使用Java显示MySQL数据库中的所有表？
我们将在这里看到如何使用Java显示MySQL数据库中的所有表。您可以从MySQL使用show命令来获取MySQL数据库中的所有表。
假设我们的数据库为“测试”。Java代码如下所示，以显示数据库“test”中的所有表名。
Java代码如下。在这里，MySQL和Java之间建立了连接-
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.DatabaseMetaData;
public class GetAllTables {
public static void main(String[] args) throws SQLException {
Connection conn = null;
try {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (Exception e) {
System.out.println(e);
}
conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/test", "Manish", "123456");
System.out.println("成功创建连接：");
} catch (Exception e) {
System.out.println(e);
}
ResultSet rs = null;
DatabaseMetaData meta = (DatabaseMetaData) conn.getMetaData();
rs = meta.getTables(null, null, null, new String[] {
"TABLE"
});
int count = 0;
System.out.println("所有表名都在测试数据库中：");
while (rs.next()) {
String tblName = rs.getString("TABLE_NAME");
System.out.println(tblName);
count++;
}
System.out.println(count + " Rows in set ");
}
}以下是显示数据库测试中所有表的输出-
Wed Dec 12 14:55:28 IST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL = false, or set useSSL = true and provide truststore for server certificate verification. 成功创建连接： 所有表名都在测试数据库中： add30minutesdemo addcolumn addoneday agecalculatesdemo aliasdemo allcharacterbeforespace allownulldemo appendingdatademo autoincrementdemo betweendatedemo bigintandintdemo bigintdemo bookdatedemo changecolumnpositiondemo changeenginetabledemo charsetdemo concatenatetwocolumnsdemo constraintdemo cumulativesumdemo currentdatetimedemo customers dateasstringdemo dateformatdemo dateinsertdemo datesofoneweek datetimedemo dayofweekdemo decimaltointdemo decrementdemo defaultdemo deleteallfromtable deletemanyrows destination differencetimestamp distinctdemo employee employeedesignation findlowercasevalue generatingnumbersdemo gmailsignin groupbytwofieldsdemo groupmonthandyeardemo highestidorderby highestnumberdemo ifnulldemo increasevarchardemo insert insertignoredemo insertwithmultipleandsigle int11demo intvsintanythingdemo lasttwocharacters likebinarydemo likedemo maxlengthfunctiondemo moviecollectiondemo myisamtoinnodbdemo newtableduplicate notequalsdemo nowandcurdatedemo nthrecorddemo nullandemptydemo orderbycharacterlength orderbynullfirstdemo orderindemo originaltable parsedatedemo passinganarraydemo persons prependstringoncolumnname pricedemo queryresultdemo replacedemo rowexistdemo rowpositiondemo rowwithsamevalue safedeletedemo searchtextdemo selectdataonyearandmonthdemo selectdistincttwocolumns selectdomainnameonly sha256demo skiplasttenrecords sortcolumnzeroatlastdemo storedproctable stringreplacedemo stringtodate student studentdemo studentmodifytabledemo studenttable subtract3hours temporarycolumnwithvaluedemo timetosecond timetoseconddemo toggledemo toogledemo truncatetabledemo updatealldemo updatevalueincrementally wheredemo wholewordmatchdemo zipcodepadwithzerodemo 103 Rows in set
要进行交叉检查，请使用MySQLshow命令显示数据库“test”中的所有表。查询如下-
mysql> use test; Database changed mysql> show tables;
以下是输出-
+------------------------------+ | Tables_in_test | +------------------------------+ | add30minutesdemo | | addcolumn | | addoneday | | agecalculatesdemo | | aliasdemo | | allcharacterbeforespace | | allownulldemo | | appendingdatademo | | autoincrementdemo | | betweendatedemo | | bigintandintdemo | | bigintdemo | | bookdatedemo | | changecolumnpositiondemo | | changeenginetabledemo | | charsetdemo | | concatenatetwocolumnsdemo | | constraintdemo | | cumulativesumdemo | | currentdatetimedemo | | customers | | dateasstringdemo | | dateformatdemo | | dateinsertdemo | | datesofoneweek | | datetimedemo | | dayofweekdemo | | decimaltointdemo | | decrementdemo | | defaultdemo | | deleteallfromtable | | deletemanyrows | | destination | | differencetimestamp | | distinctdemo | | employee | | employeedesignation | | findlowercasevalue | | generatingnumbersdemo | | gmailsignin | | groupbytwofieldsdemo | | groupmonthandyeardemo | | highestidorderby | | highestnumberdemo | | ifnulldemo | | increasevarchardemo | | insert | | insertignoredemo | | insertwithmultipleandsigle | | int11demo | | intvsintanythingdemo | | lasttwocharacters | | likebinarydemo | | likedemo | | maxlengthfunctiondemo | | moviecollectiondemo | | myisamtoinnodbdemo | | newtableduplicate | | notequalsdemo | | nowandcurdatedemo | | nthrecorddemo | | nullandemptydemo | | orderbycharacterlength | | orderbynullfirstdemo | | orderindemo | | originaltable | | parsedatedemo | | passinganarraydemo | | persons | | prependstringoncolumnname | | pricedemo | | queryresultdemo | | replacedemo | | rowexistdemo | | rowpositiondemo | | rowwithsamevalue | | safedeletedemo | | searchtextdemo | | selectdataonyearandmonthdemo | | selectdistincttwocolumns | | selectdomainnameonly | | sha256demo | | skiplasttenrecords | | sortcolumnzeroatlastdemo | | storedproctable | | stringreplacedemo | | stringtodate | | student | | studentdemo | | studentmodifytabledemo | | studenttable | | subtract3hours | | temporarycolumnwithvaluedemo | | timetosecond | | timetoseconddemo | | toggledemo | | toogledemo | | truncatetabledemo | | updatealldemo | | updatevalueincrementally | | wheredemo | | wholewordmatchdemo | | zipcodepadwithzerodemo | +------------------------------+ 103 rows in set (0.01 sec)
如您在上面所看到的，它们两者都给出相同的结果。