loadrunner12：常用函数汇总说明之Database Functions参数函数，操作mysql数据库

环境准备：

1、准备好测试用的Mysql数据库。

2、下载并安装mysql odbc x32：https://dev.mysql.com/downloads/connector/odbc/

3、配置数据源（应该配置32位数据源）

 

 

 

遇到的问题：

1、“DB Connection failed {"ERROR [IM002] [Microsoft] [ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序”，主要原因时LR12为32位的，无法读取64位的数据源，将64位数据源改为32位即可。

解决办法：参考https://jingyan.baidu.com/article/6d704a13407c4128db51ca2d.html

安装32位的mysql-connector-odbc-8.0.25-win32，并重启电脑，查看之前配置的数据源显示支持了32位的。

根据使用手册内容可见，LR支持的关于Database Functions包括：

lr_db_connect	Connects to a database.
lr_db_dataset_action	Performs an action on a dataset.
lr_db_disconnect	Disconnects from a database.
lr_db_executeSQLStatement	Submits an SQL statement to a database.
lr_db_getValue	Retrieves a value from a dataset.

以下举例使用的数据为本地MySql数据库testdb中的student表：

脚本展示：

1、查询student表中数据

ConnMysql()
{
	//定义两个变量
    int i=1,NumRows;
	
	//创建数据库连接
	lr_db_connect("StepName=conMySql", 
	              "ConnectionString=Driver={MySQL ODBC 8.0 Unicode Driver};Server=localhost;Database=testdb;Trusted_Connection=False;User=root;Password=mysql", 
	              "ConnectionName=mysqlData", 
	              "ConnectionType=ODBC", 
	              LAST );
	
	//查询结果保存在Students数据集中，并返回查询记录数据总条数，存入NumRows中
	NumRows=lr_db_executeSQLStatement("StepName=findStudent", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=select * from student;", 
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	
	lr_output_message("The query returned %d rows.", NumRows);
	
	//循环打印所有记录的id、name、birthday,score。
	while(i<NumRows){
	    lr_db_getvalue("StepName=showStudentID", 
	        "DatasetName=StudentsSet", 
	        "Column=id", 
	        "Row=next", 
	        "OutParam=studentId", 
	        LAST);
	    lr_db_getvalue("StepName=showStudentName", 
	        "DatasetName=StudentsSet", 
	        "Column=name", 
	        "Row=current", 
	        "OutParam=studentName", 
	        LAST);
	        
	    lr_db_getvalue("StepName=showStudentBirthday", 
	        "DatasetName=StudentsSet", 
	        "Column=birthday", 
	        "Row=current", 
	        "OutParam=studentBirthday", 
	        LAST);
	
	    lr_db_getvalue("StepName=showStudentScore", 
	        "DatasetName=StudentsSet", 
	        "Column=score", 
	        "Row=current", 
	        "OutParam=studentScore", 
	        LAST);		
    
        lr_output_message(lr_eval_string("{studentId}"));
        lr_output_message(lr_eval_string("{studentName}"));
        lr_output_message(lr_eval_string("{studentBirthday}"));
        lr_output_message(lr_eval_string("{studentScore}"));
        
    	i=i+1;

    }
	
	//关闭数据库的链接
    lr_db_disconnect("StepName=disconnectMysql", 
        "ConnectionName=mysqlData", 
        LAST);
	
	
	return 0;
}

　　

2、更新student表中的数据

UpdateMysql()
{
	int NumRows=0;
	
	//创建数据库连接
	lr_db_connect("StepName=conMySql", 
	              "ConnectionString=Driver={MySQL ODBC 8.0 Unicode Driver};Server=localhost;Database=testdb;Trusted_Connection=False;User=root;Password=mysql", 
	              "ConnectionName=mysqlData", 
	              "ConnectionType=ODBC", 
	              LAST );
	
	//更新student表中学生“张三”的分数
	lr_db_executeSQLStatement("StepName=updateScore", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=UPDATE student SET score=33 WHERE NAME="张三";", 
									  "DatasetName=StudentsSet",	                                  
	                                  LAST );
	
	
	//查询结果保存在Students数据集中，并返回查询记录数据总条数，存入NumRows中
	NumRows=lr_db_executeSQLStatement("StepName=findStudent", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=select * from student where NAME="张三";", 
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	
	lr_output_message("The query returned %d rows.", NumRows);
	
	//获取查询到的数据集StudentsSet中的分数
    lr_db_getvalue("StepName=showScore", 
    "DatasetName=StudentsSet", 
    "Column=score", 
    "Row=next", 
    "OutParam=studentScore", 
    LAST);
	
	lr_output_message("学生“张三”的分数为：%s", lr_eval_string("{studentScore}"));
	
	//关闭数据库的链接
    lr_db_disconnect("StepName=disconnectMysql", 
        "ConnectionName=mysqlData", 
        LAST);
	
	
	return 0;
}

3、删除一条学生记录

DeleteMysql()
{
	int NumRows=0;
	
	//创建数据库连接
	lr_db_connect("StepName=conMySql", 
	              "ConnectionString=Driver={MySQL ODBC 8.0 Unicode Driver};Server=localhost;Database=testdb;Trusted_Connection=False;User=root;Password=mysql", 
	              "ConnectionName=mysqlData", 
	              "ConnectionType=ODBC", 
	              LAST );
	
	//删除student表中学生“七七”的记录
	lr_db_executeSQLStatement("StepName=DeleteScore", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=DELETE FROM student WHERE NAME="七七";",
									  "DatasetName=StudentsSet",		                                  
	                                  LAST );
	
	
	//查询结果保存在Students数据集中，并返回查询记录数据总条数，存入NumRows中
	NumRows=lr_db_executeSQLStatement("StepName=findStudent", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=select * from student where NAME="七七";", 
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	
	lr_output_message("The query returned %d rows.", NumRows);
	
	if(NumRows==0){
		lr_output_message("删除成功！");
	}else{
		lr_error_message("删除失败");
	}
	
	
	//关闭数据库的链接
    lr_db_disconnect("StepName=disconnectMysql", 
        "ConnectionName=mysqlData", 
        LAST);

	
	return 0;
}

　

4、插入一条学生记录

InsertMysql()
{

	//创建数据库连接
	lr_db_connect("StepName=conMySql", 
	              "ConnectionString=Driver={MySQL ODBC 8.0 Unicode Driver};Server=localhost;Database=testdb;Trusted_Connection=False;User=root;Password=mysql", 
	              "ConnectionName=mysqlData", 
	              "ConnectionType=ODBC", 
	              LAST );
	
	//插入一条记录，并保存在Students数据集中
	lr_db_executeSQLStatement("StepName=updateScore", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=INSERT INTO student VALUES(9,"小酒",NOW(),99);",
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	
	//查询插入的记录，并保存在Students数据集中
	lr_db_executeSQLStatement("StepName=findStudent", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=select * from student where NAME="小酒";", 
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	

	
	lr_db_getvalue("StepName=showID", 
    "DatasetName=StudentsSet", 
    "Column=id", 
    "Row=next", 
    "OutParam=studentID", 
    LAST);
	
    lr_db_getvalue("StepName=showName", 
    "DatasetName=StudentsSet", 
    "Column=name", 
    "Row=current", 
    "OutParam=studentName", 
    LAST);
	
    lr_db_getvalue("StepName=showBirth", 
    "DatasetName=StudentsSet", 
    "Column=birthday", 
    "Row=current", 
    "OutParam=studentBirth", 
    LAST);
	
    lr_db_getvalue("StepName=showScore", 
    "DatasetName=StudentsSet", 
    "Column=score", 
    "Row=current", 
    "OutParam=studentScore", 
    LAST);
	
    lr_output_message(lr_eval_string("{studentId}"));
    lr_output_message(lr_eval_string("{studentName}"));
    lr_output_message(lr_eval_string("{studentBirth}"));
    lr_output_message(lr_eval_string("{studentScore}"));
	
	//关闭数据库的链接
    lr_db_disconnect("StepName=disconnectMysql", 
        "ConnectionName=mysqlData", 
        LAST);	
	
	
	return 0;
}

　　

5、查询所有记录、重置游标、释放数据集内存：（ lr_db_dataset_action()）

QueryDataSet()
{
	
	//创建数据库连接
	lr_db_connect("StepName=conMySql", 
	              "ConnectionString=Driver={MySQL ODBC 8.0 Unicode Driver};Server=localhost;Database=testdb;Trusted_Connection=False;User=root;Password=mysql", 
	              "ConnectionName=mysqlData", 
	              "ConnectionType=ODBC", 
	              LAST );
	
	//查询结果保存在Students数据集中，并返回查询记录数据总条数，存入NumRows中
	lr_db_executeSQLStatement("StepName=findStudent", 
	                                  "ConnectionName=mysqlData", 
	                                  "SQLStatement=select * from student;", 
	                                  "DatasetName=StudentsSet",
	                                  LAST );
	    /*
     RESET: Set the cursor to the first record of the dataset.
     REMOVE: Releases the memory allocated for the dataset.
     PRINT: Prints the contents of the entire dataset to the Replay Log and other test report summaries.
    */
	 lr_db_dataset_action("StepName=PrintDataset", 
                        "DatasetName=StudentsSet", 
                        "Action=PRINT", //RESET、REMOVE、PRINT
                        LAST );


	lr_db_getvalue("StepName=showName", 
					"DatasetName=StudentsSet", 
					"Column=name", 
					"Row=next", 
					"OutParam=studentName", 
					LAST);
	
	lr_output_message("第一条记录的学生名称为：%s",lr_eval_string("{studentName}"));
	
	lr_db_getvalue("StepName=showName", 
					"DatasetName=StudentsSet", 
					"Column=name", 
					"Row=next", 
					"OutParam=studentName", 
					LAST);
	
	lr_output_message("第二条记录的学生名称为：%s",lr_eval_string("{studentName}"));
	
	//将数据库游标重置到数据集的第一条记录
	lr_db_dataset_action("StepName=PrintDataset", 
				        "DatasetName=StudentsSet", 
				        "Action=RESET", //RESET、REMOVE、PRINT
				        LAST );

	
	lr_db_getvalue("StepName=showName", 
					"DatasetName=StudentsSet", 
					"Column=name", 
					"Row=next", //若无以上RESET操作，此时查出的记录应为第三条记录的学生名称
					"OutParam=studentName", 
					LAST);
	lr_output_message("游标重置后查询的记录为第一条记录的学生名称为：%s",lr_eval_string("{studentName}"));
	
   
	//释放分配给数据集的内存。再次查询数据集的数据是将会报错“数据集未定义”，即{"Undefined dataset [Dataset name=StudentsSet]"}
	lr_db_dataset_action("StepName=PrintDataset", 
	                "DatasetName=StudentsSet", 
	                "Action=REMOVE", //RESET、REMOVE、PRINT
	                LAST );   
   
   	lr_db_getvalue("StepName=showName", 
    "DatasetName=StudentsSet", 
    "Column=name", 
    "Row=next", 
    "OutParam=studentName", 
    LAST);
   
	
	//关闭数据库的链接
    lr_db_disconnect("StepName=disconnectMysql", 
        "ConnectionName=mysqlData", 
        LAST);	
	
	return 0;
}

　　

遗留问题：

lr_db_getvalue()读取单个学生的中文姓名时，打印出来中文名字只打印一半，中文被截断了，但是读取英文不存在该问题（如下图所示），目前尚未定位出原因及解决办法，欢迎评论去讨论~~~