SQL查询在SQL Developer中工作,但在Java端不工作
我正试图解决这个问题,但没有成功。我试图查找特定表中包含值的每一行SQL查询在SQL Developer中工作,但在Java端不工作,java,sql,oracle,jdbc,oracle11g,Java,Sql,Oracle,Jdbc,Oracle11g,我正试图解决这个问题,但没有成功。我试图查找特定表中包含值的每一行 例如,让我们考虑一下这个雇员表: | Id | First_name | Last_name | Date_of_birth | Car_number | |------------------|------------|------------|---------------|------------| | 10001 | John | Washington |
例如,让我们考虑一下这个雇员表:
| Id | First_name | Last_name | Date_of_birth | Car_number |
|------------------|------------|------------|---------------|------------|
| 10001 | John | Washington | 28-Aug-43 | 5 |
| 10083 | Arvid | Sharma | 24-Nov-54 | null |
| 10034 | David | Johnson | 12-May-76 | |
我正在Java端构建此查询(这是我在日志中打印的内容):
然后我使用一个准备好的语句,这样,如果我搜索字符串“oh”,它就会变成:
Select * From Employee WHERE Id LIKE '%oh%' OR First_name LIKE '%oh%' OR Last_name LIKE '%oh%' OR Date_of_birth LIKE '%oh%' OR Car_number LIKE '%oh%'
以下是相应的代码:
String wantedQuery = "Select * From " + tableName + " WHERE";
PreparedStatement preparedStatement;
try(ResultSet rsColumns = columnsForTable(tableName)) {
String keyword = keywordField.getText();
int limit = 0;
while (rsColumns.next()) {
wantedQuery += " " + rsColumns.getString(1) + " LIKE ? OR";
limit++;
}
wantedQuery = wantedQuery.substring(0, wantedQuery.length()-3);
preparedStatement = con.prepareStatement(wantedQuery);
System.out.println(wantedQuery);
System.out.println("\'%"+keyword+"%\'");
for(int i = 1; i <= limit; i++) {;
preparedStatement.setString(i, "\'%"+keyword+"%\'");
}
}
try(ResultSet rs = preparedStatement.executeQuery()) {
//now get the results from here
ResultSetMetaData metaData = rs.getMetaData();
while (rs.next()) {
System.out.println("Fetching row");
...
}
String wantedQuery=“Select*From”+tableName+“WHERE”;
编制报表编制报表;
try(ResultSet rsColumns=columnsForTable(tableName)){
String关键字=keywordField.getText();
整数极限=0;
while(rsColumns.next()){
wantedQuery+=“”+rsColumns.getString(1)+“类似”或“;
极限++;
}
wantedQuery=wantedQuery.substring(0,wantedQuery.length()-3);
preparedStatement=con.prepareStatement(wantedQuery);
System.out.println(wantedQuery);
System.out.println(“\'%”+关键字+“%\'”);
对于(使用setString()时,int i=1;i)
,JDBC知道它必须是一个字符串,所以它会根据需要在字符串周围加上单引号,您不必自己做。但因为这样做,它实际上是一个不同的字符串,与您预期的不同。作为一个快速猜测,您不需要在此处使用单引号:preparedStatement.setString(i,“\'%”+关键字+“%\”)
@meskobalazs-Hmm就是这样!但它并没有获取所有行。我得到了大约8行,但当直接在数据库上运行查询时,有100多行……不管我之前的评论如何,我忘了使用相同的关键字运行查询,谢谢您的帮助。rsColumns.getString(1)
是正确的,因为这是我从表中获取列名称的地方(“从用户选项卡中选择列名称,其中表名称=?”
)
String wantedQuery = "Select * From " + tableName + " WHERE";
PreparedStatement preparedStatement;
try(ResultSet rsColumns = columnsForTable(tableName)) {
String keyword = keywordField.getText();
int limit = 0;
while (rsColumns.next()) {
wantedQuery += " " + rsColumns.getString(1) + " LIKE ? OR";
limit++;
}
wantedQuery = wantedQuery.substring(0, wantedQuery.length()-3);
preparedStatement = con.prepareStatement(wantedQuery);
System.out.println(wantedQuery);
System.out.println("\'%"+keyword+"%\'");
for(int i = 1; i <= limit; i++) {;
preparedStatement.setString(i, "\'%"+keyword+"%\'");
}
}
try(ResultSet rs = preparedStatement.executeQuery()) {
//now get the results from here
ResultSetMetaData metaData = rs.getMetaData();
while (rs.next()) {
System.out.println("Fetching row");
...
}