我們將在這里看到如何使用 Java 顯示 MySQL 數據庫中的所有表。您可以使用 MySQL 中的 show 命令來獲取 MySQL 數據庫中的所有表。
假設我們的數據庫是“test”。 Java代碼如下，顯示數據庫“test”內的所有表名。
Java代碼如下。這里，MySQL 和 Java 之間建立了連接 –
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("Connection is created succcessfully:");
} 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("All table names are in test database:");
while (rs.next()) {
String tblName = rs.getString("TABLE_NAME");
System.out.println(tblName);
count++;
}
System.out.println(count + " Rows in set ");
}
}
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以下是顯示數據庫測試中所有表的輸出 –
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. Connection is created succcessfully: All table names are in test database: 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
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要進行交叉檢查，請使用 MySQL show 命令顯示數據庫“test”內的所有表。查詢如下 –
mysql> use test; Database changed mysql> show tables;
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以下是輸出 –
+------------------------------+ | 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)
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正如您在上面看到的，它們都給出了相同的結果。
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