This really depends on what is being requested in the query and the size of each table. A select all SELECT * FROM Table will consume whatever memory required to load records in that table. 2 solved Which is the most memory intensive SQL query: select, update or insert? [closed]
As the OP found out, following these simple steps help find the problem in the CSV file: Look at the error message: bad TEXT table source file – line number: 1196 The line number is the line number of the CSV file. Using a text editor, go to that line. Lines are numbered from 1. … Read more
Well, then this is back to the original question – how do I share a PreparedStatement between connections if there are many connections? I thought connections create hence own PreparedStatements. If that is your sole question -honestly, that was not clear from your initial question-, then you don’t need to worry about this at all. … Read more
You’re using standard quotes instead of backticks for escaping the MySql reserved word KEYS. Change the table name to any non-reserved word so that the quotes can be removed. 1 solved SQL syntax error in “insert into ‘keys'(a,b,c,d,e) values(?,?,?,?,?)” [closed]
{Microsoft Access Driver (*.mdb)} is the name of the older Microsoft Jet driver, which will only work in 32-bit applications. (There are no 64-bit versions of the Jet database engine or the Jet ODBC driver.) To connect with .mdb and .accdb files from a 64-bit application you need to download and install the 64-bit version … Read more
In your code snippet you create PreparedStatements but you do not use them correctly. Prepared statements are meant to be used as a kind of ‘statement template’ which is bound to values before it executes. To quote the javadoc: PreparedStatement pstmt = con.prepareStatement( “UPDATE EMPLOYEES SET SALARY = ? WHERE ID = ?”); pstmt.setBigDecimal(1, 153833.00) … Read more
I’m thinking something like this: Create a prepared statement and do a query with it., getting back a result set. Close the prepared statement. Attempt to close the result set after closing the prepared statement. 0 solved Simulate Result set closing failed [closed]
General Format, query =select * from table_name where table_col1=”+getvalue1()+” && table_col2=”+getvalue2()+”; in order your database, query=”select * from userVO where familyno=”+udto.getFamilyno()+” && date=”+udto.getDate()+”;”; 2 solved where conditon to get date in two columns familyno and date
You need to load the com.mysql.jdbc.Driver driver class. private static final String DRIVER_NAME=”com.mysql.jdbc.Driver”; Look at the official documentation: The name of the class that implements java.sql.Driver in MySQL Connector/J is com.mysql.jdbc.Driver. The org.gjt.mm.mysql.Driver class name is also usable for backward compatibility with MM.MySQL, the predecessor of Connector/J. Use this class name when registering the driver, … Read more
JAR file need to add to project class path. First Right click on you Eclipse Project, Project –> Build Path –> Configure Build Path. Under Libraries tab, click Add Jars or “Add External JARs”. solved Class Not Found Exception: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver? [duplicate]
You have a typo: SELECT * FROM studentdetail instead of SELECT * FORM studentdetail solved select * in java error
i got this from someone else but figured it could be applied to your situation as well. try { Class.forName(“driverName”); //driver name Connection con = DriverManager.getConnection(“url”, “user”, “pass”); Statement st = con.createStatement(); ResultSet rs = st.executeQuery(“Select * from tablename”); //table you want to get information from HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(“sheetName”); … Read more
JDBC doesn’t optimize database queries. A specific JDBC driver might do query optimization, but it is likely that query optimization is done by the backend database. (Many / most worthwhile optimizations require knowledge of the tables that the JDBC driver does not have.) Another question what is the difference between analyse and compiling query in … Read more
how to Hazelcast jet JDBC continues source get data when new record insert or existing record updated in a database table? solved how to Hazelcast jet JDBC continues source get data when new record insert or existing record updated in a database table?
Ok Here the Solution to connect MYSQL with JSP above given program. I asked about to my boss, he is a real expert… First open Netbeans Click on SERVICES then Right Click on the server like for me its “Apache Tomcat” then select Edit Server.XML Add below Line at line 39 i think between GlobalNamingResources … Read more