获取mysql可行方法_Mysql学习Java实现获得MySQL数据库中所有表的记录总数可行方法...

《Mysql学习Java实现获得MySQL数据库中所有表的记录总数可行方法》要点：

本文介绍了Mysql学习Java实现获得MySQL数据库中所有表的记录总数可行方法，希望对您有用。如果有疑问，可以联系我们。在MySQL中,可以通过SELECT COUNT(*) FROM table_name查询某个表中有多少条记录.如果想知道某个数据库中所有别的记录总数应该怎么做呢?本文给出两种可行的Java程序,解决该问题.

1. 首先确定数据库中有多少个表,然后对每个表执行SELECT COUNT(*) FROM table_name

代码如下:

import java.sql.Connection;

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.ArrayList;

import java.util.List;

public class Test {

private static String driver = "com.mysql.jdbc.Driver";

private static String url = "jdbc:mysql://127.0.0.1/";

private static String db = "test";

private static String user = "root";

private static String pass = "test";

static Connection conn = null;

static Statement statement = null;

static PreparedStatement ps = null;

static ResultSet rs = null;

static List tables = new ArrayList();

public static void startMySQLConn() {

try {

Class.forName(driver).newInstance();

conn = DriverManager.getConnection(url+db, user, pass);

if (!conn.isClosed()) {

System.out.println("Succeeded connecting to MySQL!");

}

statement = conn.createStatement();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void closeMySQLConn() {

if(conn != null){

try {

conn.close();

System.out.println("Database connection terminated!");

} catch (SQLException e) {

e.printStackTrace();

}

}

}

public static void getTables() {

String sql = "show tables;";

try {

ps = conn.prepareStatement(sql);

rs = ps.executeQuery();

while (rs.next()) {

tables.add(rs.getString(1));

}

} catch (Exception e) {

e.printStackTrace();

}

}

public static long getDbSum() {

long sum = 0;

String sql = "select count(*) from ";

try {

for(String tblName: tables) {

ps = conn.prepareStatement(sql + tblName + ";");

rs = ps.executeQuery();

while (rs.next()) {

sum += rs.getInt(1);

}

}

} catch (Exception e) {

e.printStackTrace();

}

return sum;

}

public static void main(String[] args) {

startMySQLConn();

getTables();

System.out.println(getDbSum());

closeMySQLConn();

}

}

2. 借助information_schema库的tables表

代码如下:

import java.sql.Connection;

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.ArrayList;

import java.util.List;

public class Test {

private static String driver = "com.mysql.jdbc.Driver";

private static String url = "jdbc:mysql://127.0.0.1/";

private static String db = "test";

private static String user = "root";

private static String pass = "test";

static Connection conn = null;

static Statement statement = null;

static PreparedStatement ps = null;

static ResultSet rs = null;

public static void startMySQLConn() {

try {

Class.forName(driver).newInstance();

conn = DriverManager.getConnection(url+db, user, pass);

if (!conn.isClosed()) {

System.out.println("Succeeded connecting to MySQL!");

}

statement = conn.createStatement();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void closeMySQLConn() {

if(conn != null){

try {

conn.close();

System.out.println("Database connection terminated!");

} catch (SQLException e) {

e.printStackTrace();

}

}

}

public static void useDB() {

String sql = "use information_schema;";

try {

ps = conn.prepareStatement(sql);

rs = ps.executeQuery();

} catch (Exception e) {

e.printStackTrace();

}

}

public static long getDbSum() {

long sum = 0;

String sql = "select table_name,table_rows from tables where TABLE_SCHEMA = '" +

db + "' order by table_rows desc;";

//System.out.println(sql);

try {

ps = conn.prepareStatement(sql);

rs = ps.executeQuery();

while (rs.next()) {

sum += rs.getInt(2);

}

} catch (Exception e) {

e.printStackTrace();

}

return sum;

}

public static void main(String[] args) {

startMySQLConn();

useDB();

System.out.println(getDbSum());

closeMySQLConn();

}

}

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