jdbc

问题 There are 3 different ways to get data out of a BLOB column from a ResultSet getBytes getBinaryStream getBlob Also, the Blob object returned by getBlob also has getBytes and getBinaryStream methods available on it. Are there any particular reasons (performance, memory, database specific problems) that I should pick one over the other? The Blob object also has a free() call that has been introduced since JDBC 4.0. Does that make a difference? 回答1: If you're going to be pulling a lot of data (i

问题 I'm having issues dealing with the single quote while using it in a prepared statement in JAVA via Oracle JDBC. Let's say we have a table Restaurant with a column restaurant_name with 1 value : Jack's Deli I want to use a simple prepared statement query like this: String result = "Jack\'\'s Deli" String sqlStatement = "select * from Restaurant where restauraunt_name like ? escape '\\' "; PreparedStatement pStmt = conn.prepareStatement(sqlStatement); pstmt.setString(1, result); The result

问题 I'm having issues dealing with the single quote while using it in a prepared statement in JAVA via Oracle JDBC. Let's say we have a table Restaurant with a column restaurant_name with 1 value : Jack's Deli I want to use a simple prepared statement query like this: String result = "Jack\'\'s Deli" String sqlStatement = "select * from Restaurant where restauraunt_name like ? escape '\\' "; PreparedStatement pStmt = conn.prepareStatement(sqlStatement); pstmt.setString(1, result); The result

问题 I'm having issues dealing with the single quote while using it in a prepared statement in JAVA via Oracle JDBC. Let's say we have a table Restaurant with a column restaurant_name with 1 value : Jack's Deli I want to use a simple prepared statement query like this: String result = "Jack\'\'s Deli" String sqlStatement = "select * from Restaurant where restauraunt_name like ? escape '\\' "; PreparedStatement pStmt = conn.prepareStatement(sqlStatement); pstmt.setString(1, result); The result

问题 There is a VERY similar question to mine but in my case I don't have any duplicate jars in my build path, so the solution does not work for me. I've searched google for a couple of hours now, but none of the solutions I've found there actually resolve my issue. I'm creating a web site with some database connectivity for a homework. I'm using a MySQL database, developing in Eclipse and running on Windows. I keep getting java.lang.ClassNotFoundException: com.mysql.jdbc.Driver with the following

问题 There is a VERY similar question to mine but in my case I don't have any duplicate jars in my build path, so the solution does not work for me. I've searched google for a couple of hours now, but none of the solutions I've found there actually resolve my issue. I'm creating a web site with some database connectivity for a homework. I'm using a MySQL database, developing in Eclipse and running on Windows. I keep getting java.lang.ClassNotFoundException: com.mysql.jdbc.Driver with the following

问题 I am trying to connect a MS SQL server with jdbc driver. I am getting below error; Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall I think there is a problem with my connection URL. Here is my connection URL; jdbc:sqlserver://50.50.50.50\MYINSTANCE:1433; EDIT: I can connect this sql server with some client application(HeidiSQL

问题 I have an Oracle connection (in a java.sql.Connection object) that is mounted from a properties file (ApplicationResources.properties). How do I capture information about host, port, sid, user and password? (I need this information to call a specific database function through my java application) Below my code: private void conectaBanco() { ServiceLocator sl = new ServiceLocator(); InitialContext ic = null; DataSource dataSource = null; try { if (conn == null) { ic = new InitialContext();

问题 I am trying to run a query / select statement and save it in a variable. I know how to get something specific from a specific column but not from counting rows. This is working as I getting MYID specifically. ResultSet MYIDrs = stmtCFG.executeQuery( "SELECT rowid, MYID from MYINDEX order by rowid desc limit 1;" ); MYID = MYIDrs.getString("MYID"); Now I am trying to count the rows that works in SQLite client but not in the jdbc as I can't figure out what to request. this is what I have but is

问题 My original environment is SQL server 2005 + WebSphere v6.0(JDBC 3.0) . When I run the program as below and it works well. ResultSet rs=stmt.executeQuery(sql); rs.next(); However, when I upgrade the environment to SQL server 2005 + WebSphere v8.5(JDBC 4.0) , I get the error message: com.microsoft.sqlserver.jdbc.SQLServerException: The statement did not return a result set. From this forum's information, it seems that I have multiple resultsets, so I try to change the program as follows and it