talend open studio toracleoutput控件不能在两个库之间导blob

最新推荐文章于 2019-09-21 23:22:44 发布

linqingtao

最新推荐文章于 2019-09-21 23:22:44 发布

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分类专栏：工作文章标签： SQL Java JDBC

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解决Talend Open Studio在跨数据库环境下Blob数据交换问题，通过修改源代码支持正确导入导出。

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tos版本4.0.2

最近同事在弄数据交换，用的是talend open studio（tos），在一个数据库的情况下，使用toracleoutput控件可以实现blob的导入导出。但是在两个数据库的情况下执行涉及好的过程就报错了，报没有表或者视图。很怪异的报错。

我经过查看数据交换工具生成的运行期代码，发现，blob的处理方式是用jdbc 的setObject（blob）方法

原代码如下

pstmt_tOracleOutput_3.setObject(6, rs.getObject(6));

这个方法在两个库之间是不行的。

改用如下代码，可以通过

java.sql.Blob oblob = (java.sql.Blob) (rs.getObject(6));
pstmt_tOracleOutput_3.setObject(6, oblob.getBytes(1, (int) oblob.length()));

通过修改tos下面

TOS-Win32-r43696-V4.0.2\plugins\org.talend.designer.components.localprovider_4.0.2.r43696\components\templates下的db_output_bulk.skeleton文件

generateSetStmt方法，添加else分支

public String generateSetStmt(String typeToGenerate, String dbType, Column column, int index, String incomingConnName, String cid, int actionType) {
            boolean isObject = false;
            String prefix = null;
            if(actionType == NORMAL_TYPE) {
                prefix = "pstmt_";
            } else if(actionType == INSERT_TYPE) {
                prefix = "pstmtInsert_";
            } else if(actionType == UPDATE_TYPE) {
                prefix = "pstmtUpdate_";
            }
            StringBuilder setStmt = new StringBuilder();
            if(typeToGenerate.equals("Character")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.CHAR);\r\n");                
            } else if(typeToGenerate.equals("Date")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.DATE);\r\n");                
            } else if(typeToGenerate.equals("byte[]")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                if(dbType != null && (dbType.equals("LONG RAW") || dbType.equals("RAW"))) {
                    setStmt.append(prefix + cid + ".setBytes(" + index + ", null);\r\n");
                } else {
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.ARRAY);\r\n");                    
                }                
            } else if(typeToGenerate.equals("Long") || typeToGenerate.equals("Byte") || typeToGenerate.equals("Integer") || typeToGenerate.equals("Short")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.INTEGER);\r\n");                
            } else if(typeToGenerate.equals("String")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                if(dbType != null && dbType.equals("CLOB")) {
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.CLOB);\r\n");                    
                } else {
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.VARCHAR);\r\n");                    
                }                
            } else if(typeToGenerate.equals("Object")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                if(dbType != null && dbType.equals("BLOB")) {
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.BLOB);\r\n");
        		} else if("CLOB".equals(dbType)){
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.CLOB);\r\n");
                } else {
                    setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.OTHER);\r\n");                    
                }               
            } else if(typeToGenerate.equals("Boolean")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.BOOLEAN);\r\n");                
            } else if(typeToGenerate.equals("Double")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.DOUBLE);\r\n");                
            } else if(typeToGenerate.equals("Float")) {
                isObject = true;
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.FLOAT);\r\n");                
            }
            if(isObject) {
                setStmt.append("} else {");
            }
            typeToGenerate = getGenerateType(typeToGenerate);
            if(typeToGenerate.equals("Char") || typeToGenerate.equals("Character")) {
                if(isObject) {
                    setStmt.append("if(" + incomingConnName + "." + column.getName() + " == null) {\r\n"); 
                } else {
                    setStmt.append("if(String.valueOf(" + incomingConnName + "." + column.getName() + ").toLowerCase().equals(\"null\")) {\r\n");
                }
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.CHAR);\r\n");
                setStmt.append("} else if(" + incomingConnName + "." + column.getName() + " == '\0'){\r\n");
                setStmt.append(prefix + cid + ".setString(" + index + ", \"\");\r\n");
                setStmt.append("} else {\r\n");
                setStmt.append(prefix + cid + ".setString(" + index + ", String.valueOf(" + incomingConnName + "." + column.getName() + "));\r\n");
                setStmt.append("}");
            } else if(typeToGenerate.equals("Date")) {
                setStmt.append("if(" + incomingConnName + "." + column.getName() + " != null) {\r\n");
                setStmt.append(prefix + cid + ".setTimestamp(" + index + ", new java.sql.Timestamp(" + incomingConnName + "." + column.getName() + ".getTime()));\r\n");
                setStmt.append("} else {\r\n");
                setStmt.append(prefix + cid + ".setNull(" + index + ", java.sql.Types.DATE);\r\n");
                setStmt.append("}\r\n");
            } else if(typeToGenerate.equals("Bytes") && (dbType != null && (dbType.equals("LONG RAW") || dbType.equals("RAW")))) {
                setStmt.append(prefix + cid + ".setBytes(" + index + ", " + incomingConnName + "." + column.getName() + ");\r\n");
            } else if(typeToGenerate.equals("String") && (dbType != null && dbType.equals("CLOB"))) {
                setStmt.append(prefix + cid + ".setCharacterStream(" + index + ", new java.io.StringReader(" + incomingConnName + "." + column.getName() + "), " + incomingConnName + "." + column.getName() + ".length());\r\n");                
            } else if (typeToGenerate.equals("Bytes") && (dbType != null && dbType.equals("BLOB"))) {
                setStmt.append(prefix + cid + ".setBinaryStream(" + index + ", new java.io.ByteArrayInputStream((byte[])" + incomingConnName + "." + column.getName() + "), ((byte[])" + incomingConnName + "." + column.getName() + ").length);\r\n");
            } else if (typeToGenerate.equals("Object") && (dbType != null && dbType.equals("BLOB"))) {//添加的else代码
				setStmt.append("java.sql.Blob oblob = (java.sql.Blob)(" + incomingConnName + "." + column.getName()+");\r\n");
                setStmt.append(prefix + cid + ".set" + typeToGenerate + "(" + index + ", oblob.getBytes(1, (int)oblob.length()));\r\n");
            }
            else {
                setStmt.append(prefix + cid + ".set" + typeToGenerate + "(" + index + ", " + incomingConnName + "." + column.getName() + ");\r\n");
            }
            if(isObject) {
                setStmt.append("}\r\n");
            }
            return setStmt.toString();            
        }