java - 如何在一条语句中将多行插入到 DB2 中？

Question

我正在使用 Java 和 jdbc 驱动程序建立与 DB2 数据库的连接。我正在尝试使用单个语句将多行插入表中。

下面是我的代码:

 public void createResources(List<Resources> addedResources)
        throws SQLException{

    Connection conn = null;
    PreparedStatement statement = null; 
     int i = 0; 

     String values = "INSERT INTO GROUPS (GROUP_NAME, ENTRY_NAME, 
ENTRY_TYPE, LAST_REQ, CREATE_BY, REQ_BY, LAST_CHANGED, LAST_REQ_TIME) VALUES 
 " +  System.getProperty("line.separator");

    while(i < addedResources.size()){

        Timestamp LAST_CHANGED = 
Timestamp.valueOf(addedResources.get(i).getLAST_CHANGED().trim());
        Timestamp LAST_REQ_TIME = 
Timestamp.valueOf(addedResources.get(i).getLAST_REQ_TIME().trim());

        values = values + "('" + 
addedResources.get(i).getGROUP_NAME().trim() + "', '" + 

addedResources.get(i).getENTRY_NAME().trim() + "', '" + 

addedResources.get(i).getENTRY_TYPE().trim() + "', '" +

addedResources.get(i).getLAST_REQ().trim() + "', '"   +

addedResources.get(i).getCREATE_BY().trim() + "', '"  +

addedResources.get(i).getREQ_BY().trim()   + "', '"   +
                                      LAST_CHANGED + "', '"   +
                                      LAST_REQ_TIME + "')," + 
System.getProperty("line.separator"); 


    i = i + 1;
    }   
    values = values.substring(0,values.trim().length()-1);
    Log(Integer.toString(values.length()));
    Log(values);

    try {

         // Get the DB connection
        conn = this.ds.getConnection();
        conn.setAutoCommit(false);

        // Prepare the statement and populate with data
        statement = conn.prepareStatement(values);



        // Perform the INSERT operation
        statement.executeUpdate();

        //Commit the changes 
        conn.commit();
        Log("Employee Successfully Added!");
    }
    finally{


        // Any exceptions will be propagated

        // Close database objects, regardless of what happened
        if ( statement != null ) {
            statement.close();
        }
        if ( conn != null ) {
            conn.close();
        }

    }



   }

总而言之，我有一个循环，它迭代列表中的对象并延长插入语句，直到它包含 ArrayList 中的所有行。然后，当循环完成时，我清理字符串的末尾，并尝试执行该语句。

以下是执行该方法时查询语句的示例:

INSERT INTO GROUPS (GROUP_NAME, ENTRY_NAME, ENTRY_TYPE, LAST_REQ, CREATE_BY, 
REQ_BY, LAST_CHANGED, LAST_REQ_TIME) VALUES 
('JOHN', 'TEST1', 'FILE', 'N/A', 'SSDP071', 'N/A', '2018-09-17 
19:36:34.004', '2018-09-17 19:36:34.004'),
('JOHN', 'TEST2', 'FILE', 'N/A', 'SSDP071', 'N/A', '2018-09-17 
19:36:37.771', '2018-09-17 19:36:37.771'),
('JOHN', 'TEST3', 'FILE', 'N/A', 'SSDP071', 'N/A', '2018-09-17 
19:36:42.021', '2018-09-17 19:36:42.021')

我的代码尝试执行并抛出以下错误:

[9/17/18 19:36:42:834 GMT] 00000557 SystemOut O com.ibm.db2.jcc.am.SqlSyntaxErrorException:[jcc][50053][12311][4.22.37] T2zOS 异常:[jcc][T2zos]T2zosPreparedStatement.readPrepareDescribeOut put_:nativePrepareInto:1583:DB2 引擎 SQL 错误，SQLCODE = -104，SQLSTATE = 42601，错误标记 = ,;FOR NOT ATOMIC ERRORCODE=-104，SQLSTATE=42601

我的错误标记是一个逗号，我不确定它指的是哪个。有没有办法在 DB2 表中插入多行？帮助将不胜感激!

Answer 1

您可以使用批处理语句来代替:

String values = "INSERT INTO GROUPS " +
"(GROUP_NAME,ENTRY_NAME,ENTRY_TYPE,LAST_REQ,CREATE_BY,REQ_BY,LAST_CHANGED,LAST_REQ_TIME) " +
"VALUES (?,?,?,?,?,?,?,?)";

// ... 

statement = conn.prepareStatement(values);

// ... 

while(i < addedResources.size()){
   statement.setString(addedResources.get(i)).getGROUP_NAME().trim());
   statement.setString(addedResources.get(i)).getENTRY_NAME().trim());

   // ...  

   statement.addBatch();
}
statement.executeBatch();