The JdbcTemplate a custom (CRUD tables in a database record)

demand:

• JdbcTemplate a custom template, functional additions and deletions to the database table records

  . 1  Package demo03;
   2  
  . 3  Import utils.JDBC_DBCP_Utils;
   . 4  
  . 5  Import the javax.sql.DataSource;
   . 6  Import the java.sql.Connection;
   . 7  Import java.sql.ParameterMetaData;
   . 8  Import java.sql.PreparedStatement;
   . 9  Import the java.sql. SQLException;
   10  
  . 11  public  class MyJDBCTemplate {
   12 is      // 1. need to pass the data source 
  13 is      Private the dataSource the dataSource;
   14  
  15      // constructor 
  16      publicMyJDBCTemplate (the DataSource the dataSource) {
   . 17          the this .DataSource = the dataSource;
   18 is      }
   . 19  
  20 is      / ** 
  21 is       * a step of encapsulating + JDBC database operation metadata, the release of resources (the user does not release the resource of interest)
   22       * add, delete, modify
   23 is       *
   24       * @param SQL SQL statement
   25       * @param the params parameter
   26 is       * @return the Ctrl + the Alt + T
   27       * / 
  28      public  int Update (SQL String, Object ... the params) {
   29          Connection Connection = null ;
   30         = The preparedStatement the PreparedStatement null ;
   31 is          the try {
   32              // of 0. The non-empty judgment 
  33 is              IF (the dataSource == null ) the throw  new new a RuntimeException ( "Not null the dataSource MUST ..." );
   34 is  
  35              IF (SQL == null ) the throw  new new a RuntimeException ( "Not null sql MUST ..." );
   36  
  37 [              // 1. connection object obtained from the dataSource 
  38 is              connection = dataSource.getConnection ();
   39              // 2. Create Object precompiled sql statement insert into user values ( ?,?,?,?)
  40              the preparedStatement = Connection.prepareStatement (SQL);
   41 is  
  42 is              // 3. metadata objects obtained parameter 
  43 is              ParameterMetaData An ParameterMetaData = preparedStatement.getParameterMetaData ();
   44 is              // 4. number of the parameters obtained in 
  45              int parameterCount = parameterMetaData.getParameterCount ( );
   46 is  
  47              // 5 to each assignment? 
  48              for ( int I = 0; I <parameterCount; I ++ ) {
   49                  PreparedStatement.setObject (I +. 1 , the params [I]);
   50              }
   51 is  
  52 is             //6. 执行
  53             int i = preparedStatement.executeUpdate();
  54             return i;
  55         } catch (SQLException e) {
  56             e.printStackTrace();
  57         } finally {
  58             //释放资源
  59             JDBC_DBCP_Utils.release(null, preparedStatement, connection);
  60         }
  61         return -1;
  62     }
  63 }