数据库|mysql教程
数据库-mysql教程
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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);CREATEPROCEDURE login_ning(IN p_id int,IN p_pwd int,OUT flag int)BEGINDECLAREv_pwd int;select pwd INTO v_pwd from users_ningwhere id = p_id; if v_pwd = p_pwd thenset flag:=1;else select v_pwd;set flag := 0;end if;END package demo0528;import java.sql.*;import demo0526.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 demo0526;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 {static Connection conn = null;static PreparedStatement stmt = null;static ResultSet rs = null;static Statement st = null;static String username = null;static String password = null;static String url = null;static String driverName = null;public static Connection getConnMySQL() throws Exception {// 连接mysql 返回conngetUrlUserNamePassWordClassNameMySQL();conn = DriverManager.getConnection(url, username, password);// conn.setAutoCommit(false);设置自动提交为falsereturn conn;}public static Connection getConnORCALE() throws Exception {// 连接orcale// 返回conngetUrlUserNamePassWordClassNameORCALE();conn = DriverManager.getConnection(url, username, password);// conn.setAutoCommit(false);return conn;}private static void getUrlUserNamePassWordClassNameORCALE()throws Exception {// 从资源文件 获取 orcale的username password url等信息Properties pro = new Properties();File path = new File("src/all.properties");pro.load(new FileInputStream(path));String paths = pro.getProperty("filepath");File file = new File(paths + "orcale.properties");getFromProperties(file);}public static void getUrlUserNamePassWordClassNameMySQL() throws Exception {// 从资源文件 获取mysql的username password url等信息Properties pro = new Properties();File path = new File("src/all.properties");pro.load(new FileInputStream(path));String paths = pro.getProperty("filepath");File file = new File(paths + "mysql.properties");getFromProperties(file);}public static void getFromProperties(File file) throws IOException,FileNotFoundException, ClassNotFoundException {// 读资源文件的内容Properties pro = new Properties();pro.load(new FileInputStream(file));username = pro.getProperty("username");password = pro.getProperty("password");url = pro.getProperty("url");driverName = pro.getProperty("driverName");Class.forName(driverName);}public static void dbClose() throws Exception {// 关闭所有if (rs != null)rs.close();if (st != null)st.close();if (stmt != null)stmt.close();if (conn != null)conn.close();}public static ResultSet getById(String tableName, int id) throws Exception {// 用id来查询结果st = conn.createStatement();rs = st.executeQuery("select * from " + tableName + "where ");return rs;}public static ResultSet getByAll(String sql, Object... obj)throws Exception {// 用关键字 实现查询 关键字额可以任意sql = sql.replaceAll(";", "");sql = sql.trim();stmt = conn.prepareStatement(sql);String[] strs = sql.split("//?");// 将sql 以? 非开int num = strs.length;// 得到?的个数int size = obj.length;for (int i = 1; i <= size; i++) {stmt.setObject(i, obj[i - 1]);// 数组下标从0开始}if (size < num) {for (int k = size + 1; k <= num; k++) {stmt.setObject(k, null);// 数组下标从0开始}}rs = stmt.executeQuery();return rs;}public static void doInsert(String sql) throws SQLException {// 传入 sql 语句// 实现插入操作st = conn.createStatement();st.execute(sql);}public static void doInsert(String sql, Object... args) throws Exception {// 传入参数// 利用// PreparedStatement// 实现插入// 传入的参数是任意多个 因为有Object 。。。argsint size = args.length;// 获得 Object ...obj 传过来的参数的个数stmt = conn.prepareStatement(sql);for (int i = 1; i <= size; i++) {stmt.setObject(i, args[i - 1]);// 数组下标从0开始}stmt.execute();}public static int doUpdate(String sql) throws Exception {// 传入 sql 实现更新操作st = conn.createStatement();int num = st.executeUpdate(sql);return num;}public static void doUpdate(String sql, Object... obj) throws Exception {// 传入参数 利用 PreparedStatement实现更新// 传入的参数是任意多个 因为有Object 。。。argsint size = obj.length;// 获得 Object ...obj 传过来的参数的个数stmt = conn.prepareStatement(sql);for (int i = 1; i <= size; i++) {stmt.setObject(i, obj[i - 1]);// 数组下标从0开始}stmt.executeUpdate(sql);}public static boolean doDeleteById(String tableName, int id)throws SQLException {// 删除记录 by idst = conn.createStatement();boolean b = st.execute("delete from " + tableName + " where");return b;}public static boolean doDeleteByAll(String sql, Object... args)throws SQLException {// 删除记录 可以按任何关键字sql = sql.replaceAll(";", "");sql = sql.trim();stmt = conn.prepareStatement(sql);String[] strs = sql.split("//?");// 将sql 以? 非开int num = strs.length;// 得到?的个数int size = args.length;for (int i = 1; i <= size; i++) {stmt.setObject(i, args[i - 1]);// 数组下标从0开始}if (size < num) {for (int k = size + 1; k <= num; k++) {stmt.setObject(k, null);// 数组下标从0开始}}boolean b = stmt.execute();return b;}public static void getMetaDate() throws Exception {// 获取数据库元素数据conn = DBUtils.getConnORCALE();DatabaseMetaData dmd = conn.getMetaData();System.out.println(dmd.getDatabaseMajorVersion());System.out.println(dmd.getDatabaseProductName());System.out.println(dmd.getDatabaseProductVersion());System.out.println(dmd.getDatabaseMinorVersion());}public static String[] getColumnNamesFromMySQL(String sql) throws Exception {conn = DBUtils.getConnMySQL();return getColumnName(sql);}public static String[] getColumnNamesFromOrcale(String sql)throws Exception {conn = DBUtils.getConnORCALE();return getColumnName(sql);}private static String[] getColumnName(String sql) throws Exception {// 返回表中所有的列名conn = DBUtils.getConnORCALE();st = conn.createStatement();rs = st.executeQuery(sql);ResultSetMetaData rsmd = rs.getMetaData();int num = rsmd.getColumnCount();System.out.println("ColumnCount=" + num);String[] strs = new String[num];// 显示列名for (int i = 1; i <= rsmd.getColumnCount(); i++) {String str = rsmd.getColumnName(i);strs[i - 1] = str;System.out.print(str + "/t");}return strs;}public static void getColumnDataFromMySQL(String sql) throws Exception {// 输出表中的数据conn = DBUtils.getConnMySQL();getColumnData(sql);}public static void getColumnDataFromORCALEL(String sql) throws Exception {// 输出表中的数据conn = DBUtils.getConnORCALE();getColumnData(sql);}public static void getColumnData(String sql) throws Exception {// 输出表中的数据st = conn.createStatement();rs = st.executeQuery(sql);ResultSetMetaData rsmd = rs.getMetaData();System.out.println("/n------------------------------------------------------------------------------------------------------------------------");while (rs.next()) {for (int i = 1; i <= rsmd.getColumnCount(); i++) {System.out.print(rs.getString(i) + "/t");}System.out.println();}System.out.println("------------------------------------------------------------------------------------------------------------------------");}public static void getTableDataFromOrcale(String sql) throws Exception {// 输出表的列名// 和表中的全部数据conn = DBUtils.getConnORCALE();getTableData(sql);}public static void getTableDataFromMysql(String sql) throws Exception {// 输出表的列名// 和表中的全部数据conn = DBUtils.getConnMySQL();getTableData(sql);}private static void getTableData(String sql) throws SQLException {// getTableDataFromMysql// getTableDataFromOrcalest = conn.createStatement();rs = st.executeQuery(sql);ResultSetMetaData rsmd = rs.getMetaData();int num = rsmd.getColumnCount();System.out.println("ColumnCount=" + num);String[] strs = new String[num];// 显示列名for (int i = 1; i <= rsmd.getColumnCount(); i++) {String str = rsmd.getColumnName(i);strs[i - 1] = str;System.out.print(str + "/t");}System.out.println("/n------------------------------------------------------------------------------------------------------------------------");while (rs.next()) {for (int i = 1; i <= rsmd.getColumnCount(); i++) {System.out.print(rs.getString(i) + "/t");}System.out.println();}System.out.println("------------------------------------------------------------------------------------------------------------------------");}}
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