Query MySQL DB using preparedStatement.setDate - mysql

Question

public java.util.List<Tag> getAlltagsByDate(String date ){
DataSource dataSource = new DataSource();
Connection conn = dataSource.createConnection();
ResultSet resultSet = null;
PreparedStatement stmt = null;
Tag tags_Data = new Tag();
String query = "select * from tag_data where tag_data_date = ?";
try {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date nn =df.parse(date);
stmt = conn.prepareStatement(query);
stmt.setDate(1, java.sql.Date.valueOf(date));
resultSet = stmt.executeQuery(query);
I am getting an error
Can anyone help me with this,
I need to query mySQL db where date = input in html

Answer 1

No, skip the Date part; simply use the string. Let's see the value of (String date ).
MySQL is happy if you can end up with ... tag_data_date = '2015-12-11'.
If String date looks like '2015-12-11', then the conversion to Date is unnecessary.

Answer 2

I have presented a solution. As you have not mentioned much about your DB structure, so ,
Consider test as database name, and consisting of table tag_data having two columns id and tag_data_date as shown below.
CREATE TABLE `tag_data` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`tag_data_date` datetime DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Also consider data in table as
INSERT INTO `tag_data` (`id`, `tag_data_date`) VALUES
(1, '2015-12-20 00:00:00');
And your java class as below
public class JDBCPreparedStatementExample {
private static final String DB_DRIVER = "com.mysql.jdbc.Driver"; //mysql driver class
private static final String DB_CONNECTION = "jdbc:mysql://localhost:3306/test"; //connectionstring
private static final String DB_USER = "root"; //mysql username
private static final String DB_PASSWORD = "root"; //mysql password
public static void main(String[] argv) throws ParseException {
try {
getDateForDate("2015-12-20"); //time passed as arguement
} catch (SQLException e) {
System.out.println(e.getMessage());
}
}
//Method to interact with DB and print data,this can be changed to return value of List<Key> as per your requirement
private static void getDateForDate(String date) throws SQLException, ParseException {
Connection dbConnection = null;
PreparedStatement preparedStatement = null;
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date dateCal =df.parse(date); // parse date in String to Date Object
String updateTableSQL = "select * from tag_data where tag_data_date = ?";
try {
//get DB connection
dbConnection = getDBConnection();
// Create preapared statement
preparedStatement = dbConnection.prepareStatement(updateTableSQL);
preparedStatement.setDate(1, new Date(dateCal.getTime()));//convert java.util.Date to java.sql.Date
// execute update SQL stetement
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
// It is possible to get the columns via name
// also possible to get the columns via the column number
// which starts at 1
// e.g. resultSet.getString(2);
int id = resultSet.getInt("id");
Date tag_data_date = resultSet.getDate("tag_data_date");
System.out.println("Date: " + tag_data_date);
System.out.println("Comment: " + id);
}
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (preparedStatement != null) {
preparedStatement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
private static Connection getDBConnection() {
Connection dbConnection = null;
try {
Class.forName(DB_DRIVER);
} catch (ClassNotFoundException e) {
System.out.println(e.getMessage());
}
try {
dbConnection = DriverManager.getConnection(
DB_CONNECTION, DB_USER,DB_PASSWORD);
return dbConnection;
} catch (SQLException e) {
System.out.println(e.getMessage());
}
return dbConnection;
}
}