hive jdbc example

Label:JDBC (Java Data Base Connectivity,java database connection) is a Java API for executing SQL statements that provides unified access to a variety of relational databases, consisting of a set of classes and interfaces written in the Java language. JDBC provides a benchmark to build more advanced tools and interfaces that enable database developers to write database applications.If you want to use the database to add the driver of the database, dif

object atStatement st =con.createstatement (); - //4. Execute SQL statements -String sql= "Select *from user";//querying all the information of the user table -ResultSet rs = st.executequery (SQL);//return result set after query - //5. Print out the results - while(Rs.next ()) { inSystem.out.println (rs.getstring ("Id") + "\ T" +rs.getstring ("name") + "\ T" +rs.getstring ("password"));} } toRs.close ();//Close Resource +Con.close (

= "JdbcTemplate" /> Property> Bean>Beans>----------------------------------------------------------------------------------------Step two:Com.maggie.util.JdbcUtil.java class file:class= "Org.springframework.jdbc.datasource.DriverManagerDataSource" destroy-method= "Close" >////class= "Org.springframework.jdbc.core.JdbcTemplate" > class= "Com.maggie.util.JdbcUtil" > ----------------------------------------------------------------------------------------Step Three: Test the class: Package

(exception Fe ){ // To do nothing } Returnnull; } Publicjava. Io. printwriter getlogwriter () throws sqlexception { // Vendor Specific Code goes here Return NULL; } Publicvoid setlogwriter (Java. Io. printwriter out) throws sqlexception { // Vendor Specific Code goes here } Publicvoid setlogintimeout (INT seconds) throws sqlexception { // Vendor Specific Code goes here } Publicint getlogintimeout () throws sqlexception { Return1; // Vendor Specific Code goes here } Privatestring servername = NU

Tags: simulating banking system Database JDBC transactionThis article is a functional extension of the example of a transaction in the previous article to deepen understanding and code proficiency:(1) Database tablesData:(2) Introduction of database connection Jar Package(3) Tool type:Package Org.jdbc.util;import Java.io.file;import Java.io.fileinputstream;import java.io.inputstream;import Java.sql.connecti

blockE.printstacktrace ();}}}4, this class is used for testing PreparedStatement, transactions, etc., in order to make the program easy, here another main function to testImport java.sql.Connection;Import Java.sql.Date;Import java.sql.PreparedStatement;Import java.sql.SQLException;Import Com.jdbc.utils.Utils;public class Sessiondome {/*** @param args*/public static void Main (string[] args) {TODO auto-generated method stubsConnection Con=null;PreparedStatement Statement=null;try {Getting connec

Label:Java Connection to Oracle database JDBC (Java Data Base Connectivity,java database connection), then how do we use Java to connect the database? importjava.sql.connection; importjava.sql.drivermanager; importjava.sql.preparedstatement; importjava.sql.resultset; importjava.sql.sqlexception; publicclassjdbc{Publicstaticvoidmain (String[]args) {//1. Importing jar Packages Project name---->buidpath----->adde~//2. Load driver try{class.forname (" O

Label:Implemented on the basis of the JDBC simple packagepublic class userdao{public static void Testgetuser (String userName) throws exception{Connection Conn=null;PreparedStatement preparedstatement=null;//statement Change to PreparedStatementResultSet Resultset=null;try{Conn=jdbcutils.getconnetcion ();Parameterization of query statements to prevent SQL injectionString sql= "SELECT * from user where username=?";Preparedstatement=conn.preparestatemen

Statement: The material used in this column is written by the VIP students of the Kay Academy, who has the right to be anonymous and has the final right to interpret the article; The Edith Academy is designed to promote students to learn from each other on the basis of public notes.JDBC Comprehensive ExampleThis comprehensive example is the use of JDBC to the database table to increase, delete, check, chang

of records affected by this operation. NBSP;2, the result of executing a query returns a resThe Ultset object. ?resultset contains all rows that conform to the conditions in the SQL statement, and it provides access to the data in those rows through a set of Get methods. ? get data using the access method of the result set (ResultSet) object://while (Rs.next ()) {//stringname= Rs.getstring ("name") ;//stringpass=rs.getstring (1) ;// This method is more efficient// }// (column is numbered from l

= "true"/> Propertyname= "Slowsqlmillis"value= "${jdbc.slowsqlmillis}"/> Propertyname= "Logslowsql"value= "true"/> Bean> List> Property> Bean> BeanID= "TransactionManager"class= "Org.springframework.jdbc.datasource.DataSourceTransactionManager"> Propertyname= "DataSource"ref= "DataSource"/> Bean> Tx:annotation-driven/>Beans>Seven, testing public static void main (string[] args) {applicationcontext c

JDBC-development Example-MVC pattern1. Configure the connection database information in Web. xmlWeb. xml:2. Data layer-Create entity class Student.java　　Student.java:Package gh.test.entity;　　public class student{private int id;private String name;private int gender;private int age;Private String address;Private String Tel;public void setId (int id) {//study numberThis.id = ID;}public int getId () {return ID

; } Public Integer Getage () {return age ; } public void Setage (Integer age) { this.age = age; } Public Integer GetId () {return ID; } public void SetId (Integer id) { this.id = ID; } Public String GetName () {return name; } public void SetName (String name) { this.name = name; } Public String Getpass () {return pass ; } public void SetPass (String pass) { this.pass = pass; } } A good practice is to provide a default null c

18/1/16 In the SPRINGMVC (13): Using SPRINGMVC to optimize the order management System example (login and logout of the simple implementation), to the "Supermarket order management system" to add a new function: User management function (jump all user queries and conditional user query); Learning stage, so the use of the framework: SPRINGMVC + spring + JDBC, added user query function, but the paging functio

); System.out.println (ID+ "+ name +" "+email); } } Catch(Exception e) {e.printstacktrace (); } finally{dbutil.close (conn); System.out.println ("-----Done-----"); } //PreparedStatement Insert asql = "INSERT into CUSTOMERTBL (name, email) values (?,?)"; Conn=Dbutil.open (); Try{pstmt=conn.preparestatement (SQL); Pstmt.setstring (1, "Amy"); Pstmt.setstring (2, "[Email protected]"); Pstmt.executeupdate (); } Catch(Exception e) {e.printstacktrace (); } finally{dbutil.close (con

//ResultSet rs= ps.executequery (); Traversal//Rtn=rs.next ();//If there is data to verify through//supplemental knowledge//Call stored procedure//CallableStatement Cs=conn.preparecall ("{ Call stored procedure name (?,?)} "); Get information about the database DatabaseMetaData dm= conn.getmetadata (); System.out.println ("Url=" +dm.geturl ()); System. OUT.PRINTLN ("name =" +dm.getusername ()); SYSTEM.OUT.PRINTLN ("Product name =" +dm.getdatabaseproductname ()); Metada

; +ResultSetMetaData Rsmetadata =Resultset.getmetadata (); - for(inti = 1; I ) { theSystem.out.printf ("%-8s\t", Rsmetadata.getcolumnname (i)); * } $ System.out.println ();Panax Notoginseng - //print attribute values; the while(Resultset.next ()) { + for(inti = 1; I ) { ASystem.out.printf ("%-12s\t", resultset.getstring (i)); the } + System.out.println (); - } $ $ //close the database connection; (Connecting the databas

//Error statement: There is a syntax error near the keyword ' user '; - //user is the keyword in the SQL statement, if you want to use user as the table name, you must enclose the user in square brackets [], that is [user]; to + //processing result sets (including metadata); - //Print property name; theResultSetMetaData Rsmetadata =Resultset.getmetadata (); * for(inti = 1; I ) { $System.out.printf ("%-8s\t", Rsmetadata.getcolumnname (i));Panax N

:" +Age ); $System.out.print (", Author:" +author); -System.out.println (", Represent:" +represent); - } the rs.close (); - stmt.close ();Wuyi conn.close (); the}Catch(SQLException se) { - se.printstacktrace (); Wu}Catch(Exception e) { - e.printstacktrace (); About}finally{ $ Try{ - if(stmt!=NULL) - stmt.close (); -}Catch(SQLException se2) { A } + Try{ the if(conn!=NULL) - conn.close (); $}Catch(SQLException se) { the se.printstacktrace (); the } the

, Filteredrowset, Jdbcrowset, Joinrowset, RowSet, Syncresolver, Webrowset ResultSetextends Wrapper A data table that represents a database result set, typically generated by executing statements that query the database. 　　Six, the question of thinking1. Each SQL operation needs to establish and close the connection, which is bound to consume a lot of resource overhead, how to avoid? Analysis: You can use a connection pool to maintain a unified connection without having to