添加OpenCv

DataCenter/MySQL.cpp

@@ -0,0 +1,218 @@
+#include "MySQL.h"
+#include <QSqlQuery>
+#include <QSqlError>
+#include <QDateTime>
+#include <QLoggingCategory>
+#include <QSqlRecord>
+#include <GlobalDefinitions/Variable.h>
+/* 方便统一加时间前缀 */
+static QString timeStamp()
+{
+    return QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");
+}
+
+MySQL::MySQL(QObject *parent) : QObject(parent) {}
+
+bool MySQL::open(const QString &host,
+                 int            port,
+                 const QString &user,
+                 const QString &pwd,
+                 const QString &dbName)
+{
+    if (QSqlDatabase::contains("qt_mysql_conn"))
+        db_ = QSqlDatabase::database("qt_mysql_conn");
+    else
+        db_ = QSqlDatabase::addDatabase("QMYSQL", "qt_mysql_conn");
+
+    db_.setHostName(host);
+    db_.setPort(port);
+    db_.setDatabaseName(dbName);
+    db_.setUserName(user);
+    db_.setPassword(pwd);
+
+    if (!db_.open()) {
+        qWarning() << timeStamp() << "【错误】连接失败：" << db_.lastError().text();
+        return false;
+    }
+    qInfo() << timeStamp() << "【信息】数据库连接成功";
+    return true;
+}
+
+void MySQL::close()
+{
+    db_.close();
+    qInfo() << timeStamp() << "【信息】数据库已关闭";
+}
+
+bool MySQL::createTable(const QString &tableName,
+                        const QMap<QString, QString> &otherFields)
+{
+    if (otherFields.isEmpty()) {
+        qWarning() << timeStamp() << "【错误】字段信息为空，无法建表";
+        return false;
+    }
+
+    QStringList fields;
+    fields << "`00_记录时间` DATETIME DEFAULT CURRENT_TIMESTAMP";
+    for (auto it = otherFields.begin(); it != otherFields.end(); ++it)
+        fields << QString("`%1` %2").arg(it.key(), it.value());
+
+    QString sql = QString("CREATE TABLE IF NOT EXISTS `%1` (%2) "
+                          "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4")
+                      .arg(tableName, fields.join(", "));
+
+    QSqlQuery q(db_);
+    if (!q.exec(sql)) {
+        qWarning() << timeStamp() << "【错误】建表失败：" << q.lastError().text();
+        return false;
+    }
+    //qInfo() << timeStamp() << "【信息】表" << tableName << "创建/确认成功";
+    return true;
+}
+
+bool MySQL::insertPartialV(const QString &tableName,
+                          const QStringList &fieldNames,
+                          const QVariantList &values)
+{
+    if (fieldNames.size() != values.size()) {
+        qWarning() << timeStamp() << "【错误】字段名与值数量不一致";
+        return false;
+    }
+
+    QStringList ph;
+    for (int i = 0; i < values.size(); ++i) ph << "?";
+    QString placeHolders = ph.join(",");
+
+    QStringList cols;
+    for (const QString &f : fieldNames)
+        cols << QString("`%1`").arg(f);
+    QString colStr = cols.join(",");
+
+    QString sql = QString("INSERT INTO `%1` (%2) VALUES (%3)")
+                      .arg(tableName, colStr, placeHolders);
+
+    QSqlQuery q(db_);
+    q.prepare(sql);
+    for (const QVariant &v : values) q.addBindValue(v);
+
+    if (!q.exec()) {
+        qWarning() << timeStamp() << "【错误】插入指定字段失败：" << q.lastError().text();
+        return false;
+    }
+    return true;
+}
+bool MySQL::insertPartial(const QString &tableName,
+                          const QStringList &fieldNames,
+                          const QStringList &values)
+{
+    if (fieldNames.size() != values.size()) {
+        qWarning() << timeStamp() << "字段与值数量不一致";
+        return false;
+    }
+
+    QStringList cols;
+    for (const QString &f : fieldNames)
+        cols << QString("`%1`").arg(f);
+    QString colStr = cols.join(",");
+
+    QStringList ph;
+    for (int i = 0; i < values.size(); ++i)
+        ph << "?";                     // 一个字段对应一个 ?
+    QString placeholders = ph.join(",");
+
+    QString sql = QString("INSERT INTO `%1` (%2) VALUES (%3)")
+                      .arg(tableName, colStr, placeholders);
+
+    QSqlQuery q(db_);
+    q.prepare(sql);
+    for (const QString &v : values) q.addBindValue(v); // 保证传字符串
+
+    if (!q.exec()) {
+        qWarning() << timeStamp() << "插入失败：" << q.lastError().text();
+        return false;
+    }
+    return true;
+}
+bool MySQL::insertFull(const QString &tableName,
+                       const QVariantList &values)
+{
+    if (values.isEmpty()) {
+        qWarning() << timeStamp() << "【错误】插入值列表为空";
+        return false;
+    }
+
+    /* 1. 在最前面补当前时间 */
+    QVariantList realValues;
+    realValues << QDateTime::currentDateTime();
+    realValues.append(values);
+
+    /* 2. 生成对应占位符 */
+    QStringList ph;
+    for (int i = 0; i < realValues.size(); ++i) ph << "?";
+    QString placeHolders = ph.join(",");
+
+    QString sql = QString("INSERT INTO `%1` VALUES (%2)")
+                      .arg(tableName, placeHolders);
+
+    QSqlQuery q(db_);
+    q.prepare(sql);
+    for (const QVariant &v : realValues) q.addBindValue(v);
+
+    if (!q.exec()) {
+        qWarning() << timeStamp() << "【错误】插入全部字段失败：" << q.lastError().text();
+        return false;
+    }
+    qInfo() << timeStamp() << "【信息】插入全部字段成功";
+    return true;
+}
+/* 读取最新 maxRows 条完整记录（不足时有多少给多少） */
+QList<QVariantList> MySQL::selectLatest(const QString &tableName,
+                                        int maxRows)
+{
+    QList<QVariantList> rows;
+
+    QString sql = QString(
+        "SELECT * FROM `%1` ORDER BY `00_记录时间` DESC LIMIT %2")
+        .arg(tableName).arg(maxRows);
+
+    QSqlQuery q(db_);
+    if (!q.exec(sql)) {
+        qWarning() << timeStamp() << "【错误】读取最新记录失败：" << q.lastError().text();
+        return rows;
+    }
+
+    while (q.next()) {
+        QVariantList cols;
+        for (int i = 0; i < q.record().count(); ++i)
+            cols << q.value(i);
+        rows << cols;
+    }
+    return rows;
+}
+
+/* 读取最新 maxRows 条，只拿指定字段 */
+QList<QVariantList> MySQL::selectLatest(const QString &tableName,
+                                        const QStringList &fieldNames,
+                                        int maxRows)
+{
+    QList<QVariantList> rows;
+
+    QString colStr = fieldNames.join("`,`").prepend("`").append("`");
+    QString sql = QString(
+        "SELECT %1 FROM `%2` ORDER BY `00_记录时间` DESC LIMIT %3")
+        .arg(colStr, tableName).arg(maxRows);
+
+    QSqlQuery q(db_);
+    if (!q.exec(sql)) {
+        qWarning() << timeStamp() << "【错误】读取最新记录(指定字段)失败：" << q.lastError().text();
+        return rows;
+    }
+
+    while (q.next()) {
+        QVariantList cols;
+        for (const QString &f : fieldNames)
+            cols << q.value(f);
+        rows << cols;
+    }
+    return rows;
+}