加載JDBC驅動程序
可使用Class.forName方法顯式加載一個驅動程序。
如使用JDBC-ODBC橋：
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
建立連接
DriverManager類的getConnection方法用於建立與某個數據源的連接。
如：
String url="jdbc:odbc:component";
Connection dataconn=
DriverManager.getConnection(url);
String url="jdbc:odbc:component";
Connection dataconn=
DriverManager.getConnection(url,"sa", "123");
連接數據庫示例
package jdbcpkg;
import java.sql.*;
public class DBConn {
private Connection dataconn = null;
public DBConn() {
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
dataconn = DriverManager.getConnection(“jdbc:odbc:MyJdbcOdbcSQL","sa","");
}
catch(Exception e){
System.out.println(e.toString());
}
public void setDataInsert(){
try{
Statement stmt = dataconn.createStatement();
stmt.executeUpdate("insert into jobs values('MyDesc',10,50)");
stmt.close();
System.out.println("數據插入成功！");
}
catch(Exception e){
System.out.println(e.toString());
}
}
public void setDataUpdate(int jobID){
try{
Statement stmt = dataconn.createStatement();
stmt.executeUpdate("update jobs set job_desc='OK Desc' where job_id="+jobID);
stmt.close();
System.out.println("數據修改成功！");
}
catch(Exception e){
System.out.println(e.toString());
}
}
public void setDataDelete(int jobID){
try{
Statement stmt = dataconn.createStatement();
stmt.executeUpdate("delete jobs where job_id = "+jobID);
stmt.close();
System.out.println("數據刪除成功！");
}
catch(Exception e){
System.out.println(e.toString());
}
}
public int getDataUpdateCount(int min_lvl){
int intCount = -1;
try{
Statement stmt = dataconn.createStatement();
intCount = stmt.executeUpdate("update jobs set job_desc='Update Desc' where min_lvl =" + min_lvl);
stmt.close();
return intCount;
}
catch(Exception e){
System.out.println(e.toString());
return intCount;
}
}
public void getJobsData(){
try{
Statement stmt = dataconn.createStatement();
ResultSet rs = stmt.executeQuery("select * from jobs");
while(rs.next()){
System.out.println(rs.getInt("job_id")+" "+rs.getString("job_desc"));
System.out.println("-----------------------------------------------");
}
rs.close();
stmt.close();
}
catch(Exception e){
System.out.println(e.toString());
}
}
}
}
獲取數據庫信息示例
在DBConn.java中增加主函數main()及函數outDataMsg()如下：
public void outDataMsg(){
try{
DatabaseMetaData metaData = dataconn.getMetaData();
System.out.println(metaData.getURL());
System.out.println(metaData.getUserName());
System.out.println(metaData.isReadOnly());
System.out.println(metaData.getDatabaseProductName());
System.out.println(metaData.getDatabaseProductVersion());
System.out.println(metaData.getDriverName());
System.out.println(metaData.getDriverVersion());
}
catch(Exception e){
System.out.println(e.toString());
}
}
public static void main(String args[]){
DBConn c = new DBConn();
c.outDataMsg();
}