION
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strictUpdates (Required: false) Choices are: true false Description: Should the driver do strict checking (all primary keys selected) of updatable result sets ...' (defaults to 'true'). ignoreNonTxTables (Required: false) Choices are: true false Description: Ignore non-transactional table warning for rollback (defaults to 'false'). reconnectAtTxEnd (Required: false) Choices are: true false Description: If autoReconnect is set to true, should the driver attempt reconnectionsat the end of every transaction (true/false, defaults to false) alwaysClearStream (Required: false) Choices are: true false Description: Should the driver clear any remaining data from the input stream before issuing a query Normally not needed (approx 1-2% perf. penalty, true/false, defaults to false) cachePrepStmts (Required: false) Choices are: true false Description: Should the driver cache the parsing stage of Prep aredStatements (true/false, default is 'false') prepStmtCacheSize (Required: false) No choices. Description: If prepared statement caching is enabled, how many prepared statements should be cached (default is '25') prepStmtCacheSqlLimit (Required: false) No choices. Description: If prepared statement caching is enabled, what's the largest SQL the driver will cache the parsing for (in chars, default is '256') useUnbufferedInput (Required: false) No choices. Description: Don't use BufferedInputStream for reading data from the server true/false (default is 'true') ----------
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Running the Solution for an ODBC Database
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The JDBC-ODBC bridge driver does not properly return an array of DriverPropertyInfo objects, but instead throws either a NullPointerException or java.sql.SQLException: $ java PrintDriverPropertyInfo "jdbc-odbc" "jdbc:odbc:northwind" driver=sun.jdbc.odbc.JdbcOdbcDriver@757aef Exception in thread "main" java.sql.SQLException: [Microsoft][ODBC Driver Manager] Driver does not support this function
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CHAPTER 6 EXPLORING DRIVER PROPERTY INFORMATION
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sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6958) sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7115) sun.jdbc.odbc.JdbcOdbc.SQLBrowseConnect(JdbcOdbc.java:2552) sun.jdbc.odbc.JdbcOdbcDriver.getConnectionAttributes(JdbcOdbcDriver.java:664) at sun.jdbc.odbc.JdbcOdbcDriver.getPropertyInfo(JdbcOdbcDriver.java:359) at PrintDriverPropertyInfo.main(PrintDriverPropertyInfo.java:85)
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Running the Solution for an Oracle Database
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Oracle s JDBC driver does not implement Driver.getPropertyInfo() properly. It just returns an empty array. Here is a section of code from Oracle s JDBC driver: package oracle.jdbc.driver; import import import import java.sql.*; java.util.*; oracle.sql.CharacterSetWithConverter; oracle.sql.converter.CharacterConverterFactoryOGS;
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public class OracleDriver implements Driver { public OracleDriver() { driverExtensions = new OracleDriverExtension[4]; } public DriverPropertyInfo[] getPropertyInfo(String s, Properties properties) throws SQLException { return new DriverPropertyInfo[0]; } }
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6.5. How Does MySQL s Driver Implement Driver.getPropertyInfo()
MySQL s Connector/J (the JDBC driver for MySQL databases) implements Driver. getPropertyInfo() as follows. I have formatted the syntax to fit the page. The following classes (com.mysql.jdbc.NonRegistering and com.mysql.jdbc.Driver) work together to implement the java.sql.Driver interface. You should study these classes if you are a driver developer rather than an application developer.
Class Definition for com.mysql.jdbc.NonRegistering
package com.mysql.jdbc; import java.sql.DriverManager; import java.sql.SQLException;
CHAPTER 6 EXPLORING DRIVER PROPERTY INFORMATION
public class Driver extends NonRegisteringDriver { public Driver() } throws SQLException {
static { try { DriverManager.registerDriver(new Driver()); } catch(SQLException E) { throw new RuntimeException("Can't register driver!"); } } }
Class Definition for com.mysql.jdbc.Driver
Here, the String objects have been formatted to fit the page: package com.mysql.jdbc; import java.sql.*; import java.util.Properties; import java.util.StringTokenizer; public class NonRegisteringDriver implements Driver { public NonRegisteringDriver() } throws SQLException {
public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) throws SQLException { if(info == null) info = new Properties(); if(url != null && url.startsWith("jdbc:mysql://")) info = parseURL(url, info); DriverPropertyInfo hostProp = new DriverPropertyInfo("HOST", info.getProperty("HOST")); hostProp.required = true; hostProp.description = "Hostname of MySQL Server"; DriverPropertyInfo portProp = new DriverPropertyInfo("PORT", info.getProperty("PORT", "3306")); portProp.required = false; portProp.description = "Port number of MySQL Server"; DriverPropertyInfo dbProp = new DriverPropertyInfo("DBNAME", info.getProperty("DBNAME")); dbProp.required = false; dbProp.description = "Database name";
CHAPTER 6 EXPLORING DRIVER PROPERTY INFORMATION
DriverPropertyInfo userProp = new DriverPropertyInfo("user", info.getProperty("user")); userProp.required = true; userProp.description = "Username to authenticate as"; DriverPropertyInfo passwordProp = new DriverPropertyInfo("password", info.getProperty("password")); passwordProp.required = true; passwordProp.description = "Password to use for authentication"; DriverPropertyInfo autoReconnect = new DriverPropertyInfo("autoReconnect", info.getProperty("autoReconnect", "false")); autoReconnect.required = false; autoReconnect.choices = (new String[] { "true", "false" }); autoReconnect.description = "Should the driver try to re-establish bad connections "; DriverPropertyInfo maxReconnects = new DriverPropertyInfo("maxReconnects", info.getProperty("maxReconnects", "3")); maxReconnects.required = false; maxReconnects.description = "Maximum number of reconnects to attempt if autoReconnect is true"; DriverPropertyInfo initialTimeout = new DriverPropertyInfo("initialTimeout", info.getProperty("initialTimeout", "2")); initialTimeout.required = false; initialTimeout.description = "Initial timeout (seconds) to wait between failed connections"; DriverPropertyInfo profileSql = new DriverPropertyInfo("profileSql", info.getProperty("profileSql", "false")); profileSql.required = false; profileSql.choices = (new String[] { "true", "false" }); profileSql.description = "Trace queries and their execution/fetch times on"+ " STDERR (true/false) defaults to false"; DriverPropertyInfo socketTimeout = new DriverPropertyInfo("socketTimeout", info.getProperty("socketTimeout", "0")); socketTimeout.required = false; socketTimeout.description = "Timeout on network socket operations (0 means no timeout)"; DriverPropertyInfo useSSL = new DriverPropertyInfo("useSSL", info.getProperty("useSSL", "false")); useSSL.required = false; useSSL.choices = (new String[] { "true", "false" });
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