create table users_ning(id primary key auto_increment,pwd int); insert into users_ning values(id,1234); insert into users_ning values(id,12345); insert into users_ning values(id,12); insert into users_ning values(id,123); CREATE PROCEDURE login_ning(IN p_id int,IN p_pwd int,OUT flag int)BEGINDECLARE v_pwd int; select pwd INTO v_pwd from users_ning where id = p_id; if v_pwd = p_pwd then set flag:=1; else select v_pwd; set flag := 0; end if;END package demo20130528;import java.sql.*;import demo20130526.DBUtils;/** * 测试JDBC API调用过程 * @author tarena * */public class ProcedureDemo2 { /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { System.out.println(login(123, 1234)); } /** * 调用过程,实现登录功能 * @param id 考生id * @param pwd 考试密码 * @return if成功:1; if密码错:0; if没有用户:-1 * @throws Exception */ public static int login(int id, int pwd) throws Exception{ int flag = -1; String sql = "{call login_ning(?,?,?)}";//***** Connection conn = DBUtils.getConnMySQL(); CallableStatement stmt = null; try{ stmt = conn.prepareCall(sql); //传递输入参数 stmt.setInt(1, id); stmt.setInt(2, pwd); //注册输出参数,第三个占位符的数据类型是整型 stmt.registerOutParameter(3, Types.INTEGER);//***** //执行过程 stmt.execute(); //获得过程执行后的输出参数 flag = stmt.getInt(3);//***** }catch(Exception e){ e.printStackTrace(); }finally{ stmt.close(); DBUtils.dbClose(); } return flag; }}
package demo20130526;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.sql.Connection;import java.sql.DatabaseMetaData;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;public class DBUtils {<span style="white-space:pre"> </span>static Connection conn = null;<span style="white-space:pre"> </span>static PreparedStatement stmt = null;<span style="white-space:pre"> </span>static ResultSet rs = null;<span style="white-space:pre"> </span>static Statement st = null;<span style="white-space:pre"> </span>static String username = null;<span style="white-space:pre"> </span>static String password = null;<span style="white-space:pre"> </span>static String url = null;<span style="white-space:pre"> </span>static String driverName = null;<span style="white-space:pre"> </span>public static Connection getConnMySQL() throws Exception {// 连接mysql 返回conn<span style="white-space:pre"> </span>getUrlUserNamePassWordClassNameMySQL();<span style="white-space:pre"> </span>conn = DriverManager.getConnection(url, username, password);<span style="white-space:pre"> </span>// conn.setAutoCommit(false);设置自动提交为false<span style="white-space:pre"> </span>return conn;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static Connection getConnORCALE() throws Exception {// 连接orcale<span style="white-space:pre"> </span>// 返回conn<span style="white-space:pre"> </span>getUrlUserNamePassWordClassNameORCALE();<span style="white-space:pre"> </span>conn = DriverManager.getConnection(url, username, password);<span style="white-space:pre"> </span>// conn.setAutoCommit(false);<span style="white-space:pre"> </span>return conn;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>private static void getUrlUserNamePassWordClassNameORCALE()<span style="white-space:pre"> </span>throws Exception {<span style="white-space:pre"> </span>// 从资源文件 获取 orcale的username password url等信息<span style="white-space:pre"> </span>Properties pro = new Properties();<span style="white-space:pre"> </span>File path = new File("src/all.properties");<span style="white-space:pre"> </span>pro.load(new FileInputStream(path));<span style="white-space:pre"> </span>String paths = pro.getProperty("filepath");<span style="white-space:pre"> </span>File file = new File(paths + "orcale.properties");<span style="white-space:pre"> </span>getFromProperties(file);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getUrlUserNamePassWordClassNameMySQL() throws Exception {<span style="white-space:pre"> </span>// 从资源文件 获取mysql的username password url等信息<span style="white-space:pre"> </span>Properties pro = new Properties();<span style="white-space:pre"> </span>File path = new File("src/all.properties");<span style="white-space:pre"> </span>pro.load(new FileInputStream(path));<span style="white-space:pre"> </span>String paths = pro.getProperty("filepath");<span style="white-space:pre"> </span>File file = new File(paths + "mysql.properties");<span style="white-space:pre"> </span>getFromProperties(file);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getFromProperties(File file) throws IOException,<span style="white-space:pre"> </span>FileNotFoundException, ClassNotFoundException {// 读资源文件的内容<span style="white-space:pre"> </span>Properties pro = new Properties();<span style="white-space:pre"> </span>pro.load(new FileInputStream(file));<span style="white-space:pre"> </span>username = pro.getProperty("username");<span style="white-space:pre"> </span>password = pro.getProperty("password");<span style="white-space:pre"> </span>url = pro.getProperty("url");<span style="white-space:pre"> </span>driverName = pro.getProperty("driverName");<span style="white-space:pre"> </span>Class.forName(driverName);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void dbClose() throws Exception {// 关闭所有<span style="white-space:pre"> </span>if (rs != null)<span style="white-space:pre"> </span>rs.close();<span style="white-space:pre"> </span>if (st != null)<span style="white-space:pre"> </span>st.close();<span style="white-space:pre"> </span>if (stmt != null)<span style="white-space:pre"> </span>stmt.close();<span style="white-space:pre"> </span>if (conn != null)<span style="white-space:pre"> </span>conn.close();<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static ResultSet getById(String tableName, int id) throws Exception {// 用id来查询结果<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>rs = st.executeQuery("select * from " + tableName + " where id=" + id<span style="white-space:pre"> </span>+ " ");<span style="white-space:pre"> </span>return rs;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static ResultSet getByAll(String sql, Object... obj)<span style="white-space:pre"> </span>throws Exception {// 用关键字 实现查询 关键字额可以任意<span style="white-space:pre"> </span>sql = sql.replaceAll(";", "");<span style="white-space:pre"> </span>sql = sql.trim();<span style="white-space:pre"> </span>stmt = conn.prepareStatement(sql);<span style="white-space:pre"> </span>String[] strs = sql.split("//?");// 将sql 以? 非开<span style="white-space:pre"> </span>int num = strs.length;// 得到?的个数<span style="white-space:pre"> </span>int size = obj.length;<span style="white-space:pre"> </span>for (int i = 1; i <= size; i++) {<span style="white-space:pre"> </span>stmt.setObject(i, obj[i - 1]);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>if (size < num) {<span style="white-space:pre"> </span>for (int k = size + 1; k <= num; k++) {<span style="white-space:pre"> </span>stmt.setObject(k, null);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>rs = stmt.executeQuery();<span style="white-space:pre"> </span>return rs;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void doInsert(String sql) throws SQLException {// 传入 sql 语句<span style="white-space:pre"> </span>// 实现插入操作<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>st.execute(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void doInsert(String sql, Object... args) throws Exception {// 传入参数<span style="white-space:pre"> </span>// 利用<span style="white-space:pre"> </span>// PreparedStatement<span style="white-space:pre"> </span>// 实现插入<span style="white-space:pre"> </span>// 传入的参数是任意多个 因为有Object 。。。args<span style="white-space:pre"> </span>int size = args.length;// 获得 Object ...obj 传过来的参数的个数<span style="white-space:pre"> </span>stmt = conn.prepareStatement(sql);<span style="white-space:pre"> </span>for (int i = 1; i <= size; i++) {<span style="white-space:pre"> </span>stmt.setObject(i, args[i - 1]);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>stmt.execute();<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static int doUpdate(String sql) throws Exception {// 传入 sql 实现更新操作<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>int num = st.executeUpdate(sql);<span style="white-space:pre"> </span>return num;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void doUpdate(String sql, Object... obj) throws Exception {<span style="white-space:pre"> </span>// 传入参数 利用 PreparedStatement实现更新<span style="white-space:pre"> </span>// 传入的参数是任意多个 因为有Object 。。。args<span style="white-space:pre"> </span>int size = obj.length;// 获得 Object ...obj 传过来的参数的个数<span style="white-space:pre"> </span>stmt = conn.prepareStatement(sql);<span style="white-space:pre"> </span>for (int i = 1; i <= size; i++) {<span style="white-space:pre"> </span>stmt.setObject(i, obj[i - 1]);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>stmt.executeUpdate(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static boolean doDeleteById(String tableName, int id)<span style="white-space:pre"> </span>throws SQLException {// 删除记录 by id<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>boolean b = st.execute("delete from " + tableName + " where id=" + id<span style="white-space:pre"> </span>+ "");<span style="white-space:pre"> </span>return b;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static boolean doDeleteByAll(String sql, Object... args)<span style="white-space:pre"> </span>throws SQLException {// 删除记录 可以按任何关键字<span style="white-space:pre"> </span>sql = sql.replaceAll(";", "");<span style="white-space:pre"> </span>sql = sql.trim();<span style="white-space:pre"> </span>stmt = conn.prepareStatement(sql);<span style="white-space:pre"> </span>String[] strs = sql.split("//?");// 将sql 以? 非开<span style="white-space:pre"> </span>int num = strs.length;// 得到?的个数<span style="white-space:pre"> </span>int size = args.length;<span style="white-space:pre"> </span>for (int i = 1; i <= size; i++) {<span style="white-space:pre"> </span>stmt.setObject(i, args[i - 1]);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>if (size < num) {<span style="white-space:pre"> </span>for (int k = size + 1; k <= num; k++) {<span style="white-space:pre"> </span>stmt.setObject(k, null);// 数组下标从0开始<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>boolean b = stmt.execute();<span style="white-space:pre"> </span>return b;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getMetaDate() throws Exception {// 获取数据库元素数据<span style="white-space:pre"> </span>conn = DBUtils.getConnORCALE();<span style="white-space:pre"> </span>DatabaseMetaData dmd = conn.getMetaData();<span style="white-space:pre"> </span>System.out.println(dmd.getDatabaseMajorVersion());<span style="white-space:pre"> </span>System.out.println(dmd.getDatabaseProductName());<span style="white-space:pre"> </span>System.out.println(dmd.getDatabaseProductVersion());<span style="white-space:pre"> </span>System.out.println(dmd.getDatabaseMinorVersion());<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static String[] getColumnNamesFromMySQL(String sql) throws Exception {<span style="white-space:pre"> </span>conn = DBUtils.getConnMySQL();<span style="white-space:pre"> </span>return getColumnName(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static String[] getColumnNamesFromOrcale(String sql)<span style="white-space:pre"> </span>throws Exception {<span style="white-space:pre"> </span>conn = DBUtils.getConnORCALE();<span style="white-space:pre"> </span>return getColumnName(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>private static String[] getColumnName(String sql) throws Exception {// 返回表中所有的列名<span style="white-space:pre"> </span>conn = DBUtils.getConnORCALE();<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>rs = st.executeQuery(sql);<span style="white-space:pre"> </span>ResultSetMetaData rsmd = rs.getMetaData();<span style="white-space:pre"> </span>int num = rsmd.getColumnCount();<span style="white-space:pre"> </span>System.out.println("ColumnCount=" + num);<span style="white-space:pre"> </span>String[] strs = new String[num];<span style="white-space:pre"> </span>// 显示列名<span style="white-space:pre"> </span>for (int i = 1; i <= rsmd.getColumnCount(); i++) {<span style="white-space:pre"> </span>String str = rsmd.getColumnName(i);<span style="white-space:pre"> </span>strs[i - 1] = str;<span style="white-space:pre"> </span>System.out.print(str + "/t");<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>return strs;<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getColumnDataFromMySQL(String sql) throws Exception {// 输出表中的数据<span style="white-space:pre"> </span>conn = DBUtils.getConnMySQL();<span style="white-space:pre"> </span>getColumnData(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getColumnDataFromORCALEL(String sql) throws Exception {// 输出表中的数据<span style="white-space:pre"> </span>conn = DBUtils.getConnORCALE();<span style="white-space:pre"> </span>getColumnData(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getColumnData(String sql) throws Exception {// 输出表中的数据<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>rs = st.executeQuery(sql);<span style="white-space:pre"> </span>ResultSetMetaData rsmd = rs.getMetaData();<span style="white-space:pre"> </span>System.out<span style="white-space:pre"> </span>.println("/n------------------------------------------------------------------------------------------------------------------------");<span style="white-space:pre"> </span>while (rs.next()) {<span style="white-space:pre"> </span>for (int i = 1; i <= rsmd.getColumnCount(); i++) {<span style="white-space:pre"> </span>System.out.print(rs.getString(i) + "/t");<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>System.out.println();<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>System.out<span style="white-space:pre"> </span>.println("------------------------------------------------------------------------------------------------------------------------");<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getTableDataFromOrcale(String sql) throws Exception {// 输出表的列名<span style="white-space:pre"> </span>// 和表中的全部数据<span style="white-space:pre"> </span>conn = DBUtils.getConnORCALE();<span style="white-space:pre"> </span>getTableData(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>public static void getTableDataFromMysql(String sql) throws Exception {// 输出表的列名<span style="white-space:pre"> </span>// 和表中的全部数据<span style="white-space:pre"> </span>conn = DBUtils.getConnMySQL();<span style="white-space:pre"> </span>getTableData(sql);<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>private static void getTableData(String sql) throws SQLException {<span style="white-space:pre"> </span>// getTableDataFromMysql<span style="white-space:pre"> </span>// getTableDataFromOrcale<span style="white-space:pre"> </span>st = conn.createStatement();<span style="white-space:pre"> </span>rs = st.executeQuery(sql);<span style="white-space:pre"> </span>ResultSetMetaData rsmd = rs.getMetaData();<span style="white-space:pre"> </span>int num = rsmd.getColumnCount();<span style="white-space:pre"> </span>System.out.println("ColumnCount=" + num);<span style="white-space:pre"> </span>String[] strs = new String[num];<span style="white-space:pre"> </span>// 显示列名<span style="white-space:pre"> </span>for (int i = 1; i <= rsmd.getColumnCount(); i++) {<span style="white-space:pre"> </span>String str = rsmd.getColumnName(i);<span style="white-space:pre"> </span>strs[i - 1] = str;<span style="white-space:pre"> </span>System.out.print(str + "/t");<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>System.out<span style="white-space:pre"> </span>.println("/n------------------------------------------------------------------------------------------------------------------------");<span style="white-space:pre"> </span>while (rs.next()) {<span style="white-space:pre"> </span>for (int i = 1; i <= rsmd.getColumnCount(); i++) {<span style="white-space:pre"> </span>System.out.print(rs.getString(i) + "/t");<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>System.out.println();<span style="white-space:pre"> </span>}<span style="white-space:pre"> </span>System.out<span style="white-space:pre"> </span>.println("------------------------------------------------------------------------------------------------------------------------");<span style="white-space:pre"> </span>}}
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MySQL's Role: Databases in Web ApplicationsApr 17, 2025 am 12:23 AMThe main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.
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