IDEA 链接Mysql数据库并执行查询操作的完整代码
编程学习 2021-07-05 14:37www.dzhlxh.cn编程入门
这篇文章主要介绍了IDEA 链接Mysql数据库并执行查询操作的完整代码,代码不难，详细大家看完本文肯定有意向不到的收获，感兴趣的朋友跟随长沙网络推广一起看看吧
1、先写个 Mysql 的链接设置页面
package com.wretchant.fredis.menu.mysql;
import com.intellij.notification.NotificationType;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.wretchant.fredis.gui.dialog.TableDialog;
import com.wretchant.fredis.util.NotifyUtils;
import com.wretchant.fredis.util.PropertiesUtils;
import org.jetbrains.annotations.NotNull;
import javax.swing.*;
import java.util.Map;
import java.util.Properties;
/**
* @author Created by 谭健 on 2020/8/26. 星期三. 15:24.
* © All Rights Reserved.
*/
public class MysqlConfig extends AnAction {
@Override
public void actionPerformed(@NotNull AnActionEvent event) {
Properties properties = PropertiesUtils.readFromSystem();
if (properties != null) {
TableDialog.TableField build = TableDialog.TableField.build(properties.stringPropertyNames());
TableDialog dialog = new TableDialog("Mysql 连接配置", build);
for (int i = 0; i < dialog.getLabels().size(); i++) {
JLabel label = dialog.getLabels().get(i);
JTextField textField = dialog.getInputs().get(i);
String property = properties.getProperty(label.getText());
textField.setText(property);
}
dialog.show();
if (dialog.isOK()) {
Map<String, String> valueMap = dialog.getValueMap();
valueMap.forEach(properties::setProperty);
PropertiesUtils.write2System(properties);
}
} else {
NotifyUtils.notifyUser(event.getProject(), "读取配置文件失败，配置文件不存在", NotificationType.ERROR);
}
}
}
2、然后简单的写个 JDBC 操作数据库的支持类
package com.wretchant.fredis.support;
import cn.hutool.core.util.StrUtil;
import com.intellij.notification.NotificationType;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.editor.SelectionModel;
import com.wretchant.fredis.util.ClipboardUtils;
import com.wretchant.fredis.util.NotifyUtils;
import com.wretchant.fredis.util.PropertiesUtils;
import com.wretchant.fredis.value.StringValue;
import org.apache.commons.lang.StringUtils;
import org.jetbrains.annotations.NotNull;
import java.sql.*;
import java.util.*;
/**
* @author Created by 谭健 on 2020/8/12. 星期三. 17:42.
* © All Rights Reserved.
*/
public class Mysql {
/**
* 执行查询语句的返回结果
*/
public static class Rs {
public Rs(List<Map<String, Object>> r) {
this.r = r;
this.count = r.size();
}
private List<Map<String, Object>> r = new ArrayList<>();
private int count;
public List<Map<String, Object>> getR() {
return r;
}
public void setR(List<Map<String, Object>> r) {
this.r = r;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public Map<String, Object> one() {
if (Objects.isNull(r) || r.isEmpty()) {
return null;
}
return r.get(0);
}
public Object oneGet(String key) {
return one().get(key);
}
}
// 参考： https://www.cnblogs.com/jyroy/p/9637149.html
public static class JDBCUtil {
/**
* 执行sql 并返回 map 数据
*
* @param sql
* @return
*/
public static Rs rs(String sql) {
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
List<Map<String, Object>> r = new ArrayList<>();
try {
connection = Mysql.DatabaseUtils.getConnection();
statement = connection.createStatement();
resultSet = statement.executeQuery(sql);
// 基础信息
ResultSetMetaData metaData = resultSet.getMetaData();
// 返回了多少个字段
int columnCount = metaData.getColumnCount();
while (resultSet.next()) {
Map<String, Object> valueMap = new LinkedHashMap<>();
for (int i = 0; i < columnCount; i++) {
// 这个字段是什么数据类型
String columnClassName = metaData.getColumnClassName(i);
// 字段名称
String columnName = metaData.getColumnName(i);
Object value = resultSet.getObject(columnName);
valueMap.put(columnName, value);
}
r.add(valueMap);
}
} catch (Exception e1) {
NotifyUtils.notifyUser(null, "error", NotificationType.ERROR);
e1.printStackTrace();
} finally {
release(connection, statement, resultSet);
}
return new Rs(r);
}
public static ResultSet es(String sql) {
Connection connection;
Statement statement;
ResultSet resultSet = null;
try {
connection = Mysql.DatabaseUtils.getConnection();
statement = connection.createStatement();
resultSet = statement.executeQuery(sql);
} catch (Exception e1) {
NotifyUtils.notifyUser(null, "error", NotificationType.ERROR);
e1.printStackTrace();
}
return resultSet;
}
public static void release(Connection connection, Statement st, ResultSet rs) {
closeConn(connection);
closeRs(rs);
closeSt(st);
}
public static void closeRs(ResultSet rs) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
rs = null;
}
}
private static void closeSt(Statement st) {
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
st = null;
}
}
private static void closeConn(Connection connection) {
try {
if (connection != null) {
connection.close();
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
connection = null;
}
}
}
public static class DatabaseUtils {
private static Connection connection = null;
static {
Properties properties = PropertiesUtils.readFromSystem();
try {
if (properties != null) {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(
properties.getProperty("mysql.url"),
properties.getProperty("mysql.username"),
properties.getProperty("mysql.password")
);
NotifyUtils.notifyUser(null, "数据库连接成功", NotificationType.INFORMATION);
}
} catch (Exception e) {
NotifyUtils.notifyUser(null, "数据库连接失败", NotificationType.ERROR);
e.printStackTrace();
}
}
public static Connection getConnection() {
return connection;
}
}
public static void exec(@NotNull AnActionEvent event, Template template) {
StringValue stringValue = new StringValue(template.getDefaultValue());
Optional.ofNullable(event.getData(PlatformDataKeys.EDITOR)).
ifPresent(editor -> {
SelectionModel selectionModel = editor.getSelectionModel();
String selectedText = selectionModel.getSelectedText();
if (StringUtils.isNotBlank(selectedText)) {
stringValue.setValue(StrUtil.format(template.getDynamicValue(), selectedText));
}
});
ClipboardUtils.clipboard(stringValue.getValue());
NotifyUtils.notifyUser(event.getProject(), stringValue.getValue(), NotificationType.INFORMATION);
}
/**
* sql 语句模版
*/
public enum Template {
SELECT("SELECT * FROM x WHERE 1 = 1 AND ", "SELECT * FROM {} WHERE 1 = 1 AND ", "查询语句"),
UPDATE("UPDATE x SET x = x WHERE 1 = 1 AND ", "UPDATE {} SET x = x WHERE 1 = 1 AND ", "更新语句"),
DELETE("DELETE FROM x WHERE 1 = 1 ", "DELETE FROM {} WHERE 1 = 1 ", "删除语句"),
INSERT("INSERT INTO * (x) VALUES (x) ", "INSERT INTO {} (x) VALUES (x) ", "新增语句"),
;
Template(String defaultValue, String dynamicValue, String describe) {
this.defaultValue = defaultValue;
this.dynamicValue = dynamicValue;
this.describe = describe;
}
public String getDynamicValue() {
return dynamicValue;
}
public String getDefaultValue() {
return defaultValue;
}
public String getDescribe() {
return describe;
}
/**
* 模版内容:默认值
*/
private final String defaultValue;
/**
* 动态内容
*/
private final String dynamicValue;
/**
* 内容描述
*/
private final String describe;
}
}
3、写个测试连接的类，测试一下 mysql 是否可以正常链接
package com.wretchant.fredis.menu.mysql;
import com.intellij.notification.NotificationType;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.wretchant.fredis.support.Mysql;
import com.wretchant.fredis.util.NotifyUtils;
import org.jetbrains.annotations.NotNull;
import java.sql.ResultSet;
/**
* @author Created by 谭健 on 2020/9/15. 星期二. 10:17.
* © All Rights Reserved.
*/
public class MysqlConn extends AnAction {
@Override
public void actionPerformed(@NotNull AnActionEvent event) {
try {
ResultSet es = Mysql.JDBCUtil.es("select 1 as ct");
es.next();
int ct = es.getInt("ct");
if (ct == 1) {
NotifyUtils.notifyUser(null, "连接是正常的", NotificationType.INFORMATION);
} else {
NotifyUtils.notifyUser(null, "连接不正常", NotificationType.ERROR);
}
Mysql.JDBCUtil.closeRs(es);
} catch (Exception e1) {
e1.printStackTrace();
NotifyUtils.notifyUser(null, "连接不正常", NotificationType.ERROR);
}
}
}
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