介绍
h2-database java版本的数据库
1 | <dependency> |
help说明
1 | [lixl@localhost h2db]$ java -cp h2*.jar org.h2.tools.Server -? |
1 | [lixl@localhost h2db]$ java -cp h2*.jar org.h2.tools.Shell -? |
database_url
tcp
java -cp h2-1.4.197.jar org.h2.tools.Server -tcpAllowOthers -webAllowOthersjdbc-url-tcp
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4driverClassName = org.h2.Driver
url= jdbc:h2:tcp://localhost:9092/~/test
username = test
password = testjdbc-url-local
jdbc:h2:~/dbtest;MODE=Oracle;AUTO_SERVER=TRUE
兼容性jdbc-url-mem
jdbc:h2:mem:testconsole
java -cp h2-1.4.197.jar org.h2.tools.Shell -url "jdbc:h2:tcp://192.168.18.147:9092/~/test" -user test -password testjava -cp h2-1.4.197.jar org.h2.tools.Shell -url "jdbc:h2:/data/h2database/test" -user test -password testmaven exec-maven-plugin启动
pom.xml1
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<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>h2-server</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.199</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.h2.tools.Server</mainClass>
<arguments>
<argument>-tcpAllowOthers</argument>
<argument>-webAllowOthers</argument>
<!-- db文件不存在时，可以直接创建一个新的，而不是报错 -->
<argument>-ifNotExists</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</build>
</project>
mvn ecec:java 等同于 java -cp h2-1.4.197.jar org.h2.tools.Server -tcpAllowOthers -webAllowOthers -ifNotExists
CSV操作
通过数据库读取 CSV 文件
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SELECT * FROM CSVREAD('test.csv');
通过 CSV 文件导入数据
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3CREATE TABLE TEST AS SELECT * FROM CSVREAD('test.csv');
CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255))
AS SELECT * FROM CSVREAD('test.csv');通过数据库写入CSV 文件
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3CREATE TABLE TEST(ID INT, NAME VARCHAR);
INSERT INTO TEST VALUES(1, 'Hello'), (2, 'World');
CALL CSVWRITE('test.csv', 'SELECT * FROM TEST');java-Csv工具读写CSV文件
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45package com.sysware.p2m;
import org.h2.tools.Csv;
import org.h2.tools.SimpleResultSet;
import org.junit.Test;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;
public class H2CSVTest {
String csv_file = "d://test2.csv";
/**
* 读写本地csv文件
* @throws SQLException
*/
public void write() throws SQLException {
SimpleResultSet rs = new SimpleResultSet();
rs.addColumn("NAME", Types.VARCHAR, 255, 0);
rs.addColumn("EMAIL", Types.VARCHAR, 255, 0);
rs.addRow("Bob Meier", "bob.meier@abcde.abc");
rs.addRow("John Jones", "john.jones@abcde.abc");
new Csv().write(csv_file, rs, "UTF-8");
}
public void read() throws SQLException {
ResultSet rs = new Csv().read(csv_file, null, null);
ResultSetMetaData meta = rs.getMetaData();
while (rs.next()) {
for (int i = 0; i < meta.getColumnCount(); i++) {
System.out.println(
meta.getColumnLabel(i + 1) + ": " +
rs.getString(i + 1));
}
System.out.println();
}
rs.close();
}
}
连接池
1 | org.h2.jdbcx.JdbcConnectionPool.create |