傳遞多個值以在java中動態查詢

Question

我試圖在由兩個IN子句組成的SELECT QUERY中傳遞多個值。我想執行以下查詢：

String sql = "select ADDRESS from CDR where APARTY in(?,?,?) intersect select ADDRESS from CDR where BPARTY in (?,?) and USAGETYPE='SMSMT'"; 

如何可以提前使用preparedStatement.setString() .Thanks我傳遞的價值。

Answer 1

這裏是你如何做到這一點：

PreparedStatement pstmt = yourconnexiontoDB.prepareStatement(sql); 
pstmt.setString(1, "your first string"); 
pstmt.setString(2, "your second string"); 

等等的價值觀的其餘部分。

Answer 2

要構建查詢，你可以使用例如StringBuilder例如：

考慮你有兩個名單如下：

List<String> values1 = new ArrayList<>(); 
values1.add("val1_1"); 
values1.add("val1_2"); 
values1.add("val1_3"); 
List<String> values2 = new ArrayList<>(); 
values2.add("val2_1"); 
values2.add("val2_2"); 

現在，我們將構建查詢：

StringBuilder sql = new StringBuilder("select ADDRESS from CDR where APARTY IN("); 

for (int i = 0; i < values1.size(); i++) { 
    sql.append(i == values1.size() - 1 ? "?" : "?,"); 
} 
sql.append(") intersect select ADDRESS from CDR where BPARTY IN ("); 
for (int i = 0; i < values2.size(); i++) { 
    sql.append(i == values2.size() - 1 ? "?" : "?,"); 
} 
sql.append(") and USAGETYPE='SMSMT'"); 
System.out.println(sql); 

直到現在，這可以給你：

select ADDRESS from CDR where APARTY IN(?,?,?) intersect select ADDRESS from CDR where BPARTY IN (?,?) and USAGETYPE='SMSMT' 

現在，你必須使用此查詢中的PreparedStatement：

try (PreparedStatement pstm = connection.prepareStatement(sql)) { 
    int i = 1; 
    for (String s : values1) { 
     pstm.setString(i++, s); 
    } 

    for (String s : values2) { 
     pstm.setString(i++, s); 
    } 
    //...execute the statement and retrieve the results 
}