This mysql script does not work correctly. I tried executing the query to create tables in the phpmyadmin and it worked. The database is created but the table does not get created and I do not get any errors/stack traces.
This is my code
public void createDatabase() {
java.sql.Connection conn = null;
java.sql.Statement stmt = null;
try{
// Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
// Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected database successfully...");
// Create database
System.out.println("Creating table in given database...");
stmt = conn.createStatement();
String createdatabase = "CREATE DATABASE TimePoints;";
stmt.executeUpdate(createdatabase);
System.out.println("Created the database.");
// Create table
System.out.println("Creating table in given database...");
stmt = conn.createStatement();
String createtable = "CREATE TABLE players (playername VARCHAR(38), playertime BIGINT);";
stmt.executeUpdate(createtable);
System.out.println("Created the table.");
}catch(SQLException se){
// Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
// Handle errors for Class.forName
e.printStackTrace();
}finally{
// Finally block used to close resources
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}// do nothing
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
} //end finally try
} //end try
System.out.println("Goodbye!");
}
Related
try {
Connection conn = DriverManager.getConnection("jdbc:sqlite:C://127.0.0.1:1234//nizardb");
} catch (SQLException e) {
System.out.println(e.getMessage());
}
the output is:-
No suitable driver found for jdbc:sqlite:C://127.0.0.1:1234//nizardb
Try this:
DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn= DriverManager.getConnection("jdbc:sqlite:C://127.0.0.1:1234//nizardb");
You also need the JDBC driver.
I cant print SQL table with JAVA. I think JDBC Connection is not a problem. How can I print table in console??
Connection conn = null;
Statement stmt = null;
String url = "jdbc:oracle:thin:#localhost:1521:orcl";
String user = "system";
String pwd = "SSTTaarr00119922";
ResultSet rs = null;
I did drivermanager getconnection.
System.out.println("start Connection");
try {
Class.forName("oracle.jdbc.OracleDriver");
conn = DriverManager.getConnection(url, user, pwd);
} catch (ClassNotFoundException e1) {
System.out.println("Error loading driver:" + e1.toString());
return;
} catch (Exception e2) {
System.out.println("Fail DB Connection:" + e2.toString());
return;
}
String sql = "SELECT * FROM dept";
try {
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
System.out.println(sql);
while (rs.next()) {
String deptno = rs.getString(1);
String dname = rs.getString(2);
String Loc = rs.getString(3);
System.out.println(deptno + dname + Loc);
}
I cant print while func.
In your code, you are missing the catch in try---catch block. The code below is worked with SQL Server
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
System.out.println("start Connection");
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn = DriverManager.getConnection("jdbc:sqlserver://localhost;databaseName=xxx;", "yyy", "zzz");
} catch (ClassNotFoundException e1) {
System.out.println("Error loading driver:" + e1.toString());
return;
} catch (Exception e2) {
System.out.println("Fail DB Connection:" + e2.toString());
return;
}
String sql = "SELECT * FROM [dbo].[User]";
try {
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
System.out.println(sql);
while (rs.next()) {
String deptno = rs.getString(1);
String dname = rs.getString(2);
String Loc = rs.getString(3);
System.out.println(deptno + dname + Loc);
}
} catch (Exception e2) {
System.out.println("Fail DB Connection:" + e2.toString());
}
I am trying to connect my java application with Microsoft SQL Server DBMS.
here is my connection string:
try{
String host = "jdbc:sqlserver://localhost:1433;databaseName=JITM;integratedSecurity=true";
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerh=Driver");
con = DriverManager.getConnection(host);
stmt = con.createStatement();
System.out.println("Connection Successful");
}catch(SQLException err){
System.out.println(err.getMessage());
}catch (ClassNotFoundException ex) {
System.out.println(ex.getMessage());
}
it display this error.
com.microsoft.sqlserver.jdbc.SQLServerh=Driver
i have added sqljdbc41.jar in the libraries. the database is windows authentication.
You have a misprint in the name of a driver class.
Change that code line to this Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
In my application I'm using neo4j-community-2.3.0-M02 with neo4j-jdbc 2.3.2 . It creates large number of threads each should execute 3 or 4 cypher queries. To execute queries I use following method,
private ResultSet executeCypher(String queryString) throws Exception {
try {
String restUrl = getPropertiesCache().getCofigProperty("neo4j_url");
String driver = getPropertiesCache().getCofigProperty("neo4j_driver");
String userName = getPropertiesCache().getCofigProperty("neo4j_user");
String passWord = getPropertiesCache().getCofigProperty("neo4j_pwd");
Class.forName(driver);
try{
Neo4jConnection connection = (Neo4jConnection)
DriverManager.getConnection(restUrl, userName, passWord);
try {
PreparedStatement stmt = connection.prepareStatement(queryString);
try{
ResultSet rs = (ResultSet) stmt.executeQuery(queryString);
stmt.close();
connection.close();
return rs;
}catch (SQLException e){
e.printStackTrace();
} catch (NullPointerException e1){
e1.printStackTrace();
} catch (RuntimeException e2){
e2.printStackTrace();
}
if(!stmt.isClosed()){
stmt.close();
}
}catch (Exception e){
e.printStackTrace();
}
if(!connection.isClosed()){
connection.close();
}
}catch (Exception e){
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
Which means I'm creating db connection for each cypher query. I think it's very bad idea because when creating large number of connections most of them start to be timeout. I think db connection pooling will help on this case or is there any better idea regarding this than connection pool?
If connection pooling solve this issue, please give an example of how to create db connection pool using neo4j jdbc driver.
The neo4j-jdbc 2.3X driver uses the REST API to connect to the database, basically they are http calls using Restlet API, so there is no connection being opened or closed when you create/close JDBC connections.
I need your help in storing the fetched values from a database into a text file (Sample.txt). Each fetched row should be stored in the text file and separated by a line break. After each retrieved column it should be separated by a line "|", So I need your help. Here is the code:
public void GenerateTXT() {
Connection conn = null;
Statement stmt = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
stmt = conn.createStatement();
String sql = "SELECT id, name, amount FROM Employee";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()){
int id = rs.getInt("id");
int age = rs.getString("name");
String first = rs.getInt("amount");
}
rs.close();
}catch(SQLException se){
se.printStackTrace();
}catch(Exception e){
e.printStackTrace();
}finally{
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
}
you can use the below code.
public void GenerateTXT() {
Connection conn = null;
Statement stmt = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
stmt = conn.createStatement();
File file = new File("/path/to/file/filename.txt");
// if file doesnt exists, then create it
if (!file.exists()) {
file.createNewFile();
}
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
String sql = "SELECT id, name, amount FROM Employee";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()){
int id = rs.getInt("id");
int age = rs.getString("name");
String first = rs.getInt("amount");
bw.append(id+"|"+age+"|"+first+"\n");
}
rs.close();
bw.close();
}catch(SQLException se){
se.printStackTrace();
}catch(Exception e){
e.printStackTrace();
}finally{
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
}
}