resultset column count

5-resultset This overview is taken from jdbctm database access from javatm: a tutorial and annotated reference. Javasoft is currently preparing this book. This is a tutorial and an important reference manual for JDBC, which will be published by

With JDBC (including Oracle jdbc extensions), there is no direct (or standard) method to use ResultSet or RowSet to get the number of rows returned by the query. However, you can use scrollable ResultSet or Cached RowSet with very few lines of code

Detailed description of the Java resultset Interface Record set Interface In jdbc api 2.0, the resultset interface has changed a lot, adding a lot of new methods for Row Operations and row location, with strong functionality The major changes are

The resultset API in JDBC does not directly obtain the number of records. Here we will introduce several methods: Method 1: Use the getrow method of resultset to obtain the total number of rows of resultset. Java code: resultset RS; RS. last (); //

The principle is to store a single piece of data with map and put it in the list.In this way, you can call list = Rs. selectrs (sqlstr );For (INT I = 0; I {(MAP) list. Get (I). Get ("username ");}In this way, you do not need to write database

Tag: exec count () performs a span by querying the specified send NECDriverManager (basic service for managing a set of JDBC drivers)It's method: getConnection(String url, String user, String password) .Connection (connection to a specific

Important NOTE: this part of the article is the owner of the collection from the Internet, and if you think that the content of the document violates your rights, please contact the collation (excelarthur@yahoo.com.cn), and Dev2dev site has nothing

PHP Tutorial Introduction: three MySQL + SQLite + pdo php database classes are supported at the same time: // mysqlconnect $ db = newSQL (mysql: host = localhost; database = 21andy_blog;, 21andy.com _ user, 21andy.com _ passwo   PHP Tutorial

PHP tutorial Introduction: Three MySQL + SQLite + pdo php database classes are supported at the same time: // mysql connect $ db = new SQL (mysql: host = localhost; database = 21andy_blog;, 21andy.com _ user, 21andy.com _ password); // PDO SQLite3

PHP Learning Tutorial Article Introduction: also supports three mysql+sqlite+pdo PHP database class use method://mysql Connect $db = new SQL (mysql:host=localhost;database=21andy_ blog;, 21andy.com_user, 21andy.com_password); PDO SQLite3 Connect $db