JDBC batch processing and JDBC Batch Processing

JDBC batch processing and JDBC Batch Processing

 

JDBC batch processing:

1) Batch Processing: process a large amount of data at a time.
Explanation: Sometimes you need to send a batch of SQL statements to the database for execution. In this case, you should avoid sending and executing SQL statements to the database,

The JDBC batch processing mechanism should be adopted to improve the execution efficiency.
2) two methods:
Statement: // Statement stat = conn. createStatement (); Create Statement
Stat. addBatch (SQL): Fill in the buffer to compile the SQL statement.
Stat.exe cuteBatch (): one-time execution of data in the buffer zone.
PreparedStatement: // PreparedStatement ps = conn. prepareStatement (SQL );
Ps. addBatch (): Put the parameter into the placeholder? Stored in the cache.
Ps.exe cuteBatch (): one-time execution of data in the cache.
3) case:
Insert 1070 data records into the table bank_money.

 

1) @ Test public void testStatement () {Connection conn = null; try {conn = DBUtil2.getconn (); Statement stat = conn. createStatement (); long l1 = System. currentTimeMillis (); for (int I = 10; I <1080; I ++) {String SQL = "insert into login_info values (" + I + ", 'zs ', '20140901') "; stat. addBatch (SQL); // enter SQL in the buffer for compilation. Stat.exe cuteQuery (SQL);} stat.exe cuteBatch (); //: one-time execution of data in the buffer zone. Long l2 = System. currentTimeMillis (); System. out. println (l2-l1);} catch (Exception e) {e. printStackTrace () ;}} 2) @ Test public void testPreparedStatement () {Connection conn = null; try {conn = DBUtil2.getconn (); string SQL = "insert into login_info values (?,?,?) "; PreparedStatement ps = conn. prepareStatement (SQL); long l1 = System. currentTimeMillis (); for (int I = 10; I <1080; I ++) {ps. setInt (1, I); ps. setString (2, "zs"); ps. setString (3, "111111"); ps. addBatch (); // Add a parameter to a placeholder? If (I % 100 = 0) {ps.exe cuteBatch (); // the data in the cache is executed once every 100 times .,} Ps.exe cuteBatch (); // execute long l2 = System once for the buffer data. currentTimeMillis (); System. out. println (l2-l1);} catch (Exception e) {e. printStackTrace () ;}finally {DBUtil2.colseconn (conn) ;}} 3) public class DBUtil2 {private static String driver; private static String url; private static String user; private static String pwd; /** to read the configuration file, you only need to load the configuration file once */static {try {// read the content from the db file/* The current file path is under the project name by default. * "Db. properties "*: Read the configuration file */FileReader fr = new FileReader (" db. properties "); Properties prop = new Properties (); prop. load (fr); driver = prop. getProperty ("driver"); url = prop. getProperty ("url"); user = prop. getProperty ("user"); pwd = prop. getProperty ("pwd"); Class. forName (driver); // 1 load driver} catch (Exception e) {e. printStackTrace ();/* "db. properties: driver = oracle. jdbc. driver. oracleDriver # Driver = oracle. jdbc. oracleDriver url = jdbc: oracle: thin: @ localhost: 1521: orcl user = scott pwd = 1234 **/} public static Connection getconn () {// 2. establish Connection conn = null; try {conn = DriverManager. getConnection (url, user, pwd);} catch (Exception e) {e. printStackTrace ();} return conn;} public static void colseconn (Connection conn) {try {if (conn! = Null) {conn. close () ;}} catch (Exception e) {e. printStackTrace () ;}} public static void main (String [] args) {System. out. println (getconn (); // return the connection object }}